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- Kim, Dai-Sik
- Nano Optics Group
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Large enhancement of nonlinear terahertz absorption in intrinsic GaAs by plasmonic nano antennas
- Author(s)
- Jeong, Young-Gyun, Paul, Michael J., Kim, Seung-Hyun, Yee, Ki-Ju, Kim, Dai-Sik, Lee, Yun-Shik
- Issued Date
- 2013-10
- Citation
- APPLIED PHYSICS LETTERS, v.103, no.17, pp.171109
- Abstract
- We demonstrate remarkably strong nonlinear terahertz (THz) effects in an intrinsic GaAs wafer patterned with a nanometer-width slot antenna array. The antenna near-field reaches 20 MV/cm due to the huge field enhancement in the plasmonic nano-structure (field enhancement factor, alpha congruent to 50). The THz fields are strong enough to generate high density free carriers (N-e > 10(17) cm(-3)) via interband excitations associated with impact ionizations and thus to induce large absorption of the THz radiation (>35%). The nonlinear THz interactions take place in the confined region of nanometer-scale layer adjacent to the antenna.
- Publisher
- AMER INST PHYSICS
- ISSN
- 0003-6951
- Keyword
- BAND-STRUCTURE, GENERATION, TRANSPORT
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