Film-coupled log-periodic optical antennas for near-infrared light absorption

Yuzhou Tian; Ding Zhao; Qiang Li; Min Qiu

doi:10.1117/12.2075318

13 November 2014 Film-coupled log-periodic optical antennas for near-infrared light absorption

Yuzhou Tian, Ding Zhao, Qiang Li, Min Qiu

Proceedings Volume 9278, Plasmonics; 92781B (2014) https://doi.org/10.1117/12.2075318
Event: SPIE/COS Photonics Asia, 2014, Beijing, China

Abstract

Absorption properties of film-coupled log-periodic optical antennas in the near-infrared region are numerically investigated. The maximum absorption for TE and TM polarizations at normal incidence reach to 95% and 93%, respectively, and the optimal absorption of around 90% can be simultaneously obtained for both cases. It is shown that the main absorption peak is independent to light polarizations at normal incidence. Moreover, the log-periodic antenna-assisted absorption represents district polarization selectivity at high-order resonances. For oblique incidence, only the incident light of specific wavelengths within a narrow incidence angle can be almost entirely trapped inside the absorber, indicating special direction and wavelength selectivity of the absorber. All these features would lead to potential applications in photovoltaic technology, sensing, etc.

Citation Download Citation

Yuzhou Tian, Ding Zhao, Qiang Li, and Min Qiu "Film-coupled log-periodic optical antennas for near-infrared light absorption", Proc. SPIE 9278, Plasmonics, 92781B (13 November 2014); https://doi.org/10.1117/12.2075318

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