Narrowband thermal emission from Tamm plasmons of a modified distributed Bragg reflector
Zhiyu Wang, J. Kenji Clark, Ya-Lun Ho, Jean-Jacques Delaunay
Applied Physics Letters
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.
This work was supported through Japan Society for the Promotion of Science (JSPS) KAKENHI (Grant Nos. 17K18867 and 17H03229), JSPS CREST (JPMJCR17I3), and JSPS Core-to-Core Program (Advanced Research Networks type A), Japan. We would like to extend our grateful appreciation to Ms. Ayako Mizushima and Dr. Eric Lebrasseur from the University of Tokyo for important technical support.
FTIR - Portable, Tamm plasmons, Bragg reflector