Ayusmin Panda, Rakshitha H. Ashwath, Chandran Sudakar* and Birabar Ranjit Kumar Nanda*,
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Fabry–Perot Resonances in Rb3Sb2I9 Microcrystals for Optical Sensing Applications
Rhombus-shaped thin Rb3Sb2I9 microcrystals are investigated for their photoluminescence (PL) spectral properties. The spectra show broad self-trapped excitonic emissions with superimposed periodic spectral modulations. Through numerical analysis and an appropriate interference function model, we demonstrate that these spectral modulations arise from Fabry–Perot (FP) interferences, which are rarely observed in halide perovskites. The microcrystal with thin, large flat facets acts as an FP resonating cavity with two parallel mirror surfaces that capture and resonate the incident light throughout the crystal. The FP resonances have been confirmed through 3D full-field finite difference time domain simulations, which reveal variations in electric field eigenmodes with different crystal thicknesses and incident wavelengths. These self-resonating highly sensitive FP microcrystals have potential applications in various lead-free optoelectronic devices, including optical sensors, and as absorption enhancers in perovskite solar cells.
期刊介绍：
ACS Applied Optical Materials is an international and interdisciplinary forum to publish original experimental and theoretical including simulation and modeling research in optical materials complementing the ACS Applied Materials portfolio. With a focus on innovative applications ACS Applied Optical Materials also complements and expands the scope of existing ACS publications that focus on fundamental aspects of the interaction between light and matter in materials science including ACS Photonics Macromolecules Journal of Physical Chemistry C ACS Nano and Nano Letters.The scope of ACS Applied Optical Materials includes high quality research of an applied nature that integrates knowledge in materials science chemistry physics optical science and engineering.
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