Narrowband thermal emission from Tamm plasmons of a modified distributed Bragg reflector
Tamm plasmons (TPs), which exist at the interface between a metallic film and a distributed Bragg reflector (DBR), can be thermally excited and then out-coupled as thermal radiation, providing a means to realize easy-to-fabricate and wavelength-selective infrared emitters. A modified TP structure co...
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Veröffentlicht in: | Applied physics letters 2018-10, Vol.113 (16) |
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Sprache: | eng |
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Zusammenfassung: | Tamm plasmons (TPs), which exist at the interface between a metallic film and a distributed Bragg reflector (DBR), can be thermally excited and then out-coupled as thermal radiation, providing a means to realize easy-to-fabricate and wavelength-selective infrared emitters. A modified TP structure consisting of a DBR having a thick layer adjacent to the metallic film is proposed and high-intensity and narrowband thermal emission of the structure is demonstrated. The modified TP structure sustains a higher order TP mode with a higher quality factor (Q-factor) emittance peak than a standard TP structure. The measurement of the emission at 150 °C of the proposed TP structure reveals an emittance peak with a maximum value of 0.94, a background of 0.01, and a Q-factor of 48 at a wavelength around 5 μm. Moreover, a wide range of emission wavelengths (from 4.4 μm to 5.7 μm) is experimentally realized by adjusting the last DBR-layer thickness, thus demonstrating a fine selection of the emission peak wavelength. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.5048950 |