Photonic crystal enhanced narrow-band infrared emitters

Pralle, M. U.; Moelders, N.; McNeal, M. P.; Puscasu, I.; Greenwald, A. C.; Daly, J. T.; Johnson, E. A.; George, T.; Choi, D. S.; El-Kady, I.; Biswas, R.
December 2002
Applied Physics Letters;12/16/2002, Vol. 81 Issue 25, p4685
Academic Journal
We have experimentally and theoretically developed a unique thermally stimulated midinfrared source that emits radiation within a narrow range of wavelengths (δλ/λ≤0.2). The emission wavelengths are defined by the periodicity of a metal coated silicon-air photonic crystal etched into the emitter surface. The lattice of the holes in the metal mediate the coupling of light into discrete surface plasmon states. This yields surfaces with spectrally nonuniform infrared reflection properties where over much of the IR 90+% of photons are reflected yet, in a narrow spectral region, 90% absorption is observed. Transfer matrix calculations simulate well the position and strength of the absorption features. This technology will afford tunable infrared emitters with high power in a narrow spectral band that are critical for sensing, spectroscopy, and thermophotovoltaic applications.


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