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Remarkable optical coupling enhancement with laser selective focusing devices

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Abstract

In this paper, Fresnel zone plates (FZPs) have been employed as optical coupling devices to enhance the response of versatile laser detection systems. Two kinds of FZPs, amplitude-Fresnel zone plate (AFZP) and phase-Fresnel zone plate (PFZP), were fabricated and studied for comparison. The simulation and experiment results indicate that the FZPs have selective focusing abilities for wavelength and coherence of the incident lights, which contributes to high collection efficiency to the laser signals as well as suppression to the ambient lights. A 34 and 26 times gain in response were obtained when illuminated by coherent laser light by applying an AFZP and PFZP to an InGaAs/InP p-i-n photodetector, respectively. And a 30 % reduction in response was achieved by using an AFZP when illuminated by incoherent Tungsten-halogen lamp. In addition, 9.6 times of response enhancement has been observed after utilizing the AFZP for the laser ranging system.

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Acknowledgments

The authors thank prof. Lixin You from Shanghai Institute of Microsystem and Information Technology, CAS for providing the laser ranging system for the measurements. This work was partially supported by the Shanghai Science and Technology Foundations (15DZ2282100, 16DZ2290600) and the Youth Innovation Promotion Association CAS (2012189).

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Correspondence to Shao-Wei Wang.

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Ji, R., Wang, SW., Chen, F. et al. Remarkable optical coupling enhancement with laser selective focusing devices. Opt Quant Electron 48, 473 (2016). https://doi.org/10.1007/s11082-016-0744-2

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  • DOI: https://doi.org/10.1007/s11082-016-0744-2

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