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Room temperature single-photon Source:Single-dye molecule fluorescence in Liquid Crystal host

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5 Author(s)
Lukishova, S.G. ; Inst. of Opt., Univ. of Rochester, NY, USA ; Schmid, A.W. ; McNamara, A.J. ; Boyd, R.W.
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We report on new approaches toward an implementation of an efficient, room temperature, deterministically polarized, single-photon source (SPS) on demand-a key hardware element for quantum information and quantum communication. Operation of a room temperature SPS is demonstrated via photon antibunching in the fluorescence from single terrylene-dye molecules embedded in a cholesteric liquid crystal host. Using oxygen-depleted liquid crystal hosts, dye-bleaching was avoided over the course of more than 1 h of continuous 532-nm excitation. Liquid crystal hosts (including liquid crystal oligomers/polymers) permit further increase of the efficiency of the source: 1) by aligning the dye molecules along a direction preferable for maximum excitation efficiency; 2) by tuning a one-dimensional (1-D) photonic-band-gap microcavity of planar-aligned cholesteric (chiral nematic) liquid crystal layer to the dye fluorescence band.

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:9 ,  Issue: 6 )