28 July 1994 Narrow-band planar waveguide transmission filter using spectral hole-burning
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We demonstrate a new integrated narrow-band spectral filter which consists of a planar waveguide covered with a thin polymer film donated with molecules liable to persistent spectral hole-burning (SHB) at liquid helium temperature. We show that such a device performs as a miniature programmable narrow-band spectral filter with a transmission bandwidth less than 1 angstrom. In contrast to currently used techniques, the frequency resolution of a SHB filter is limited, in first place, by the width of the homogeneous zero-phonon lines of the chromophore molecules, and not by the geometrical dimensions of the device.
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Marcel Tschanz, Aleksander Rebane, Urs Paul Wild, "Narrow-band planar waveguide transmission filter using spectral hole-burning", Proc. SPIE 2213, Nanofabrication Technologies and Device Integration, (28 July 1994); doi: 10.1117/12.180975; https://doi.org/10.1117/12.180975

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