Seeing small |
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Authors: | Taras Plakhotnik |
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Institution: | School of Physical Sciences, The University of Queensland, 4072 QLD, Australia |
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Abstract: | This paper reviews a number of used and/or proposed ideas for optical detection of small particles including single-molecules. Different techniques (direct absorption and scattering, interferometry, use of sub Poissonian statistics, cavity enhancement, and thermal lens detection) are compared in terms of signal-to-noise (SNR) ratio. It is shown that scattering (resonance and non-resonance) remains the method of choice for most practical applications. Thermal lens detection can do potentially better, but its performance critically depends on the thermal properties of the particle surroundings. |
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Keywords: | 42 25 Hz 87 64 Cc 87 64 Ni 82 80 Kq |
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