Optical resonance with subwavelength spectral coherence switch in open-end cavity

The physical properties of light fields at the subwavelength scale have emerged as extensively pursued objectives in nano-optics, photonics, and plasmonics. Here, we report that in the paraxial regime, the spectral density and the spectral axial coherence ( z -coherence) structures in a submicron ra...

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Bibliographic Details
Published in:Science China. Physics, mechanics & astronomy mechanics & astronomy, 2023-07, Vol.66 (7), p.274213, Article 274213
Main Authors: Wan, Lipeng, Raveh, David, Yu, Tianbao, Zhao, Daomu, Korotkova, Olga
Format: Article
Language:English
Subjects:
Astronomy
Classical and Continuum Physics
Coherence
Density
Holes
Light
Light beams
Nano-optics
Nanomaterials
Nanotechnology
Observations and Techniques
Optical resonance
Optics
Photonics
Physical properties
Physics
Physics and Astronomy
Point pairs
Propagation
Standing waves
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Summary:The physical properties of light fields at the subwavelength scale have emerged as extensively pursued objectives in nano-optics, photonics, and plasmonics. Here, we report that in the paraxial regime, the spectral density and the spectral axial coherence ( z -coherence) structures in a submicron range can be generated by employing a light beam with a suitably chosen spatial coherence state in a counter-propagating configuration, in an open-end cavity. It is established that while the spectral density forms an optical standing wave, the z -coherence state depends on the symmetry of the selected point pair and in particular, the phenomenon termed as periodical coherence switch is found. Our findings shed new light on the discussion of the role of spatial coherence in the photonic cavities, possibly inspiring further studies in the field of enhanced light-nanomaterials interactions by optical cavity. This provides a versatile framework for tailoring coherence in subwavelength space with promising applications in metrology and imaging.
ISSN:1674-7348
1869-1927
DOI:10.1007/s11433-023-2097-9