Journal
NANO LETTERS
Volume 22, Issue 10, Pages 3993-3999Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c00572
Keywords
Metasurface; ultracompact; orbital angular momentum sorter
Categories
Funding
- National Key Research and Development Program of China [2018YFB2200403]
- National Natural Science Foundation of China [12025402, 11974092, 62125501, 61975041, 91850204, 11934012]
- Shenzhen Fundamental Research projects [JCYJ20180507183532343, JCYJ20180507184613841, JCYJ20200109112805990, JCYJ20200109113003946, JCYJ20210324120402006]
- Photonics Center of Shenzhen University
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This study demonstrates an ultracompact on-chip OAM sorter using TiO2 metasurfaces integrated onto a CMOS camera, which efficiently separates OAM beams with different topological charges and achieves low crosstalk.
On-chip integrated orbital angular momentum (OAM) sorting is of great importance in tackling the severe challenge of exponential growth in data traffic. Despite the continuous success, current demultiplexing techniques either scarify efficiency dramatically or lose the compactness of a system. Here we experimentally demonstrate an ultracompact OAM sorter using TiO2 metasurfaces integrated onto a complementary metal-oxide-semiconductor (CMOS) camera. By utilizing the propagation phases, we transfer the unitary transformation theory in bulky systems into two TiO2 metasurfaces, responsible for the functions of log-polar transformation and fan-out beam copying and focusing as well as the functions of phase correction and Fourier transform. The flatform metasurface doublet enables one to integrate the OAM sorter onto a camera chip. Consequently, OAM beams with topological charges of m = -3 to 3 were separated by a CMOS camera with an average crosstalk of -6.43 dB. This approach shall shed light on next-generation OAM modes processing.
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