Poster session I
Design, Fabrication and Characterization of Terahertz Reflectarrays Based on a Silicon Substrate
H. Hasani (1), M. Tamagnone (1), S. Capdevila (1), C. Moldovan (1), A. M. Ionescu (1), C. Peixeiro (2), J. R. Mosig (1), A. Skrivervik (1)
(1)Ecole polytechnique federale de Lausanne (EPFL) (Switzerland), (2)University of Lisbon (Portugal) We present the design, fabrication and measurement of terahertz reflectarray surfaces realized by metallic patterns fabricated on a back-metallized thin silicon substrate. The device is designed to steer an incident beam towards a predefined direction. An excellent agreement is found between measurements and expected performances.
Stretchable and Transparent THz Reflectarrays Based on PDMS
P. Romano, M. Tamagnone, S. Capdevila, S. Rosset, H. Shea, J. R. Mosig
Ecole polytechnique federale de Lausanne (EPFL) (Switzerland) We present the design, implementation and preliminary characterization of terahertz reflectarrays based on polydimethylsiloxane (PDMS). The metal patterns are created with e-beam metal evaporation using a shadow mask while the ground plane is implemented using ion implantation on the opposite side of the thin PDMS membrane. Measurements demonstrate good performance in terms of losses and beam deflection, in agreement with numerical simulations.
Giant magnetodielectric metamaterial
Ji Zhou, Ke Bi, Xiaoming Liu
Tsinghua University (China) We demonstrate a giant magnetodielectric effect at GHz region in a metamaterial based on ferrite unit cells. The effect is derived from a couple of ferromagnetic resonance and Mie resonance in ferrite unit cells. Experimental results show that the effective permittivity of the metamaterial can be tuned by the applied magnetic field, and a giant magnetodielectric effect at microwave range, has been obtained.
Antenna Array Bandwidth Enchancement using Polymeric Nanocomposite Substrate
Wan Asilah W. Muhamad (1), Razali Ngah (1), Mohd Faizal Jamlos (2), Ping Jack Soh (2)
(1)Universiti Teknologi Malaysia (Malaysia), (2)Universiti Malaysia Perlis (Malaysia) A new antenna substrate made from Polydimethylsiloxane (PDMS) and magneto-dielectric (PDMS-Fe3O4) polymeric nanocomposite is presented. This substrate enhances antenna performance in terms of lower reflection coefficient, wider bandwidth and size compactness. The 4x2 antenna array operating at 2.6 GHz is water resistant as the radiating structure is fully embedded inside the substrate. Simulated and measured S11 and radiation pattern agrees well, while a bandwidth increment of 242.25 percent is observed relative to a similar FR4 antenna.
Polymer (PDMS-Fe3O4) Magneto-Dielectric Substrate for a MIMO Antenna Array
Abdulrahman S. M. Alqadami, Mohd Faizal Jamlos, Ping Jack Soh
Universiti Malaysia Perlis - UniMAP (Malaysia) This paper presents the design of a 2 x 4 multiple input multiple output antenna array fabricated on a nanocomposite polymer substrate. Iron oxide (Fe3O4) nanoparticles and polydimethylsiloxane (PDMS) are used to form this polymer magneto-dielectric substrate layer. The results of the proposed antennas showed up to 41 percent enhancement in terms of bandwidth, 9.95 dB gain and 57 percent efficiency which indicating its suitability for RF/microwave applications
Terahertz magnetic response of rare earth orthoferrites
Xiaojian Fu, Tie Jun Cui
Southeast University (China) For most materials, the magnetism rapidly declines above microwave frequencies, and the magnetic permeability is usually taken as unit in the optical regime. The so-called metamaterials can achieve high frequency magnetic response by employing the artificially designed magnetic resonance. However, the working frequencies of metamaterials depend on the periodic structure and may not be easy to tune. In this study, we investigate the intrinsic magnetic properties of rare earth orthoferrites, which may have potential application in tunable terahertz metamaterials.
Negative Refraction and Spatial Dispersion in Metamaterials
John S. Derov, Daniel Jackson
Air Force Research Laboratory (USA) Both negative refraction and spatial dispersion has been observed in metamaterials. A combination of simulated and measured data is used to show the relationship between the negative refraction and spatial dispersion in a split-ring/wire-post Metamaterial. When the spatial modes are excited, three waves propagate through the metamaterial, incident, longitudinal, and transverse waves. The relationship between spatial dispersion and negative refraction along with excitation and control of the spatial modes in a metamaterial will be presented and discussed.
Slowing microwaves with deeply subwavelength 3D printed metamaterial waveguides
Nadege Kaina (1), Alexandre Causier (2), Mathias Fink (1), Thomas Berthelot (2), Geoffroy Lerosey (1)
(1)ESPCI ParisTech (France), (2)CEA Saclay (France) We study resonant wire media scaled at very subwavelength scales. We show that introducing local defects permits to guide the waves with a transverse confinement of the order of one period in any direction, independently of the medium's spatial organization. We prove that the propagation within these waveguides exhibit very low group velocities that can be tuned by modifying the geometrical parameters of the neighboring wires. We present simulation and experimental results of 3D printed polymer copper coated waveguides.
Engineering of dark modes through symmetry matching
S. N. Burokur, Anatole Lupu, Andre de Lustrac
Paris Sud University (France) The aim of the present contribution is to show that in contrast to the classical indirect excitation through hybridization mechanism leading to EIT phenomenon and maximum in transmission, our proposed direct dark mode excitation manifests as a sharp maximum in reflection and minimum in transmission. We discuss the advantages related to this operation mode and detail the essential of the underlying excitation mechanism which is not based on modes hybridization.
Phase demodulation based on zero-index metamaterials
Yue Qin, Yongxin Wang, Ping Xu
Soochow University (China) We theoretically demonstrate that zero-index metamaterials (ZIM) junction with three ports can realize the function of optical interferometer in optical phase demodulation. When the junction is made up of epsilon-near-zero (ENZ) material, performance of the proposed structure becomes deteriorated because of impedance mismatch, which results in distortion and intensity decrease of final demodulated wave. To improve performances, three approaches including narrowing the area of ENZ junction, adding proper defect and using anisotropy ENZ junction are presented.
Collecting and guiding electromagnetic waves via one-dimensional gradient-index structures in silicon photonics
HongChen Chu, Jie Luo, Yun Lai
Soochow University (China) We propose to collect and guide electromagnetic waves in the vertical direction of incidence by using the 1D counterpart of meta-surfaces: one-dimensional gradient-index structures. For guided modes confined in a silicon plate, we find it possible to draw wave energy into the vertical direction with nearly 100 percent efficiency. Through theoretical analysis and numerical simulations, we designed the gradient structure and proved the function. Our work demonstrates an example of controlling electromagnetic waves in the sub-wavelength scale with one-dimensional gradient-index structures.
Zero-n Bandgap with Photonic Crystal Superlattices Both For Negative and Positive Refraction
Serdar Kocaman, Ekin Karaca
Middle East Technical University (Turkey) We demonstrate numerically that superlattices with photonic crystals for both negative and positive refraction sections can be designed in order to get zeroth order bandgap in the near infrared region and fine tuning can be obtained with the coupling radius between the layers.
Reconfigurable Metamaterial Microwave Filters using Moire Interference
Jae-Hyung Han, Inbo Kim, Jung-Wan Ryu, Muhan Choi
Kyungpook National University (Korea) We report the numerical and experimental results of transmission property of electromagnetic waves (EM waves) incident to a reconfigurable metamaterial based on Moire interference. The Moire pattern is created by superimposing two transparent layers each of which has a periodic metallic pattern. The numerical and experimental results show that the transmission of electromagnetic wave is modulated up to about 90 percent at 11 Gigahertz.
Noble metal nanoparticles coated with novel aminothioalkil ligands for synthesis of covalently bonded polymer-nanoparticles composites.
Michalina Iwan, Tomasz Andryszewski, Marcin Fialkowski
Polish Academy of Sciences (Poland) We present a facile and potentially general approach to the synthesis of nanocomposite in which noble metal nanoparticles (NP) are covalently bonded to a polymer matrix. In this approach, the NPs are functionalized with novel aminothioalkil ligands that are capable to bind chemically to a wide range of polymers possessing carbonyl groups or hydroxyl groups that can be oxidized into carbonyl groups.
Real-time continuous-wave amplitude terahertz modulation system based on active metamaterials
Saroj Rout, Sameer Sonkusale
Tufts University (USA) We demonstrate a real-time terahertz modulation system at 448 GHz using a metamaterial terahertz modulator and a continuous-wave terahertz source based on photo-mixing of two tunable distributed feedback lasers. Another photo-mixer followed by a lock-in I/Q detection of the cw spectrometer serves as a complex receiver of amplitude modulation used to determine the spectral transmitivity of the modulator.
One-dimensional metamaterial photonic crystal with defects, a study of the surfaces modes
Jaime Perez-Rodriguez, Martha Palomino-Ovando, Gregorio H. Cocoletzi
Benemerita Universidad Autonoma de Puebla FCFM (Mexico) We explore the coupling of the surface plasmons with modes associated to the defect in one-dimensional photonic crystals which are composed by alternating layers of a left hand material and a dielectric. This photonic crystal has a defect in the middle of its structure which is obtained by varying the dielectric layer thickness. The presence of the defect generates an electric field amplification in the left hand material which improves the conditions for propagation of surface modes.
Specific Absorption Rate Reduction of Multi-standard Mobile Antenna with Double-Negative Metamaterial
Touhidul Alam, M. R. I. Faruque, M. T. Islam
Universiti Kebangsaan Malaysia (Malaysia) This paper presents a printed multi-standard mobile wireless antenna loaded with double-negative metamaterial that covers the operating frequency of 1.66 GHz to3.95 GHz and 4.45 GHz to 5.73 GHz. The antenna is assimilated with a semicircular shape radiating patch, metamaterial loaded ground plane and microstrip feed line. The perceptible novelties exhibited in this proposed antenna is reduction of specific absorption rate (SAR) with metamaterial loaded ground plane.
Design and Implementation of Waveguide Bandpass Filter Using Complementary Metaresonator
Tanveer Ul Haq (1), Muhammad Faisal Khan (1), Omar Siddiqui (2)
(1)Ghulam Ishaq Khan Institute (Pakistan), (2)Taibah University (Saudi Arabia) Passband filter for rectangular waveguide is designed using complementary symmetric split ring resonator (CSSRR). By varying different geometrical parameters of CSSRR, the passband frequency and bandwidth can be varied. Effect of design parameter on quality factor of filter is also calculated. By appropriate choice of CSSRR geometrical parameters, a filter is proposed which gives passband of 2 GHz in ku band.
High-Contrast Nanoparticle Sensing using a Hyperbolic Metamaterial
Wenqi Zhu, Ting Xu, Amit Agrawal, Henri Lezec
University of Maryland (USA) Using planar hyperbolic metamaterials composed of alternating layers of metal (Ag) and dielectric (SiO2), we demonstrate a transmission device for nanoparticle sensing that exhibits extremely high optical contrast. Due to its high sensitivity to nanoparticles in deep-subwavelength proximity to a surface, achieved without the use of cumbersome dark-field optics, this HMM-based device hints at promising applications in bio-chemical sensing, particle tracking and contamination analysis.
Metasurface based micro-plasma device
Shiva Piltan, Ebrahim Forati, Dan Sievenpiper
University of California San Diego (USA) A metasurface based micro-plasma device is proposed taking advantage of the inherent resonance of the surface. The structure combines the DC and laser induced discharges and reduces both the required DC voltage and laser power to ignite the plasma.
A Wideband Double-Negative Metamaterial Based on Framed Crosses
Anatolii Konovalenko (1), Jorge Reyes-Avendano (2), Felipe Perez-Rodriguez (1)
(1)Benemerita Universidad Autonoma de Puebla (Mexico), (2)Escuela de Ingenieria y Tecnologias de Informacion (Mexico) A new type of negative index metamaterial composed of metal framed crosses is proposed. The new metamaterial design leads to a relatively-wide band of simultaneously negative permittivity and permeability within the microwave range.
Dual Resonant Polarization-Independent and Wide Angle Metamaterial Absorber in X-Band Frequency
Osman Ayop, M. K. A. Rahim, N. Murad, N. Samsuri
Universiti Teknologi Malaysia (Malaysia) This paper presents the dual resonant polarization-independent metamaterial absorber with wide operating angle in X-band frequency. The resonating elements are designed using the two circular rings structure with different radius. The resonating elements are printed on the top and bottom surface of FR4 substrate, while at the middle layer, a full copper layer is placed. The proposed structure achieves high absorbance, which is 96.41 percent and 93.61 percent at resonances for normal incident angle. The operating angle is nearly 70o.
VCO based on Composite Right/Left-Handed Metamaterial Transmission Lines loaded with RTD
H. J. El-Khozondar (1), M. Abu-Marasa (1), R. J. El-Khozondar (2), M. Elbahri (3), S. Zouhdi (4)
(1)Islamic University of Gaza (Palestine), (2)Al-Aqsa University (Palestine), (3)University of Kiel (Germany), (4)Paris Sud University (France) This paper proposes a voltage control oscillator (VCO) at high frequency consists of nonlinear composite right/left-handed transmission line (CRLH-TL) loaded with Resonant Tunneling Diode (RTD). The system has equals input and output resistance. In this work, we used OrCAD and ADS software to analyze the proposed circuit. The VCO capable of generating oscillation at frequency equals 14.4 GHz.
Metamaterials lens design for microwave
Tamelia Ali (1), Igor Bendoym (2), Steve Kacenjar (3), Andrii Golovin (1), David Crouse (1)
(1)City College of New York (USA), (2)Pheobus Optoelectronics (USA), (3)Lockheed Martin Corp. (USA) The development of flat, low profile, and light weight metamaterial lens for microwave allows for small phase error, wide frequency band, wide angle scanning, and true-time delay beam forming. This lens design is promising for applications in remote sensing, THz imaging, and adaptive antennas in microwave regime. In this work, the comparison between the beam shaping of metamaterial lenses and the diffraction limited optical systems in extended bandwidth is provided both analytically and numerically.
Mie-resonance-mediated light trapping in Si nanocone arrays
Eunah Kim (1), Yunae Cho (1), Dong-Wook Kim (1), Kwang-Tae Park (2), Jun-Hyuk Choi (2), Seung-Hyuk Lim (3), Yong-Hoon Cho (3), Yoon-Ho Nam (4), Jung-Ho Lee (4)
(1)Ewha Womans University (Korea), (2)Korea Institute of Machinery and Materials (Korea), (3)KAIST (Korea), (4)Hanyang University (Korea) We investigated optical characteristics of Si nanocone (NC) arrays, of which optical reflectance was less than 10 percent in the visible wavelength range. Comparison of the experimental and simulated optical reflectance spectra clearly suggested the Mie resonance played a key role in the remarkable AR effects. The photoluminescence intensity of the NC arrays was an order of magnitude larger than that of a planar wafer, also supporting the Mie-resonance-mediated strongly concentrated light at the surface.
Efficient collection of incoming photons and photo-generated carriers in Si nanostructure array solar cells
Yunae Cho (1), Eunah Kim (1), Dong-Wook Kim (1), Joondong Kim (2)
(1)Ewha Womans University (Korea), (2)Incheon National University (Korea) Si nanostructure array enables much improved broadband and omnidirectional optical absorption, compared with conventional light trapping strategies. We achieved a very high photocurrent density of 36.94 mAcm-2 from our nanoconical frustum array crystalline Si (c-Si) solar cells. Optical simulation studies showed that the expected photocurrent nanostructured cells could slightly exceed the Lambertian limit with the help of remarkable antireflection (AR) effects and efficient carrier collection capability.
Hussein Esfahlani, Sami Karkar, Herve Lissek
Ecole Polytechnique Federale de Lausanne (Switzerland) Metasurfaces have gained fame for their ability to control the transmitted and reflected phase front of waves. Here, we introduce a reflector-type acoustic metasurface designed in such a way to control the phase front of reflected sound waves. The proposed structure can be considered an acoustic counterpart of the electromagnetic reflectarray antenna. This structure is very thin, and possesses sub-wavelength unit-cells.
Design of a flat metamaterial lens operating at 60 GHz
Jason Pereira (1), Shimul Saha (2), Helena Cano-Garcia (3), Efthymios Kallos (4)
(1)Metamaterial Technologies Inc. (Canada), (2)Metamaterial Technologies Inc. (United Kingdom), (3)Medical Wireless Sensing Limited (United Kingdom), (4)Medical Wireless Sensing Limited (Canada) This paper presents the design and simulation results of a flat, focusing lens consisting of three metamaterial layers and operating in the V-band at 60 GHz. It is approximately a twelfth of the thickness of conventional dielectric hyperbolic lenses. Its simulated focusing performance was compared to a conventional dielectric lens and it was found to perform similarly.
Broadband perfect absorption of elastic waves by ultra-thin films composed of damping elastic metamaterials
Yuetao Duan (1), Jie Luo (1), Guanghao Wang (1), Zhihong Hang (1), Bo Hou (1), Ping Sheng (2), Jensen Li (3), Yun Lai (1)
(1)Soochow University (China), (2)Hong Kong University of Science and Technology (Hong Kong), (3)University of Birmingham (United Kingdom) We find that when the film is of a large value of almost pure imaginary mass density and a free space boundary, or of a small value of almost pure imaginary modulus and a hard wall boundary, perfect absorption can be achieved. We design elastic metamaterials with large damping so as to achieve such effective media and therefore provide a practical method to realize broadband perfect absorption of elastic waves in ultra-thin films.
Ultra-transparent 1D Photonic Crystals
Zhong Q. Yao, Jie Luo, Yun Lai
Soochow University (China) We propose to realize ultra-transparent 1D photonic crystals. Here, by ultra-transparency we mean that the transmission through the photonic crystals is unity, i.e. transparent, for a large range of incident angles. We provide theory as well as numerical verifications. Such a class of 1D photonic mediaopens up many new possibilities such as cloaking.
Wavefront Modulation with Transmissive and Reflective Acoustic Metasurfaces
Wenqi Wang, Yangbo Xie, Adam Konneker, Bogdan-Ioan Popa, Steven Cummer
Duke University (USA) Acoustic metasurfaces are devices that exhibit exotic wave manipulating properties with thin planar profiles. Building on our previous works of transmissive acoustic lenses and metasurfaces, we present here several reflective metasurfaces based on an expanded library of labyrinthine acoustic metamaterials. We demonstrate that by engineering the surface acoustic impedances, the reflected acoustic wavefront can be tailored with extended degree of freedom.
Phase and Group Velocities in Metamaterials
Taibah University (Saudi Arabia) The electromagnetic properties are usually studied by constructing dispersion surfaces and Brillioun diagrams. Although these are useful tools, the time-domain picture is needed to complete the understanding of the dispersion behavior. In this paper, the electromagnetic behavior of different metamaterials is explained by means of phase and velocity surfaces and time domain wave propagation simulations. The dispersion behavior can also be understood by looking at the relation between the phase and group velocities
Reflectance spectra comparisons of different multilayered plasmonic nanoantenna arrays
Semih Korkmaz, Ekin Aslan, Sabri Kaya, Mustafa Turkmen
Erciyes University (Turkey) Metal - dielectric - metal (MDM) based plasmonic nanostructures simultaneously minimizing the reflectance with perfect impedance matching and eliminating the transmittance by maximizing material losses typically consist of three functional layers that comprise a dielectric layer sandwiched between two metal layers. In this study, we proposed different plasmonic nanostructures operating in mid infrared regime. We investigated the spectral response of these plasmonic nanostructures by using finite difference time domain (FDTD) method.
One-Way Dirac Cones and Edge States in 2D Photonic Crystals with Broken Parity and Time-Reversal Symmetries
Xiang Ni (1), Steven Munoz (2), Alexander A. Lisyansky (1), Alexander B. Khanikaev (1)
(1)Queens College-The City University of New York (USA), (2)The Graduate Center -The City University of New York (USA) Bulk spectrum and edge modes of a magnetic photonic crystal with broken TR and PS are studied. It is shown that for specific values of parameters defining the strength of the symmetry reduction the bulk modes exhibit a peculiar one-way Dirac-like dispersion. The domain wall formed by two crystals with reversed symmetry reduction parameters supports an edge mode which coexists with the one-way bulk Dirac regime.
Enhanced Sound Pressure Level by High Effective Index of Refraction and Impedance in an Acoustic Metamaterial Cavity
Kyungjun Song (1), Jedo Kim (2)
(1)Korea Institute of Machinery and Materials (Korea), (2)Pukyong National University (Korea) We design and experimentally demonstrate an acoustic metamaterial localization cavity which is used for sound pressure level (SPL) gain using double coiled up space like structures. This unique behavior occurs within a subwavelength cavity that is 1/10th of the wavelength of the incident acoustic wave, which provides up to a 13 dB SPL gain. We show that the amplification results from the Fabry-Perot resonance of the cavity exhibiting simultaneously high effective refractive index and effective impedance.
Millimeter-sized ultrasmooth single-crystalline gold flakes for large-area plasmonics
You-Xin Huang, Kel-Meng See, Jer-Shing Huang
National Tsing Hua University (Taiwan) In this work, we present a new synthesizing method of ultra-large millimeter-sized single-crystalline gold flakes for large-area plasmonics.
Thermo-optical properties of polydimethylsiloxane (PDMS) doped with metallic nanoparticles
J. F. Algorri (1), B. Garcia-Camara (1), D. Podereux (2), R. Vergaz (1), V. Urruchi (1), J. M. Sanchez-Pena (1)
(1)Carlos III University of Madrid (Spain), (2)Universidad Politecnica de Madrid (Spain) The thermo-optical response of polydimethylsiloxane (PDMS) doped with metallic nanoparticles is theoretically studied. The temperature dependence of the effective refractive index of the mixture has been analyzed through the spectral evolution of the output power ratio of a beam crossing a sample. Both the nanoparticle size and the concentration effects have been analyzed to design a potential temperature sensor.
Room Temperature Ferromagnetism in Antiferromagnetic Cobalt Oxide Nanoctahedra
Nerio Fontaina-Troitino (1), Benito Rodriguez-Gonzalez (1), Michael Farle (2), Veronica Salgueirino (1)
(1)Universidade de Vigo (Spain), (2)Universitat Duisburg-Essen (Germany) Cobalt oxide octahedra were synthesized by thermal decomposition. Each octahedron-shaped nanoparticle consists of an antiferromagnetic CoO core enclosed by eight 111 facets interfaced to a thin surface layer of strained Co3O4. The nearly perfectly octahedral shaped particles with 20, 40 and 85 nm edge length show a weak room temperature ferromagnetism which can be attributed to ferromagnetic correlations appearing due to strained lattice configurations at the CoO/Co3O4 interface.
Landau damping of electromagnetic transport via dielectric-metal superlattices
Alejandro Paredes-Juarez, Denis Iakushev, Benito Flores-Desirena, Nykolay Makarov, Felipe Perez-Rodriguez
Benemerita Universidad Autonoma de Puebla (Mexico) We discuss the propagation of plane electromagnetic waves through a one-dimensional periodic array of bilayers with metal inclusions. We show that the nonlocality of metal conductivity gives rise to the emergence of the collisionless Landau damping, which considerably alters the photonic band structure of the array and its transmission within the THz and near-infrared frequency range.
Effect of the material thicknesses on the optical properties of fractal perfect absorber
Ekin Aslan, Sabri Kaya, Mustafa Turkmen
Erciyes University (Turkey) The effects of material thicknesses on the spectral responses of plasmonic absorber nanoantenna arrays based square fractal nanoholes are analyzed. Quality factor of the structure is also calculated. Absorbance spectra of the structure are presented versus different thicknesses for patterned layer and dielectric spacer. Due to its tunable resonance in mid-infrared regime to maintain large amplitudes and high Q factor features the proposed structure can be a good candidate for biosensing applications with the use of infrared spectroscopy techniques.