CST – Computer Simulation Technology

A monolithically integrated plasmonic infrared quantum dot camera
Sang Jun Lee, Zahyun Ku, Ajit Barve, John Montoya, Woo-Yong Jang, S. R. J. Brueck, Mani Sundaram, Axel Reisinger, Sanjay Krishna, Sam Kyu Noh
Nature Communications
19 April 2011
In the past few years, there has been increasing interest in surface plasmon-polaritons, as a result of the strong near-field enhancement of the electric fields at a metal–dielectric interface. Here we show the first demonstration of a monolithically integrated plasmonic focal plane array (FPA) in the mid-infrared region, using a metal with a two-dimensional hole array on top of an intersubband quantum-dots-in-a-well (DWELL) heterostructure FPA coupled to a read-out integrated circuit. Excellent infrared imagery was obtained with over a 160% increase in the ratio of the signal voltage (Vs) to the noise voltage (Vn) of the DWELL camera at the resonant wavelength of ? = 6.1 µm. This demonstration paves the way for the development of a new generation of pixel-level spectropolarimetric imagers, which will enable bio-inspired (for example, colour vision) infrared sensors with enhanced detectivity (D*) or higher operating temperatures.

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