Jian Shi, Jun Li, Cuicui Li, Yuqiu Zhang, Jiangnan Lv, Yan Zhan, Xianping Wang, Yibin Huang, Jian Wu
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Tunable photonic differentiator via Bloch surface waves
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 (\(\partial {r}_{s}/\partial \lambda =3.5\times {10}^{3}\)) 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.
期刊介绍：
The European Physical Journal D (EPJ D) presents new and original research results in:
Atomic Physics;
Molecular Physics and Chemical Physics;
Atomic and Molecular Collisions;
Clusters and Nanostructures;
Plasma Physics;
Laser Cooling and Quantum Gas;
Nonlinear Dynamics;
Optical Physics;
Quantum Optics and Quantum Information;
Ultraintense and Ultrashort Laser Fields.
The range of topics covered in these areas is extensive, from Molecular Interaction and Reactivity to Spectroscopy and Thermodynamics of Clusters, from Atomic Optics to Bose-Einstein Condensation to Femtochemistry.
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