High-contrast terahertz modulator based on extraordinary transmission through a ring aperture

High-contrast terahertz modulator based on extraordinary transmission through a ring aperture

We demonstrated extraordinary THz transmission through ring apertures on a metal film. Transmission of 60% was obtained with an aperture-to-area ratio of only 1.4%. We show that the high transmission can be suppressed by over 18 dB with a thin layer of free carriers in the silicon substrate undernea...

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Veröffentlicht in:Optics express 2011-12, Vol.19 (27), p.26666-26671
Hauptverfasser: Shu, Jie, Qiu, Ciyuan, Astley, Victoria, Nickel, Daniel, Mittleman, Daniel M, Xu, Qianfan
Format: Artikel
Sprache:eng
Schlagworte:
Equipment Design
Equipment Failure Analysis
Optical Devices
Telecommunications - instrumentation
Terahertz Radiation
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Zusammenfassung:We demonstrated extraordinary THz transmission through ring apertures on a metal film. Transmission of 60% was obtained with an aperture-to-area ratio of only 1.4%. We show that the high transmission can be suppressed by over 18 dB with a thin layer of free carriers in the silicon substrate underneath the metal film. This result suggests that CMOS-compatible terahertz modulators can be built by controlling the carrier density near the aperture.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.19.026666