Resonant optical cavities are essential components in mid-infrared applications. However, typical film-type cavities require multilayer stacks with a micronthick spacer due to mid-infrared wavelengths, and their performance is limited by narrow frequency tunability and angular sensitivity. We propose and experimentally demonstrate the subwavelength-scale (≈𝜆0/150) resonant nanocavity arrays that enhance the absorption spectrum of the device in the mid-infrared (10–12 microns) via excitation of coupled surface plasmon–phonon polaritons. The proposed metal–insulator–polar dielectric (gold–silicon–silicon carbide) structure supports a guided mode of the coupled surface polaritons in the lateral direction while vertically confining the mid-infrared wave
Kachiraju, Satya R., Nekrashevich, Ivan, Ahmad, Imtiaz, Farooq, Hira, Chang, Long, Kim, Sangsik and Kim, Myoung-Hwan. "Coupled surface plasmon–phonon polariton nanocavity arrays for enhanced mid-infrared absorption" Nanophotonics, 2022. https://doi.org/10.1515/nanoph-2022-0339
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.