Research Papers

Tuning the resonant wavelength of a nanometric bow-tie aperture by altering the relative permittivity of the dielectric substrate

[+] Author Affiliations
Hongfeng Gai

Institute of Optoelectronics Engineering

Ji-a Wang, Qian Tian

Tsinghua University

J. Nanophoton. 1(1), 013555 (November 16, 2007). doi:10.1117/1.2822393
History: Received July 10, 2007; Revised November 14, 2007; Accepted November 15, 2007; November 16, 2007; Online November 16, 2007
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Abstract

A nanometric bow-tie aperture has a resonant wavelength where its power throughput is maximal. The incident wavelength should coincide with the resonant wavelength in order to improve the power throughput. However, sometimes it is impossible to tune the incident wavelength, so the resonant wavelength should be tuned alternatively. In order to implement this goal, the relative permittivity of the dielectric substrate of the bow-tie aperture was altered. Finite-difference time-domain (FDTD) simulation results demonstrated that the resonant wavelength is tuned from 569.7 nm to 694.1 nm when the relative permittivity is altered from 1.0 to 3.5. The advantage of this method is that the resonant wavelength can be tuned continuously if the relative permittivity can be altered continuously.

© 2007 Society of Photo-Optical Instrumentation Engineers

Citation

Hongfeng Gai ; Ji-a Wang and Qian Tian
"Tuning the resonant wavelength of a nanometric bow-tie aperture by altering the relative permittivity of the dielectric substrate", J. Nanophoton. 1(1), 013555 (November 16, 2007). ; http://dx.doi.org/10.1117/1.2822393


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