https://doi.org/10.1140/epjd/s10053-024-00867-x
Regular Article - Optical Phenomena and Photonics
Tunable photonic differentiator via Bloch surface waves
1
College of Physics and Communication Electronics, Jiangxi Normal University, 330022, Nanchang, China
2
College of Science and Technology, Jiangxi Normal University, 330022, Nanchang, China
3
Sanchuan Wisdom Technology Co., Ltd, Sanchuan Hydraulic Industrial Park, Longgang Section, Hi-Tech Development Zone, 335200, Yingtan, China
4
College of Advanced Interdisciplinary Studies, National University of Defense Technology, 410073, Changsha, China
b
loogra@163.com
j
wujian15203@163.com
Received:
30
January
2024
Accepted:
17
May
2024
Published online:
22
August
2024
Optical differentiation is an exceptional real-time edge detection technology that enables extracting the image features, yet current optical differentiators are still lacking a resolution tunability. Based on the Bloch surface waves excited in a prism/one-dimensional photonic crystal structure, a wavelength-tuned optical differentiator with a high sensitivity (
) is proposed since any minute variation of the wavelength will easily give rise to a dramatic change in the Goos–Hänchen shifts of two reflected orthogonal components. Via the polarization transformation and extinction, the reflected output field can be approximately expressed as a first-order differential of the input field, and thus, it can operate the edge detection along one orientation. Our scheme can extend to two-dimensional edge detection by rotating the object and may find potential applications in cell and molecular imaging.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
