Abstract
Novel functionalities of disorder-induced scattering effect in random lasers, attributed to low spatial coherence, draw remarkable attention in high-contrast to superior quality speckle-free imaging applications. This paper demonstrates perovskite-polystyrene (PS)-based random lasing action with robust optical performance at room temperature. Optical characterizations are carried out upon perovskite thin films addition with polystyrene of different mixing concentrations (wt.%). A low threshold lasing operation is achieved with an increasing concentration of polystyrene, accompanying a wavy surface texture with high surface roughness. The rough surface dominating multiple scattering effects leads to enhanced feedback efficiency. Moreover, this study also elucidates efficient fabrication process steps for the development of high quality and durable PS-based random lasers. With the advantages of reduced coherent artifacts and low spatial coherence, speckle free projection images of the USAF (U. S. Air Force MIL-STD-150A standard of 1951) resolution test chart are shown for different PS-based random lasers.
Highlights
Recent technological advancements in the research of lead halide perovskites have drawn remarkable attention in the context of optoelectronics device applications
Organic-inorganic lead halide perovskite-based laser devices are achieved by employing nanowires and whispering gallery modes for feedback oscillation [10,11,12]
Patterned and flattened perovskite thin films incorporated into distributed feedback (DFB) lasers, vertical cavity surface emitting lasers, photonic crystal lasers, and optical cavities were reported
Summary
Recent technological advancements in the research of lead halide perovskites have drawn remarkable attention in the context of optoelectronics device applications. Thanks to the high optical gain in MAPbX3 materials, only a thin film perovskite with proper scattering centers is able to achieve random lasing action without a complicated laser cavity fabrication process [18,19,20,21,22,23]. The significance of having a polystyrene layer on the top of perovskite thin film is to enhance optical feedback efficiency due to the photon recycling process. This is induced by the multiple reflection processes at the perovskite/polystyrene and polyimide/perovskite interfaces. A comparative imaging analysis with coherent laser source (Nd: YAG) demonstrates that the low coherence perovskite-polystyrene (wt.%) based random lasers are efficient in speckle free image projection
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