Coherent emission of light using stacked gratings

Yongkang Gong, Xianliang Liu, Kang Li, Sara Carver, Juan Martinez, Daniel Rees-Whippey, Jungang Huang, Nigel Copner, Leiran Wang, Wenfu Zhang, Tao Duan

Research output: Contribution to journalArticlepeer-review


The possibility of temporally and spatially coherent thermal emission has been demonstrated utilizing stacked gratings. We demonstrate that the metallic grating with narrow air slit behaves like a homogeneous slab with large permittivity and small permeability and find that the interaction between the metallic grating and the Bragg grating gives rise to impendence matching at wavelengths located in the photonic band gap of the Bragg grating, which enables the stacked gratings to perform high emission with ultranarrow spectrum and antenna-like spatial response. This paves the way towards the design of a novel infrared source platform for applications such as thermal analysis, imaging, security, biosensing, and medical diagnoses.
Original languageEnglish
Number of pages5
JournalPhysical Review B
Issue number20
Publication statusE-pub ahead of print - 26 Apr 2013


  • emission


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