Despite the demonstrated high performance of random media based computational spectrometer and polarimeter, the underlying physical mechanisms enabling high-resolution capabilities remain insufficiently explored, which impedes the structural optimization of random media for higher per- formance within small size. Therefore, realizing sub-picometer spectral resolution with full stokes polarization measurement within a millimeter-scale footprint remains a significant challenge. In this work, we demonstrate a miniaturized high-performance spectropolarimeter based on microtaper leaky-mode and whispering gallery mode (WGM) microcavity. A theoretical model for speckle-based spectral and polarimetric measurement is established, which reveals the funda- mental relationship between resolution and random media characteristics in computational spec-
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Resonant microtaper leaky-mode computational spectropolarimetry with tens of femtometers spectral resolution and full Stokes measurement
Yangyang Wan, Qianyu Zhou, Lin Ma, Xinyu Fan, Zuyuan He
Research context
Emerging computational measurement techniques for acquiring multi-dimensional optical field information, such as spectrum and polarization, are rapidly advancing and offer promising solutions for realizing high-performance miniature systems. The performance of these computational measurement approaches is critically influenced by the choice of random media, yet a general framework for evaluating different implementations remains absent. Here, we propose a general analytical model for computational measurement systems and reveal that the system resolution is fundamentally determined by the maximum optical path difference (OPD) permitted within the random medium. Building on this theoretical foundation, we present a resonant leaky-mode (RLM) spectropolarimeter that achieves a record high resolution-footprint-product metric. The RLM spectropolarimeter leverages the complex coupling between leaky modes in a tapered coreless optical fiber and whispering-gallery modes of microsphere to significantly enhance the maximum OPD within a compact footprint. We simultaneously achieve an ultrahigh spectral resolution of 20 fm, a spectral measurement bandwidth of 150 nm, and full-Stokes polarizati
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Yangyang Wan, Qianyu Zhou, Lin Ma, Xinyu Fan, Zuyuan He. Resonant microtaper leaky-mode computational spectropolarimetry with tens of femtometers spectral resolution and full Stokes measurement. Nature Communications (2026). https://doi.org/10.1038/s41467-026-72313-y
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