Open AccessEnhanced and suppressed infrared transmission through germanium subwavelength arrays
Author(s) -
Wei Dong,
Toru Hirohata,
Kazutoshi Nakajima,
Xiaoping Wang
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.028513
Subject(s) - germanium , extraordinary optical transmission , optics , materials science , surface plasmon , infrared , transmission (telecommunications) , wavelength , plasmon , finite difference time domain method , photonic crystal , optoelectronics , photonics , surface plasmon polariton , physics , silicon , telecommunications , computer science
We have studied the zero-order transmission of periodic germanium (Ge) subwavelength arrays in an infrared range by using finite-difference time-domain simulations. A special wavelength-selective peak in a triangular hole array of Ge film is observed with an enhanced transmission accompanied by a drastic suppression nearby, which cannot be found in a one-dimensional Ge subwavelength array and is different from the extraordinary transmission related to surface plasmons in a metal film. The electromagnetic field is found to be concentrated on both surfaces of the Ge film at this peak. The unique transmission is verified through measurements on fabricated samples and is interpreted using the photonic band structure.