期刊
APPLIED PHYSICS LETTERS
卷 109, 期 11, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4962639
关键词
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资金
- National Basic Research Program of China [2012CB921503, 2013CB632702]
- National Nature Science Foundation of China [11134006, 11474158, 11404164]
- Natural Science Foundation of Jiangsu Province [BK20140019]
- Academic Program Development of Jiangsu Higher Education (PAPD)
Optical structures with balanced loss and gain provide an efficient platform to study the features of light propagation under non-Hermitian parity-time symmetry. Here, we report a feasible design of one-dimensional parity-time symmetric diffraction grating, where the real and imaginary parts of refractive index are separately modulated. Due to the spontaneous breaking of parity-time symmetry at the exceptional point, asymmetric diffractions are observed between a pair of oblique incident light. This asymmetric phenomenon, determined by the modulation direction of the introduced parity-time symmetry, is also polarization-dependent. The coupled-mode theory is implemented to theoretically analyze the polarization dependent asymmetric diffraction, showing consistence with numerical simulations. Our findings may provide a feasible way for manipulating light and instructively inspire the development of diffraction optics. Published by AIP Publishing.
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