| Original Articles |
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Appropriate Gate Time for Single Molecular Photon Detection Based on Optimal Signal-to-Noise Ratio Analyses |
| DONG Shuang-Li;HUANG Tao;LIU Yuan;WANG Jun;XIAO Lian-Tuan;JIA Suo-Tang |
| State Key Laboratory of Quantum Optics and Quantum Optics Devices, College of Physics and Electronics Engineering, Shanxi University, Taiyuan 030006 |
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| Cite this article: |
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DONG Shuang-Li, HUANG Tao, LIU Yuan et al 2007 Chin. Phys. Lett. 24 1224-1227 |
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Abstract Signal-to-noise ratio of fluorescence detection from a single molecule is analysed by using time-gated techniques. It is found that the optimal signal-to-noise ratio can be obtained by choosing an appropriate gate time with a certain optical background. The dependences of molecular fluorescence lifetime and the optimal signal-to-noise ratio on the appropriate gate time are respectively discussed with two kinds of background sources, chaotic state with uniform distribution and coherent state with exponential distribution in time domain. For chaotic state background we find that a certain range for appropriate gate time can be obtained with a definite fluorescence lifetime, larger fluorescence lifetime would lower the value of optimal signal-to-noise
ratios. For coherent state background we find that there is also a narrow range of appropriate gate time when lifetime of single molecule is less than that of background photons.
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| Keywords:
33.50.-j
42.50.Dv
33.80.-b
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Received: 15 November 2006
Published: 23 April 2007
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| PACS: |
33.50.-j
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(Fluorescence and phosphorescence; radiationless transitions, quenching (intersystem crossing, internal conversion))
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42.50.Dv
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(Quantum state engineering and measurements)
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33.80.-b
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(Photon interactions with molecules)
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