Shifting beams at normal incidence via controlling momentum-space geometric phases

Jiajun Wang, Maoxiong Zhao, Wenzhe Liu (), Fang Guan, Xiaohan Liu, Lei Shi (), C. T. Chan and Jian Zi ()
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Jiajun Wang: Fudan University
Maoxiong Zhao: Fudan University
Wenzhe Liu: Fudan University
Fang Guan: Fudan University
Xiaohan Liu: Fudan University
Lei Shi: Fudan University
C. T. Chan: The Hong Kong University of Science and Technology, Clear Water Bay
Jian Zi: Fudan University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract When hitting interfaces between two different media, light beams may undergo small shifts. Such beam shifts cannot be described by the geometrical optics based on Snell’s law and their underlying physics has attracted much attention. Conventional beam shifts like Goos-Hänchen shifts and Imbert-Fedorov shifts not only require obliquely incident beams but also are mostly very small compared to the wavelength and waist size of the beams. Here we propose a method to realize large and controllable polarization-dependent lateral shifts for normally incident beams with photonic crystal slabs. As a proof of the concept, we engineer the momentum-space geometric phase distribution of a normally incident beam by controlling its interaction with a photonic crystal slab whose momentum-space polarization structure is designed on purpose. The engineered geometric phase distribution is designed to result in a large shift of the beam. We fabricate the designed photonic crystal slab and directly observe the beam shift, which is ~5 times the wavelength and approaches the waist radius. Based on periodic structures and only requiring simple manipulation of symmetry, our proposed method is an important step towards practical applications of beam shifting effects.

Date: 2021
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DOI: 10.1038/s41467-021-26406-5

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