The superior stimuli-responsiveness, narrow linewidth, and high spectral multiplexing capacity of microlasers have led to their use as photonic tags for molecular labeling, encryption, and anticounterfeiting. However,...
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The superior stimuli-responsiveness, narrow linewidth, and high spectral multiplexing capacity of microlasers have led to their use as photonic tags for molecular labeling, encryption, and anticounterfeiting. However, the requirement of consistent lasing features for repeated measurements and the need for lasing features to change regularly with varying analytes pose a challenge to the efficient and convenient authentication of laser-encoded photonic tags for practical applications. To address this challenge, an optical microsphere array is proposed that provides a set of real-time typical lasing spectra collected from microspheres coated with specific recognition surface films of different sizes capable of recognizing one analyte or a mixture of analytes. These lasing spectra were transformed into 2D grayscale barcodes. Additionally, a gray value-quick response code (GV-QR code) is developed using deep learning methods, which enables the real-time monitoring and identification of molecular concentration changes through GV-QR autocoding, resulting in more precise, wide-ranging, and reliable molecular detection. This work introduces an optical microsphere array system for real-time mixed vapors sensing, transforming whispering gallery modes lasing spectra into 2D grayscale barcodes. The deep learning-based gray value-quick response code facilitates precise auto-coding and identification of molecular concentration changes, enhancing the accuracy and reliability of molecular sensing in various applications. image
Multidimensional optical encryption is crucial for enhancing information security. The manipulation of laser spatial modes has emerged as an advanced technique for expanding encoding dimensions. However, relying exclu...
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Multidimensional optical encryption is crucial for enhancing information security. The manipulation of laser spatial modes has emerged as an advanced technique for expanding encoding dimensions. However, relying exclusively on mode orders as the encoding dimension in mode-division multiplexing (MDM) still limits the potential for improving encryption security. In this study, multidimensional optical encryption is achieved by manipulating elliptical orbital angular momentum (OAM) modes within microlasers. By governing the photonic orbits in a Fabry-P & eacute;rot (FP) microcavity, four independent optical dimensions are established within a single elliptical OAM mode: azimuthal order, radial order, ellipticity, and long-axis direction. This configuration enables 4D encryption through the construction of a microcavity array. Moreover, the distinct laser patterns provide the microcavity array with a physical unclonable function (PUF), which further enhances the security level of the encryption device. This study presents a strategy for increasing the multiplexing capacity in microlasers, offering promising platforms for high-security optical encryption and anticounterfeiting.
Owing to outstanding optoelectronic properties, halide perovskites are great candidates for novel laser display applications. However, the realization of their practical flat-panel display applications is challenging ...
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Owing to outstanding optoelectronic properties, halide perovskites are great candidates for novel laser display applications. However, the realization of their practical flat-panel display applications is challenging because of the incapacity to controllably assemble different halide perovskite microlaser arrays onto an identical substrate as pixelated full-color panels due to intrinsic fragile crystal lattices. Here, perovskite red-green-blue (RGB) microdisk arrays are reported, acting as flat-panels for fullcolor laser displays. A universal screen-overprinting technology is developed to integrate full-color perovskite microdisk arrays on a prepatterned template, which is on the basis of wet-solute-chemical dynamics involving a combination of surface tailoring and solvent selection. Via such an overprinting method, perovskite RGB microlaser matrices with precise localizations and well-defined dimensions were fabricated on an identical substrate, and each set of RGB microlaser served as a pixel for full-color display panels. On this basis, static and dynamic laser displays have been demonstrated with as-prepared full-color panels. These results will provide novel design concepts and device structures for future full-color laser display applications.
YLaser displays, which offer wide achievable color gamut and excellent color rendering, have emerged as a promising next-generation display technology. Constructing display panels composed of pixelated microlaser arra...
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YLaser displays, which offer wide achievable color gamut and excellent color rendering, have emerged as a promising next-generation display technology. Constructing display panels composed of pixelated microlaser arrays is of great significance for the actualization of laser displays in the flat-panel sector. Here, we report microscale light-emitting electrochemical cell (LEC) arrays that operate as both optically pumped lasers and electroluminescence devices, which can be applied as self-emissive panels for high quality displays. Optically pumped red, green, and blue laser emissions were achieved in individual circular microcells consisting of corresponding conjugated polymers and electrolytes, suggesting that the microstructures can act as resonators for coherent outputs. As-prepared microstructures possess a narrowed recombination region, which dramatically increases the current density by 3 orders of magnitude under pulsed operation, compared with the corresponding thin-film devices, representing a promising solution-processed device platform for electrical pumping. Under programmable electrical excitation, both static and dynamic displays were demonstrated with such microscale LEC arrays as display panels. The prominent performance of the demonstrated structures (microlaser arrays embedded in LEC devices) provide us deep insight into the concepts and device constructions of electrically driven laser displays.
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