Journal
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 58, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.7567/1347-4065/ab2832
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Funding
- National Basic Research Program of China [2015CB659400]
- Natural Science Foundation of Jiangsu Province [BK20150057]
- Fundamental Research Funds for the Central Universities [021314380100]
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We provide a two-dimensional honeycomb photonic crystal, exhibiting accidental triply- degenerate points for each polarization at two frequencies with 2 times relationships. Using (k) over right arrow center dot (p) over right arrow method and group theory, we demonstrate the zero refractive index phenomenon at two different polarizations. Without considering the additional loss, the numerical simulation shows that the honeycomb crystal exhibits greatly enhanced second harmonic generation (SHG) conversion efficiency over the traditional nonlinear materials. Our study has established the prerequisites for the photonic structure to achieve the phase-matching SHG naturally. (c) 2019 The Japan Society of Applied Physics
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