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Z. H. WU1,* , J. X. LIU2, Q. LUO1, X. WEN1
- School of Sciences, Southwest Petroleum University, 610500, Chengdu, China
- Science and Technology on Electronic Information Control Laboratory, 610036, Chengdu, China
In this paper, an original realization of broadband subwavelength terahertz near-field imaging is achieved by using a two-dimensional rhombic-lattice photonic crystal. The evanescent modes of a source are canalized by the Bloch modes of the photonic crystal that served as the flat lens. The structure is optimal designed by analyzing the equal frequency contours of the photonic crystal with the plane wave expansion method. Thebandwidth of the central frequency for subwavelength imaging is 17.42% that covers frequencies from 2.373 THz to 2.826 THz. The subwavelength imaging is demonstrated by means of finite-difference time-domain method..
Terahertz, Subwavelength imaging, Broadband, Photonic crystals, Rhombic lattice.
Submitted at: Jan. 28, 2020
Accepted at: Dec. 7, 2020
Z. H. WU, J. X. LIU, Q. LUO, X. WEN, Broadband subwavelength near-field imaging in terahertz range by a two-dimensional rhombic-lattice photonic crystal, Journal of Optoelectronics and Advanced Materials Vol. 22, Iss. 11-12, pp. 558-563 (2020)
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