Research on reflective three-output by packaged grating under second Bragg angle

2019 ◽  
Vol 33 (25) ◽  
pp. 1950305 ◽  
Author(s):  
Wenhua Zhu ◽  
Bo Wang ◽  
Chenhao Gao ◽  
Kunhua Wen ◽  
Ziming Meng ◽  
...  
Keyword(s):  
High Efficiency ◽  
Incident Light ◽  
Polarized Light ◽  
Bragg Angle ◽  
Duty Ratio ◽  
Wave Analysis ◽  
Incident Wavelength ◽  
Rigorous Coupled Wave Analysis ◽  
Rigorous Coupled Wave ◽  
The Given

This paper designed a novel three-output reflective packaged grating. The optimized parameters such as the period and depth of the high-efficiency three-output grating with an incident wavelength of 1550 nm can be calculated by rigorous coupled-wave analysis (RCWA). According to the optimized result, the grating can diffract the incident light energy into three orders with an efficiency of nearly 33% under the premise of second Bragg angle incidence and the given duty ratio of 0.5. The diffraction efficiency of the packaged grating is improved compared to the surface-relief three-output grating under second Bragg angle incidence, especially for TE-polarized light.

SURFACE-COVERED 1×3 GRATING WITH DIELECTRIC-METAL SLABS UNDER SECOND BRAGG INCIDENCE

2020 ◽  
Vol 27 (09) ◽  
pp. 1950201
Author(s):  
CHEN FU ◽  
BO WANG ◽  
WENHUA ZHU ◽  
KUNHUA WEN ◽  
ZIMING MENG ◽  
...  
Keyword(s):  
Incident Light ◽  
Polarized Light ◽  
Transverse Magnetic ◽  
Second Order ◽  
Bragg Angle ◽  
Efficiency Ratio ◽  
First Order ◽  
Rigorous Coupled Wave Analysis ◽  
Rigorous Coupled Wave ◽  
The Given

This paper designed a novel three-port reflective surface-covered grating with a connecting layer. The grating can be used as a splitter, and the polarized light can be divided into zero order, first order and second order. Through rigorous coupled-wave analysis, the efficiency of the three orders of diffraction light is close to 33% under the condition that the incident light at 1550 nm is incident at the second Bragg angle and the given duty cycle is 0.5. The efficiency and bandwidth of the surface-covered grating are improved compared with that of the surface-relief grating reported in the past. Especially for transverse magnetic polarized light, the beam splitting effect is more uniform, the efficiency ratio of the zeroth order to first order can reach 1.01, and the efficiency ratio of the first order to second order can reach 1.

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.

Reflective three-port high-efficiency grating with two dielectric layers based on a sandwiched configuration

2016 ◽  
Vol 30 (12) ◽  
pp. 1650072 ◽  
Author(s):  
Hongtao Li ◽  
Bo Wang ◽  
Hao Pei ◽  
Wenhao Shu ◽  
Li Chen ◽  
...  
Keyword(s):  
High Efficiency ◽  
Transverse Electric ◽  
Transverse Magnetic ◽  
Wave Analysis ◽  
Beam Splitting ◽  
Practical Applications ◽  
Rigorous Coupled Wave Analysis ◽  
Dielectric Layers ◽  
Rigorous Coupled Wave ◽  
Sandwiched Structure

In this paper, we describe a novel reflective sandwiched three-port grating with two dielectric layers. The two-layer sandwiched grating can separate incident wave into the [Formula: see text] and the 0th-order with high-efficiency beam splitting and good splitting ratios for both transverse electric (TE) and transverse magnetic (TM) polarizations. The grating parameters can be optimized by using rigorous coupled-wave analysis (RCWA) with a special duty cycle of 0.6. With the optimized results, efficiencies more than 32% in the [Formula: see text]st-orders and the 0th-order can be obtained. Furthermore, performance of the incident bandwidth and aspect ratio can be improved. Compared with conventional surface-relief grating, the grating with sandwiched structure is aimed at cleaning and protecting grating surface. The presented reflective two-layer sandwiched three-port grating would be put into practical applications for its beneficial performances.

Modes simulation and numerical optimization of encapsulated connecting-layer grating for high efficiency

2018 ◽  
Vol 32 (31) ◽  
pp. 1850386 ◽  
Author(s):  
Chenhao Gao ◽  
Bo Wang ◽  
Hongtao Li ◽  
Kunhua Wen ◽  
Ziming Meng ◽  
...  
Keyword(s):  
Numerical Optimization ◽  
High Efficiency ◽  
Photonic Devices ◽  
The Novel ◽  
Wave Analysis ◽  
Rigorous Coupled Wave Analysis ◽  
Rigorous Coupled Wave ◽  
Polarization Independent ◽  
Modal Method ◽  
Coupled Wave

We propose and investigate a polarization-independent high-efficiency encapsulated subwavelength grating with a connecting layer in this paper. Numerical simulated method of rigorous coupled-wave analysis is adopted for optimization. Based on the simulated precise results, a simplified modal method is used to give perspicuous physical propagating fundamentals and explain wideband performance in the grating, where the coupled efficiencies by means of the simplified modal method are to be in conformity with the calculated values of the rigorous coupled-wave analysis for TE and TM polarizations. Compared with the researched surface-relief polarization-independent single-port grating, efficiencies are improved with 98.1% for TE polarization and 98.2% for TM polarization. Hence, the novel gratings with some superiorities are suitable for promising photonic devices.

Fabrication of Phase Reflection Sawtooth Gratings Optimized by Scalar and Vector Way by Using Diamond Cutting

2008 ◽  
Author(s):  
ChaBum Lee ◽  
T. Kuriyagawa ◽  
TaeJun Kim ◽  
SunKyu Lee
Keyword(s):  
Incident Light ◽  
Wave Analysis ◽  
Diamond Cutting ◽  
Rigorous Coupled Wave Analysis ◽  
Shaping Process ◽  
Coated Surface ◽  
Rigorous Coupled Wave ◽  
Coated Surfaces ◽  
Electroless Ni ◽  
Phase Reflection

This paper presents optimization of phase reflection sawtooth gratings with a period of 2.0 μm and a depth of 0.2 μm based on the Fourier transformation (FT) and the rigorous coupled wave analysis (RCWA). And its fabrication on oxygen free Cu and electroless Ni-coated surfaces by using diamond cutting in a shaping process whose toolpath is interfered to provide smaller period. The diffraction efficiencies were estimated 100% for FT, 83.0% and 79.0% for TE and TM polarization of the incident light at a depth of 0.2 μm. It was found that electroless Ni-coated surface had better performance in terms of machining and optical functionality. From optical testing, the diffraction efficiencies were measured 84.0% and 84.4% for TE and TM polarization, respectively.

Design of High-Efficiency Diffraction Gratings Based on Rigorous Coupled-Wave Analysis for 800 nm Wavelength

2008 ◽  
Vol 25 (5) ◽  
pp. 1684-1686 ◽  
Author(s):  
Kong Wei-Jin ◽  
Yun Mao-Jin ◽  
Liu Shi-Jie ◽  
Jin Yun-Xia ◽  
Fan Zheng-Xiu ◽  
...  
Keyword(s):  
High Efficiency ◽  
Diffraction Gratings ◽  
Wave Analysis ◽  
Rigorous Coupled Wave Analysis ◽  
Rigorous Coupled Wave ◽  
Coupled Wave

Reflection performance research of grating with polarization independence based on a sandwiched structure

2018 ◽  
Vol 32 (04) ◽  
pp. 1850042
Author(s):  
Hao Pei ◽  
Bo Wang ◽  
Wenhua Zhu ◽  
Sufang Yin ◽  
Li Chen ◽  
...  
Keyword(s):  
High Efficiency ◽  
Optical Element ◽  
The Novel ◽  
First Order ◽  
Rigorous Coupled Wave Analysis ◽  
Rigorous Coupled Wave ◽  
Sandwiched Structure ◽  
The Given ◽  
Performance Research ◽  
Modal Method

The novel reflective grating was studied under Littrow incidence as one sort of high-efficiency optical element. A covering layer and a dielectric layer are employed in this structure to achieve higher efficiency and wider bandwidth. For the given wavelength of 1550 nm, by using two-beam-interference theory of modal method, duty cycle and period of grating can be calculated, where the physical essence of high efficiency in the first-order is well explained by the modal method. The other grating parameters are optimized by using rigorous coupled-wave analysis. The optimized grating has an appropriate aspect ratio and shows that diffraction efficiencies of TE and TM polarizations in the first-order are greater than 97%. Compared with the reported surface-relief high-efficiency grating, the diffraction efficiencies of the proposed grating for TE and TM polarizations can be greatly improved.

Rigorous Coupled Wave Analysis of Surface Plasmon Resonance Sensor Based on Metallic Grating

2011 ◽  
Vol 211-212 ◽  
pp. 465-468
Author(s):  
De Wei Chen
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Diffraction Order ◽  
Wave Analysis ◽  
Metallic Grating ◽  
Rigorous Coupled Wave Analysis ◽  
Resonance Sensor ◽  
Rigorous Coupled Wave ◽  
Coupled Wave

Since the development almost a decade ago of the first biosensor based on surface plasmon resonance (SPR), the use of this technique has increased steadily. In this study, we theoretically investigated the sensing character of SPR sensor with reflection type metallic with Rigorous Coupled Wave Analysis (RCWA) method, and the mechanism is analyzed by the field distribution. It is found that the sensitivity of negative diffraction order, which goes higher quickly as the resonant angle increases, is much greater than that of positive diffraction order.

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