Abstract

We demonstrate a compact short-pass filter fabricated by integrating a microfiber ($\sim 1\mu \mathrm{m}$ in diameter) with a low-index substrate. By varying the interaction length (from $0.65\text{\hspace{0.17em} to}3\mathrm{mm}$) between the microfiber and the substrate for wavelength-dependent evanescent leakage, the cutoff wavelength has been tuned over a wide range of $400\mathrm{nm}$. Typical rejection loss is higher than $40\mathrm{dB}$ with insertion loss as low as $0.3\mathrm{dB}$. The fiber-diameter-dependent cutoff is also investigated, suggesting that the filter can be applied over a wide spectral range from $600\text{to}1500\mathrm{nm}$. 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.

© 2008 Optical Society of America

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