Nanophotonic hybridization of narrow atomic cesium resonances and photonic stop gaps of opaline nanostructures

Article

关键词: ELECTROMAGNETICALLY INDUCED TRANSPARENCY;    SELECTIVE REFLECTION;    LIFETIME MEASUREMENTS;    SPONTANEOUS-EMISSION;    BRAGG-DIFFRACTION;    CRYSTALS;    SPECTROSCOPY;    TRANSITION;    VAPOR;    NANOCAVITY;   

DOI  :  10.1103/PhysRevB.91.045123

来源: SCIE

【 摘 要 】

We study a hybrid system consisting of a narrow-band atomic optical resonance and the long-range periodic order of an opaline photonic nanostructure. To this end, we have infiltrated atomic cesium vapor in a thin silica opal photonic crystal. With increasing temperature, the frequencies of the opal's reflectivity peaks shift down by >20% due to chemical reduction of the silica. Simultaneously, the photonic bands and gaps shift relative to the fixed near-infrared cesium D-1 transitions. As a result the narrow atomic resonances with high finesse (omega/Delta omega = 8 x 10(5)) dramatically change shape from a usual dispersive shape at the blue edge of a stop gap, to an inverted dispersion line shape at the red edge of a stop gap. The line shape, amplitude, and off-resonance reflectivity are well modeled with a transfer-matrix model that includes the dispersion and absorption of Cs hyperfine transitions and the chemically reduced opal. An ensemble of atoms in a photonic crystal is an intriguing hybrid system that features narrow defectlike resonances with a strong dispersion, with potential applications in slow light, sensing, and optical memory.

【 授权许可】

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