Flexible and self-powered photodetectors (PDs) are highly desirable for applications in image sensing, smart building, and optical communications. In this paper, a self-powered and flexible PD based on the methylammonium lead iodide (CH NH PBI ) perovskite is demonstrated. Such a self-powered PD can operate even with irregular motion such as human finger tapping, which enables it to work without a bulky external power source. In addition, with high-quality CH NH PBI perovskite thin film fabricated with solvent engineering, the PD exhibits an impressive detectivity of 1.22 × 10 Jones. In the self-powered voltage detection mode, it achieves a large responsivity of up to 79.4 V mW cm and a voltage response of up to ≈90%. Moreover, as the PD is made of flexible and transparent polymer films, it can operate under bending and functions at 360 ° of illumination. As a result, the self-powered, flexible, 360 ° omnidirectional perovskite PD, featuring high detectivity and responsivity along with real-world sensing capability, suggests a new direction for next-generation optical communications, sensing, and imaging applications.

An optically controlled plasmonic switch that uses Au nanodisk arrays embedded in azobenzene‐doped, photoresponsive liquid crystals (LCs) is reported. The switch utilizes the photo‐induced phase transition of azobenzene‐doped LCs to alter the localized surface plasmon resonance (LSPR) of the Au nanodisks. The experimental modulation of the LSPR matches well with theoretical calculations. The influence of the angle of the incident light, power of the pump light, and wavelength of the probe light are also investigated.

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We have fabricated aminopropyltriethoxysilane (APTES)-functionalized nanoporous polymeric gratings by combining holographic interference patterning and APTES-functionalization of the pre-polymer syrup. The APTES facilitates the immobilization of biomolecules onto the polymeric grating surfaces. The successful detection of multiple biomolecules (biotin, steptavidin, biotinylated anti-rabbit IgG, and rabbit-IgG) indicates that the functionalized nanoporous polymeric gratings can act as biosensing platforms which are label-free, inexpensive, and applicable as high-throughput assays.