A broadband polarization-independent two-port beam splitter under normal incidence based on encapsulated metal-dielectric reflective grating

2020 ◽  
Vol 18 (7) ◽  
pp. 070501
Author(s):  
Zhengkun Yin ◽  
Yunkai Lu ◽  
Junjie Yu ◽  
Changhe Zhou
Keyword(s):  
Beam Splitter ◽  
Normal Incidence ◽  
Polarization Independent

Investigation on multilayer microstructure grating for three-port splitting

2016 ◽  
Vol 30 (16) ◽  
pp. 1650195
Author(s):  
Wenhao Shu ◽  
Bo Wang ◽  
Hao Pei ◽  
Hongtao Li ◽  
Li Chen ◽  
...  
Keyword(s):  
Beam Splitter ◽  
Single Layer ◽  
Zeroth Order ◽  
First Order ◽  
Transmission Grating ◽  
Dielectric Layers ◽  
Incident Waves ◽  
Reflection Grating ◽  
Independent Property ◽  
Polarization Independent

A new structure of microstructure reflection three-port beam splitter grating is described in this paper. The grating includes two dielectric layers and a metal slab on the substrate, where incident waves are reflected into the zeroth-order and the ± first-order with polarization-independent property. With the optimized grating profile, reflection efficiencies’ ratios between the first-order and the zeroth-order can reach 0.998 and 1.001 for TE and TM polarizations, respectively. Especially, the reflection grating can diffract efficiencies more than 30% into the ± first-order and the zeroth-order with the incident angular bandwidth of −1.9–1.9[Formula: see text] for TM polarization, which can have merits compared with single-layer transmission grating.

Design and fabrication of a polarization-independent two-port beam splitter

2009 ◽  
Vol 48 (29) ◽  
pp. 5636 ◽  
Author(s):  
Jijun Feng ◽  
Changhe Zhou ◽  
Jiangjun Zheng ◽  
Hongchao Cao ◽  
Peng Lv
Keyword(s):  
Beam Splitter ◽  
Polarization Independent

Encapsulated grating for three-port beam splitter in reflection

2016 ◽  
Vol 30 (06) ◽  
pp. 1650070 ◽  
Author(s):  
Wenhao Shu ◽  
Bo Wang ◽  
Hongtao Li ◽  
Liang Lei ◽  
Li Chen ◽  
...  
Keyword(s):  
Beam Splitter ◽  
High Efficiency ◽  
Normal Incidence ◽  
Grating Period ◽  
Practical Application ◽  
Wave Analysis ◽  
Incident Wavelength ◽  
Rigorous Coupled Wave Analysis ◽  
Rigorous Coupled Wave ◽  
Independent Property

An encapsulated grating with a metal slab is designed as a reflection three-port beam splitter at the wavelength of 1550 nm under normal incidence. Such a new grating is aimed to separate energies into the ±1st and the 0th orders for both TE and TM polarizations. The grating parameters such as grating period, duty cycle and grating depth are optimized by using rigorous coupled-wave analysis. Based on optimized grating parameters, efficiencies can reach more than 32% with the polarization-independent property. It indicates that reflection three-port beam splitter with high efficiency can be obtained by the encapsulated grating. Moreover, the presented reflection three-port grating has advantages of wide incident wavelength range and angular bandwidth, which would be useful in practical application.

scholarly journals Diffraction mechanism of five-port transmission gratings

2020 ◽  
Vol 50 (4) ◽  
Author(s):  
Chenhao Gao ◽  
Bo Wang ◽  
Kunhua Wen ◽  
Ziming Meng ◽  
Qu Wang ◽  
...  
Keyword(s):  
Beam Splitter ◽  
Diffraction Order ◽  
Normal Incidence ◽  
Propagation Mechanism ◽  
Beam Splitting ◽  
Transmission Grating ◽  
Process Tolerance ◽  
Wide Range ◽  
Rigorous Coupled Wave ◽  
Modal Method

This paper designs a five-port transmission grating under normal incidence. Rigorous coupled-wave approach is used to optimize the grating parameters. The energy of the grating is mainly dispersed to the 0th, ±1st and ±2nd orders. The efficiency of each diffraction order under both polarizations is close to 20%. The modal method is used to describe the propagation mechanism of the two polarized lights in the grating, and the diffraction behavior of the grating is analyzed. In addition, the grating has a wide range of incident characteristics and a large process tolerance. Therefore, this five-port beam splitter with a connecting layer will be a good polarization-independent beam splitting device.

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