Open AccessMetal sphere array for long wavelength quantum well infrared photodetectors optical coupling
Author(s) -
Xiong Da-Yuan,
Zhifeng Li,
Xiaoshuang Chen,
Ning Li,
Zhen Hong-Lou,
Lu Wei
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.6648
Subject(s) - quantum well infrared photodetector , coupling (piping) , wavelength , photodetector , optics , radius , physics , optoelectronics , quantum , infrared , metal , materials science , quantum well , quantum mechanics , laser , metallurgy , computer security , computer science
A two-dimensional (2D) metal (Copper) sphere array is designed for the optical coupling of 9.5μm long-wavelength quantum well infrared photodetectors (LW-QWIPs). The optical coupling is studied based on Huygens' principle. It was shown that a metal sphere array with 3μm period and 0.9μm radius can reach optimal optical coupling for the 9.5μm LW-QWIPs. The maximal quantum efficiency hits 66%, which is highly superior to the conventional 45° angle coupling. The theoretical results provide detailed guidelines for 2D metal sphere array optical coupling for 9.5μm LW-QWIPs.