Multispectral infrared detection using plasmon-assisted cavities

R. V. Shenoi; J. Rosenberg; T. E Vandervelde; O. J. Painter; S. Krishna

doi:10.1117/12.818982

7 May 2009 Multispectral infrared detection using plasmon-assisted cavities

R. V. Shenoi, J. Rosenberg, T. E Vandervelde, O. J. Painter, S. Krishna

Proceedings Volume 7298, Infrared Technology and Applications XXXV; 729808 (2009) https://doi.org/10.1117/12.818982
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

μWe report the demonstration of multi-spectral quantum dots-in-a-well infrared photo-detectors through the coupling of incident light to resonant modes of surface plasmons. The integration of a surface plasmon assisted cavity with the detector results in shifting the peak wavelength of absorption of the detector to that of the resonant wavelength of the cavity. The cavity consists of a square lattice structure with square holes in it. A wavelength tuning of 8.5 to 9 μm was observed, by changing the pitch of the fabricated pattern forming the cavity. Polarization sensitive detectors can be fabricated by breaking the symmetry of the lattice. This is achieved by stretching the lattice constants along the x and y directions. A DWELL detector with resonant frequency at 6.8 μm where the response of the 0 ° polarization is twice as strong as the 90° polarization is reported. This technique, in principle, is detector agnostic and shows promise in fabrication of multi-spectral focal plane arrays (FPA).

Citation Download Citation

R. V. Shenoi, J. Rosenberg, T. E Vandervelde, O. J. Painter, and S. Krishna "Multispectral infrared detection using plasmon-assisted cavities", Proc. SPIE 7298, Infrared Technology and Applications XXXV, 729808 (7 May 2009); https://doi.org/10.1117/12.818982

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KEYWORDS

Sensors

Polarization

Metals

Plasmons

Infrared radiation

Long wavelength infrared

Quantum dots

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