Broadband polarization-independent reflective 1×2 beam splitters under normal incidence based on encapsulated metal-dielectric gratings

Zhengkun Yin; Changhe Zhou; Junjie Yu; Yunkai Lu

doi:10.1117/12.2537284

18 November 2019 Broadband polarization-independent reflective 1×2 beam splitters under normal incidence based on encapsulated metal-dielectric gratings

Zhengkun Yin, Changhe Zhou, Junjie Yu, Yunkai Lu

Author Affiliations +

Proceedings Volume 11188, Holography, Diffractive Optics, and Applications IX; 111880U (2019) https://doi.org/10.1117/12.2537284
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

Abstract

An encapsulated metal-dielectric grating is proposed for realization of reflective broadband polarization-independent 1×2 beam splitter under normal incidence. One can quickly choose a grating structure to realize ultrabroad working waveband by using unified designing method for low-dispersion materials based on the diffraction efficiency map versus the normalized period and depth. Moreover, the center wavelength can be flexibly changed. As an example, a reflective ultrabroadband polarization-independent 1×2 beam splitters operating at wavelength of 1550 nm is designed under normal incidence. The simulation results indicated that a bandwidth of 144 nm could be achieved for the total efficiency over 92%. This kind of broadband polarization-independent 1×2 beam splitters could be found in a variety of applications, such as ultrashort pulse splitting, coherent beam combination, complex vector beam shaping, and also high precision displacement measurement.

Citation Download Citation

Zhengkun Yin, Changhe Zhou, Junjie Yu, and Yunkai Lu "Broadband polarization-independent reflective 1×2 beam splitters under normal incidence based on encapsulated metal-dielectric gratings", Proc. SPIE 11188, Holography, Diffractive Optics, and Applications IX, 111880U (18 November 2019); https://doi.org/10.1117/12.2537284

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