We demonstrate a compact short-pass filter fabricated by integrating a microfiber ( in diameter) with a low-index substrate. By varying the interaction length (from ) between the microfiber and the substrate for wavelength-dependent evanescent leakage, the cutoff wavelength has been tuned over a wide range of . Typical rejection loss is higher than with insertion loss as low as . The fiber-diameter-dependent cutoff is also investigated, suggesting that the filter can be applied over a wide spectral range from . The microfiber-based short-pass filters demonstrated show advantages of compact size, wideband applicability, simple structure, high rejection loss, and compatibility with miniaturized fiber devices.
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