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- W4281643881 abstract "Ultra-narrow optical spectral features resulting from highly dispersive light-matter interactions are essential for a broad range of applications such as spectroscopy, slow-light, and high-precision sensing. Features approaching sub-MHz, or equivalently, Q-factors approaching ~1 billion and beyond, are challenging to obtain in solid-state systems, ultimately limited by loss. We present a novel approach to achieve tunable sub-MHz spectral features, at room temperature, without resonators. We exploit gain-enhanced polarization pulling in a twisted birefringent medium where polarization eigenmodes are frequency-dependent. Using Brillouin gain in a commercial spun fiber, we experimentally achieve a 0.72 MHz spectral dip, the narrowest backward Brillouin scattering feature ever reported. Further optimization can potentially reduce the linewidth to <0.1 MHz. Our approach is simple and broadly applicable, offering on-demand tunability and high sensitivity, with a wide range of applications such as microwave photonic filters, slow and fast light, and optical sensing." @default.
- W4281643881 created "2022-06-13" @default.
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- W4281643881 date "2022-06-09" @default.
- W4281643881 modified "2023-10-18" @default.
- W4281643881 title "Sub-megahertz spectral dip in a resonator-free twisted gain medium" @default.
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- W4281643881 doi "https://doi.org/10.1038/s41566-022-01015-w" @default.
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