Sub-Rayleigh imaging via N-photon detection |
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Authors: | Guerrieri Fabrizio Maccone Lorenzo Wong Franco N C Shapiro Jeffrey H Tisa Simone Zappa Franco |
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Affiliation: | Dipartimento di Elettronica e Informazione, Politecnico di Milano, 20133 Milano, Italy. |
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Abstract: | The Rayleigh diffraction bound sets the minimum separation for two point objects to be distinguishable in a conventional imaging system. We demonstrate sub-Rayleigh resolution by scanning a focused beam--in an arbitrary, object-covering pattern that is unknown to the imager--and using N-photon photodetection implemented with a single-photon avalanche detector array. Experiments show resolution improvement by a factor ~(N-N(max))(?) beyond the Rayleigh bound, where N(max) is the maximum average detected photon number in the image, in good agreement with theory. |
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