14 September 2018 Coherent perfect absorption in one-port devices with wedged organic thin-film absorbers
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We are using organic small molecules as absorbing material to investigate coherent perfect absorption in layered thin-film structures. Therefore we realize strongly asymmetric resonator structures with a high optical quality dielectric distributed Bragg reflector and thermally evaporated wedged organic materials on top. We investigate the optical properties of these structures systematically by selective optical pumping and probing of the structure. By shifting the samples along the wedge, we demonstrate how relations of phase and amplitude of all waves can be tuned to achieve coherent perfect absorption. Thus almost all incident radiation dissipates in the thin organic absorbing layer. Furthermore, we show how these wedged structures on a high-quality reflective dielectric mirror can be used to determine optical dispersion relations of absorbing materials in a broad spectral range. This novel approach does not require any specific a priori knowledge on the absorbing film.
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Tony Henseleit, Markas Sudzius, Hartmut Fröb, and Karl Leo "Coherent perfect absorption in one-port devices with wedged organic thin-film absorbers", Proc. SPIE 10736, Organic Light Emitting Materials and Devices XXII, 107361T (14 September 2018); doi: 10.1117/12.2321082; https://doi.org/10.1117/12.2321082

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