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Zhongguo kexue. Wulixue Lixue Tianwenxue

环境对单分子体系荧光光子统计性质的影响

Baiping Han, Zheng Yujun

Published Oct 1, 2011• 2 citations
Publisher

Abstract

The fluorescence photon emission of single molecule two-level system (TLS) simultaneously driven by the laser and electric radio frequency (RF) fields is investigated, using the generating function method developed recently. The fluorescence photon statistical properties of single molecule TLS are studied theoretically, under the single laser pulse field and the single RF pulse. Further, we can control the photon emission of two-level system.

DOI
10.1360/132010-1206

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The fluorescence photon emission of single molecule two-level system (TLS) simultaneously driven by the laser and electric radio frequency (RF) fields is investigated, using the generating function method developed recently. The fluorescence photon statistical properties of single molecule TLS are studied theoretically, under the single laser pulse field and the single RF pulse. Further, we can control the photon emission of two-level system.
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The photon emission from a single molecule driven simultaneously by a laser and a slow electric radio frequency (rf) field is studied. We use a non-Hermitian Hamiltonian approach which accounts for the radiative decay of a two-level system modeling the single-molecule source. We apply the renormalization group method for differential equations to obtain long time solution of the corresponding Schrodinger equation, which allows us to calculate the average waiting time for the first photon emission. Then, we analyze the conditions for suppression and enhancement of photon emission in this dissipative two-level system. In particular we derive a transcendental equation, which yields the nontrivial rf field control parameters, for which enhancement and suppression of photon emission occurs. For finite values of radiative decay rate an abrupt transition to the state when both situations are indistinguishable is found for certain values of the rf field parameters. Our results are shown to be in agreement with the available experiments [Ch. Brunel et al., Phys. Rev. Lett. 81, 2679 (1998)].