Dual-channel mid-infrared sensor based on tunable Fabry-Pérot filters for fluid monitoring applications

Rauscher, Markus S.; Schardt, Michael; Köhler, Michael H.; Koch, Alexander W.

doi:10.1016/j.snb.2017.12.032

Cited by 9 publications

(1 citation statement)

References 25 publications

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“…Thus, a distributed Bragg reflector (DBR) side structure (incident light from a DBR) is developed, since the magnitude of absorptivity and Q-factor can be determined by the periods of DBR pairs, which helps reduce the difficulties for fabrication and mechanical stability. However, these multilayer structures provide narrowband emission at fixed peak wavelengths and can hardly be used for multi-compound sensing [23,24]. Alternatively, tunability can be attained by utilizing advanced materials such as phase-changing materials (such as VO x [25] and Ge 2 Sb 2 Te 5 [GST] [26][27][28]) whose permittivity can be tuned by changing their phases.…”

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Tunable narrowband mid-infrared thermal emitter with a bilayer cavity enhanced Tamm plasmon

Zhu

Luo

et al. 2018

Opt. Lett.

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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 (Q-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 Q-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 Q-factor (∼172 for emission) of the cavity resonance. Furthermore, a tunable Q-factor is achieved (Q from 172 to 47 for emission) by incorporating phase-changing material Ge 2 Sb 2 Te 5. This easy-to-fabricate and tunable high Q-factor emitter is competent as a narrowband MIR light source in molecule sensing, typically gas sensing applications.

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confidence: 99%