Abstract

By generalizing the phase structure of the random-phase grating we recently designed [Opt. Express 21, 14056 (2013) [CrossRef]  ], we show that non-HBT type (synchronous position) two-photon grating interference can be obtained, which physically relies on groups of multiple indistinguishable two-photon paths modulated by the spatial distributions of phase modes. By properly selecting the random-phase structures, synchronous position subwavelength interference can be obtained, the period of which, in the two-photon interference domain, is decreased by a factor $N$ ($=\mathrm{3,4},\mathrm{5,6},\dots$), depending on the slit number and random-phase structure, and the visibility of $N$-fold subwavelength interference fringes could be improved by increasing the slit number of the grating. The results show that modulation on two-photon paths via spatial arrangements of the phase modes offers the possibility to actively control the optical high-order coherence in the same optical scheme.

© 2015 Optical Society of America

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