Laser & Optoelectronics Progress, Volume. 56, Issue 2, 020501(2019)
Confocal System Based on the Negative Refraction of Two-Dimensional Photonic Crystals
In this study, a confocal system is proposed for which super-resolution imaging can be achieved based on the negative refraction and subwavelength imaging characteristics of two-dimensional photonic crystals (PCs). Further, the focusing and imaging processes of a confocal system are simulated with the finite-difference time-domain method. When the distance from the focus to the lower surface of a PC becomes 1.55 μm and when the transverse coordinate x=4, the full width at half maximum (FWHM) of the focus becomes 0.593λ, which is less than the incident wavelength; further, the FWHM of the reflected light in the right of the image point becomes 0.496λ, which indicates that super-resolution imaging can be realized. The FWHM of the image point decreases continuously when the focus shifts to right; further, the axial resolution of the confocal system becomes 2.2λ when the pinhole and focus are fixed.
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Jinke Niu, Binming Liang, Songlin Zhuang, Guoxu Wang, Yu Lei. Confocal System Based on the Negative Refraction of Two-Dimensional Photonic Crystals[J]. Laser & Optoelectronics Progress, 2019, 56(2): 020501
Category: Diffraction and Gratings
Received: Jul. 19, 2018
Accepted: Aug. 6, 2018
Published Online: Aug. 1, 2019
The Author Email: Liang Binming (bmliang78@aliyun.com)