Abstract
A narrowband thermal emitter exhibits higher energy efficiency and sensitivity in molecule sensing and other mid-infrared (MIR) spectral range applications compared to a blackbody emitter. Most narrowband thermal emitters involving surface plasmons have a relatively low quality factor (-factor) and require complex fabrication processes. Here we propose a bilayer cavity-enhanced Tamm plasmon (TP) structure with a high/low refractive index bilayer sandwiched between a metal and distributed Bragg reflector (DBR) to achieve an enhanced -factor and maintain higher emittance over a conventional pure DBR-metal TP structure-based emitters. The large optical thickness of the high/low index bilayer cavity aids in increasing the -factor ( for emission) of the cavity resonance. Furthermore, a tunable -factor is achieved ( from 172 to 47 for emission) by incorporating phase-changing material . This easy-to-fabricate and tunable high -factor emitter is competent as a narrowband MIR light source in molecule sensing, typically gas sensing applications.
© 2018 Optical Society of America
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