Journal
ACS PHOTONICS
Volume 4, Issue 9, Pages 2228-2234Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b00427
Keywords
near-infrared; microcavity; Tamm plasmon-polariton; charge-transfer state; organic photodetector
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Funding
- Bundesministerium fur Bildung and Forschung [031PT602X]
- Deutsche Forschungsgemeinschaft [SPP1839 (LE747/S3-1)]
- excellence initiative of the German federal and state governments
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Organic spectrometers are attractive for biomedicine and industrial process monitoring but are currently limited in terms of spectral selectivity and the accessible wavelength range. Here, we achieve narrowband enhancement of the below-gap near-infrared response of charge-transfer (CT) excitations in organic photodiodes by introducing them into a high-quality microcavity. The device architecture includes a nonconductive distributed Bragg reflector and thin metal electrodes, leading to the formation of sharp Tamm plasmon-polariton resonances. We demonstrate how to tailor the arising multimode spectra for spectroscopic photodetectors and present efficient single-resonance devices with remarkable line widths below 22 nm, which are partially transparent for visible wavelengths. Taking advantage of the spectrally broad we vary the resonator thickness to provide a proof of concept that benefits from the spectral selectivity of our high-quality microcavities. Finally, utilizing transfer-matrix calculations, we propose further improvements on the cavity architecture toward single-digit line widths.
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