Single-peak narrow-bandwidth mid-infrared thermal emitters based on quantum wells and photonic crystals

Inoue, Takuya; De Zoysa, Menaka; Asano, Takashi; Noda, Susumu
May 2013
Applied Physics Letters;5/13/2013, Vol. 102 Issue 19, p191110
Academic Journal
We experimentally demonstrate single-peak narrow-bandwidth thermal emission with a quality factor (Q factor) of more than 100 at a wavelength of 9.1 μm. The emission is significantly suppressed at all other wavelengths. Our emitter is based on an intersubband transition in a multiple quantum well structure combined with a single high-Q resonant mode in a two-dimensional photonic crystal slab, which allows strong light-matter interaction only at a specific wavelength. Strong thermal emission is exhibited only in a limited angular range (∼20°) from the normal direction. Our results have potential applications in bio- and environmental sensors.


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