Polarization modulation spectroscopy of single fluorescent nanodiamonds with multiple nitrogen vacancy centers

Yuen Yung Hui, Yi Ren Chang, Nitin Mohan, Tsong Shin Lim, Yi Ying Chen, Huan Cheng Chang

研究成果: 雜誌貢獻文章同行評審

9 引文 斯高帕斯(Scopus)

摘要

A technique based on polarization modulation spectroscopy (PMS) has been developed to determine quantitatively the number of fluorophores in nanoparticles at the single-molecule level. The technique involves rotation of the polarization of the excitation laser on a millisecond time scale, leading to fluorescence intensity modulation. By taking account of the heterogeneous orientation among the dipoles of the fluorophores and simulating the modulation depth distribution with Monte Carlo calculations, we show that it is possible to deduce the ensemble average and number distribution of the fluorophores. We apply the technique to fluorescent nanodiamonds (FNDs) containing multiple nitrogen vacancy (NV) centers. Comparing the experimental and simulated modulation depth distributions of 11 nm FNDs, we deduce an average number of 〈N〉 = 3, which is in good agreement with independent photon correlation measurements. The method is general, rapid, and applicable to other nanoparticles, polymers, and molecular complexes containing multiple and randomly orientated fluorophores as well.

原文英語
頁(從 - 到)1878-1884
頁數7
期刊Journal of Physical Chemistry A
115
發行號10
DOIs
出版狀態已發佈 - 2011 三月 17

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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