Abstract

Pyroelectric detectors are desirable for infrared sensing because they operate at room temperature and are easier to fabricate than traditional detectors such as mercury-cadmium-telluride. Unfortunately, they cannot detect specific wavelengths or wavelength bands. Herein, a pyroelectric detector for selective detection in the long-wavelength infrared region will be presented. Pyroelectric aluminum nitride forms a dielectric layer separating a gold plasmonic hole array from a refractory metal, titanium nitride. Infrared radiation incident on the hole array forms a gap plasmon mode whose electric field is confined to the pyroelectric spacer layer. Relaxation of the mode heats the pyroelectric spacer layer, producing a pyroelectric voltage. Using this technique, 18.9 dB of spectral selectivity at λ=9  μm was achieved with a peak responsivity of 1.08  V/W.

© 2017 Optical Society of America

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