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Related Experiment Video

Updated: Apr 3, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

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Published on: October 11, 2016

Synchronous position two-photon interference of random-phase grating.

Peilong Hong, Guoquan Zhang

Journal of the Optical Society of America. A, Optics, Image Science, and Vision

|September 15, 2015

Summary

This summary is machine-generated.

Researchers achieved subwavelength interference using two-photon grating interference by controlling indistinguishable photon paths. Increasing grating slits enhances fringe visibility and enables N-fold subwavelength interference, offering control over optical coherence.

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Area of Science:

Quantum Optics
Photonics
Interference Phenomena

Background:

Previous work established random-phase gratings for optical interference.
Two-photon interference typically relies on Hanbury Brown and Twiss (HBT) type correlations.

Purpose of the Study:

To generalize random-phase grating structures for novel interference patterns.
To achieve non-HBT type two-photon grating interference.
To explore control over optical high-order coherence.

Main Methods:

Generalizing the phase structure of random-phase gratings.
Utilizing groups of indistinguishable two-photon paths modulated by spatial phase modes.
Selecting specific random-phase structures and grating slit numbers.

Main Results:

Demonstrated non-HBT type (synchronous position) two-photon grating interference.
Achieved N-fold subwavelength interference with periods reduced by a factor N (N=3,4,5,6,...).
Showed that increasing the number of grating slits improves the visibility of N-fold subwavelength interference fringes.

Conclusions:

Spatial modulation of two-photon paths via phase modes allows active control of optical high-order coherence.
The developed method offers a new scheme for generating and controlling subwavelength interference patterns.
This research opens possibilities for advanced optical coherence manipulation.