META 2021, META'12

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Nanoantennas for field enhancement in the mid-IR and THz regime: Applications in SEIRA and cw THz emission
Stefan A Maier

Last modified: 2011-12-05


Metallic antennas with deep sub-wavelength gaps provide a powerful route for field enhancement in the infrared regime of the spectrum, facilitated by the lightning rod effect. In the mid-IR regime, this enables surface enhanced infrared absorption spectroscopy via Fano-type coupling between vibrational molecular states and antenna resonances. A first-principles parameter-free model of this effect will be presented. Furthermore it will be shown that nanoantennas at THz frequencies allow for order-of-magnitude improvements in the cw output of photoconductive photo mixers.