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This work contributes to the understanding of infrared radiation interaction with matter and its absorption for energy harvesting purposes. By exciting radiative polaritons in thin oxide filmswith polarized infrared radiation, a further evidence is collected that a link exists between radiative polaritons and the heat recovery mechanism hypothesized in previous research. In the voltage transient occurring when the infrared radiation is turned on, the observed time necessary to reach the maximum voltage and the voltage intensity versus angle of incidence exhibit a mismatch when generated by polarized and nonpolarized infrared radiation. The existence of collective charge oscillation modes in the semiconductor-based elements of the thermoelectric power generators supporting the heat recovery mechanism is suggested as the main source of the discrepancy.
Vincent-Johnson, A. J., Masters, A. E., Hu, X., Scarel, G., Excitation of radiative polaritons by polarized broadband infrared radiation in thin oxide films deposited by atomic layer deposition. Journal of Vacuum Science & Technology A, 31, 01A111 (2013), DOI:http://dx.doi.org/10.1116/1.4759442