A normal incident quantum cascade detector enhanced by surface plasmons

A normal incident quantum cascade detector enhanced by surface plasmons

We demonstrate a normal incident quantum cascade detector excited by surface plasmons resonance using an Au two-dimensional hole array integrated on top of the detector absorption region. With normal incidence, the device has a maximal responsivity value of 8.4 mA/W at 160K and can work up to room t...

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Veröffentlicht in:Applied physics letters 2012-04, Vol.100 (18), p.181104-181104-4
Hauptverfasser: Zhai, Shen-Qiang, Liu, Jun-Qi, Liu, Feng-Qi, Wang, Zhan-Guo
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Liu, Jun-Qi
Liu, Feng-Qi
Wang, Zhan-Guo
description We demonstrate a normal incident quantum cascade detector excited by surface plasmons resonance using an Au two-dimensional hole array integrated on top of the detector absorption region. With normal incidence, the device has a maximal responsivity value of 8.4 mA/W at 160K and can work up to room temperature with a responsivity of 1.02 mA/W. Compared with the 45° polished edge coupling device, the two-dimensional hole array can lead to quantum efficiency enhancement at most measured temperatures, and at 140K the quantum efficiency is enhanced most strongly by 69%.
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title A normal incident quantum cascade detector enhanced by surface plasmons
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