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Applied Physics Letters / Volume 97 / Issue 5 / LASERS, OPTICS, AND OPTOELECTRONICS

Appl. Phys. Lett. 97, 051110 (2010); http://dx.doi.org/10.1063/1.3474614 (3 pages)

Terahertz photonic band gap for the transverse-magnetic modes formed by using a planar waveguide structure with a photonic crystal electrode

Y. Sakasegawa, T. Ihara, and K. Hirakawa

Institute of Industrial Science and Institute for Nano Quantum Information Electronics, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan

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(Received 11 June 2010; accepted 12 July 2010; published online 5 August 2010)

We have investigated the terahertz (THz) emission from a semiconductor superlattice placed in a waveguide structure with a photonic crystal surface electrode of a honeycomb lattice pattern. For uniformly applying bias voltages, we inserted a semitransparent Ti film between the superlattice layer and the photonic crystal electrode. It is found that optimization of the sheet resistivity of the Ti layer is crucial to suppress the coupling between the waveguide mode and the surface leaky mode and obtain a clear photonic band gap. When the Ti layer was 40 nm, a large extinction ratio of ∼ 120 in the THz emission intensity was obtained at the midgap frequency around 1.7 THz.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

optical lattices, optical multilayers, photonic band gap, photonic crystals, superlattices

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3474614

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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    N. Sekine, Y. Shimada, and K. Hirakawa, Appl. Phys. Lett. 83, 4794 (2003)APPLAB000083000023004794000001.


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