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High temperature (up to 400 °C) coupling of infrared (IR) inactive >CCCC< vibration at IR is confirmed. The unusual suppression of the transition is also observed in the absorber structure when the cavity mode strongly overlaps with it. Finally, 14 times better modulation of resonance spectrum is reported by such coupling in absorber configuration that supports thin film interference. The numerical and analytical study of the effect is found to be qualitatively in agreement with the experimental results. The study can set new paths toward more efficient design of spectrally selective thermophotovoltaic energy emitter at mid‐IR and novel mechanism for high temperature sensing on the ubiquitous CMOS platform.
Hasan et al. (2017) studied this question.