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Zhongguo kexue. Wulixue Lixue Tianwenxue

The effect of environment on fluorescence photon statistics of single molecule system

Han Bai

Published Jan 1, 2011• 0 citations
OpenAlex

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.

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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)].

The Journal of Chemical Physics•Aug 15, 2005•8 citations
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.
In this paper,we discuss the emission photon statistics of V -type three-level single molecule with permanent dipoles,which driven by continuous laser and electric radio frequency(rf) fields,via the generating function method developed recently.The average emission photon numbersN,lineshapes and the Mandel's Q parameters are studied at different detuning frequency and rf strength(internsity). The waiting time distribution w(t) is also studied.The results demonstrate that the emission photon statistical properties is strongly affected by the laser frequency and rf strength(intensity),in the other hand,we can control the emission photons through the external field.
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)].