Coupling mechanism and field distribution of reflective grating for 1<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e372" altimg="si2.svg"><mml:mo>×</mml:mo></mml:math>5 splitting

Gao, Chenhao; Wang, Bo; Wen, Kunhua; Meng, Ziming; Nie, Zhaogang; Xing, Xiangjun; Chen, Li; Liu, Liang; Zhou, Jinyun

doi:10.1016/j.optcom.2019.07.076

Cited by 12 publications

(7 citation statements)

References 18 publications

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“…Table 2 shows the performances comparison of our work to other conventionally designed reported performances of the five-port grating. As can be seen from Table 2, although the reported polarization-dependent five-port grating [28] can have higher diffraction efficiencies in each order for TE or TM polarization and wider spectral bandwidth when comparing to our grating, the complicated and time-consuming fabrication processes of the grating impedes such device applying in actual optical applications. In this work, we firstly propose and design a novel two-layer five-port polarization-independent grating.…”

Section: Study Of Fabrication Tolerance and Incident Spectral Bandwidthmentioning

confidence: 87%

“…Hence, polarization-dependent three-port beam splitter grating [27] was proposed, where the output different diffraction orders were the −2nd order, the −1st order and the 0th order, respectively. Similarly, under normal incident condition, some of five-port reflective or transmission beam splitter gratings [28], [29] are numerically optimized based on polarization-dependent designs, which are limited for applying in optical domains.…”

Section: Introductionmentioning

confidence: 99%

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Polarization-Independent Two-Layer Grating With Five-Port Splitting Output Under Normal Incidence

Gong

Wen

2020

IEEE Photonics J.

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In this paper, we report a two-layer five-port diffraction grating by a polarizationindependent design under normal incidence. To be different from conventional five-port gratings, initially, we design a novel two-layer grating with operation in transmission. Next, we firstly design a polarization-independent grating with five-port splitting output. On the one hand, the accurate grating vector parameters are optimized using rigorous coupled-wave analysis (RCWA) approach. On the other hand, the inherent coupling mechanism happened in the grating region can be well explained by employing simplified modal method (SMM). More importantly, all reported conventional five-port beam splitter gratings were designed based on polarization dependent. Although they could obtain high diffraction efficiency for TE or TM polarization, it requires more complicated and time-consuming fabrication processes in practical grating applications. Thus, this work can open up a possible thought for designing polarization-independent multi-port beam splitter diffraction gratings.

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Section: Study Of Fabrication Tolerance and Incident Spectral Bandwidthmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Polarization-Independent Two-Layer Grating With Five-Port Splitting Output Under Normal Incidence

Gong

Wen

2020

IEEE Photonics J.

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“…Because of the symmetry of the structure, the reflection efficiencies of −2nd order and +2nd order are the same. Therefore, in the following calculation, the reflection efficiencies of only 0th, +1st and +2nd orders need to considered [33].…”

Section: Numerical Simulation Of 1 × 3 Double-groove Reflection Gratingmentioning

confidence: 99%

“…Before optimizing the design, the thickness of the Ag layer h m is set to 0.1 µm, which is enough for reflection [33]. By analysis using FEM, a double-groove grating for threechannel beam separation around the 1550 nm wavelength can be determined.…”

Section: Numerical Simulation Of 1 × 3 Double-groove Reflection Gratingmentioning

confidence: 99%

Double-groove reflection grating for three-channel beam separation at infrared wavelength

Gao¹,

Wang²

2020

Laser Phys.

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Double-groove reflection gratings are proposed for three-channel beam separation under two polarizations at infrared laser wavelength. The double-groove grating profiles are analyzed by use of the finite element method. Incident laser light is reflected into the 0th and ±2nd orders equally for both TE and TM polarizations, which has the merit of polarization independence. The total diffraction efficiencies of three orders are more than 95% for each of two polarizations. Compared with the reported single-groove three-port grating, the double-groove grating has a wide incident bandwidth and a large tolerance of grating period. The presented reflection grating for three-channel beam separation should be a useful optical device at infrared wavelength in practical applications.

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“…The polarized light under the second Bragg incidence is incident on the grating layer and reflected by the Al reflective layer. The internal mechanism of the grating exit can be explained from the energy distribution of the grating [29][30][31].…”

Section: Structure and Numerical Analyzationmentioning

confidence: 99%

Terahertz polarization reflective devices based on one-dimensional grating structure

Huang¹,

Wang²

2020

Laser Phys.

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In this paper, the application of rectangular metal reflective grating as a polarization device is studied using a rigorous coupled-wave analysis method. Three polarization reflection devices are presented in the terahertz band. In addition, data verification is achieved based on the finite element method and the light field distribution of the device is analyzed to explain the physical mechanism. One of these devices splits the planar light into two mutually orthogonal output beams. The efficiency of TE polarization is 98.07%, and the efficiency of TM polarization is 97.86%. Furthermore, the process parameters of the three polarization devices, as well as the influence of incident wavelength and incident angle on efficiencies are also studied in the terahertz band.

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Coupling mechanism and field distribution of reflective grating for 1×5 splitting

Cited by 12 publications

References 18 publications

Polarization-Independent Two-Layer Grating With Five-Port Splitting Output Under Normal Incidence

Polarization-Independent Two-Layer Grating With Five-Port Splitting Output Under Normal Incidence

Double-groove reflection grating for three-channel beam separation at infrared wavelength

Terahertz polarization reflective devices based on one-dimensional grating structure

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