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European Quantum Electronics Conference (EQEC)

Fluorescence of Rb atomic vapour confined inside a gap with thickness below 100 nm

David G. Sarkisyan, T. Varzhapetyan, Yu. P. Malakyan, Daniel Bloch, M. Ducloy

Published Jan 18, 2006• 0 citations
Publisher

Abstract

Resonant fluorescence on D/sub 2/ line of Rb atomic vapour confined in a nano-cell with the gap thickness in the range of 50-500 nm and excited by laser diode radiation (/spl lambda/ = 780 nm) has been studied. The fluorescence spectra was detected in perpendicular direction to the laser-radiation direction.
DOI
10.1109/eqec.2005.1567374

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It has been experimentally demonstrated that the use of the effect of significant narrowing of the fluorescence spectrum from a nanocell that contains a column of atomic Rb vapor with a thickness of L = 0.5λ (where λ = 794 nm is the wavelength of laser radiation, whose frequency is resonant with the atomic transition of the D 1 line of Rb) and the application of narrowband diode lasers allow the spectral separation and investigation of changes in probabilities of optical atomic transitions between levels of the hyperfine structure of the D 1 line of 87Rb and 85Rb atoms in external magnetic fields of 10–2500 Gs (for example, for one of transitions, the probability increases ∼17 times). Small column thicknesses (∼390 nm) allow the application of permanent magnets, which facilitates significantly the creation of strong magnetic fields. Experimental results are in a good agreement with the theoretical values. The advantages of this method over other existing methods are noted. The results obtained show that a magnetometer with a local spatial resolution of ∼390 nm can be created based on a nanocell with the column thickness L = 0.5λ. This result is important for mapping strongly inhomogeneous magnetic fields.
Absorption and fluorescence in Rb sub-micron cell on D2 line have been studied when the thickness L varies in the range of 0.5 λ - 3.5 λ, and the laser intensity is 0.1 - 1 W/cm2 (λ = 780 nm, λL ~ 5 MHz). When L = (2n +1) λ/2 (n-integer) and I ~ 0.1 W/cm2, revival of peaks of Dicke-type coherent narrowing effect with some modification of the spectra (as compared with low intensity regime) are still observable. The experimental results obtained at I ~ 1 W/cm2 for L = λ/2 show that there are no "dips" of a reduced absorption in the spectra, though there is a strong spectral broadening of the absorption (and fluorescence), as well as a reduction of the absorption (in contrast, I ~ 1 mW/cm2 is sufficient to create the dips when L = λ). Probably, this is caused by a strong Dicke narrowing regime when L = λ/2. Several additional differences of fluorescence and absorption spectra behaviour at high intensities are revealed.