COVERED FOUR-PORT REFLECTIVE SPLITTER WITH ZEROTH ORDER CANCELLED

2020 ◽  
pp. 2150004
Author(s):  
CHEN FU ◽  
BO WANG ◽  
JIMIN FANG
Keyword(s):  
High Stability ◽  
Electric Field Distribution ◽  
Normal Incidence ◽  
Coupling Mechanism ◽  
Analysis Method ◽  
Wave Analysis ◽  
Zeroth Order ◽  
Overlap Integral ◽  
Rigorous Coupled Wave Analysis ◽  
Rigorous Coupled Wave

In this paper, the sandwiched configuration is designed under normal incidence with zeroth order eliminated so as to design a highly-efficient four-port output with polarization independence. Through rigorous coupled-wave analysis method, the splitting parameters are calculated to get a good polarization-independence effect, where the four reflective efficiencies are over 20%, respectively. The final findings show that this grating has good diffraction characteristics and high stability in practice. Furthermore, the coupling mechanism of grating can be explained for the cancellation of the zeroth order by studying the overlap integral and the electric field distribution.

scholarly journals Optical Design of Porous ZnO/TiO2 Films for Highly Transparent Glasses with Broadband Ultraviolet Protection

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Han Sung Song ◽  
Young Jin Yoo ◽  
Gil Ju Lee ◽  
Ki Soo Chang ◽  
Young Min Song
Keyword(s):  
Optical Design ◽  
Volume Averaging ◽  
Film Structure ◽  
Visible Range ◽  
Analysis Method ◽  
Wave Analysis ◽  
Electrical Field ◽  
Rigorous Coupled Wave Analysis ◽  
Ultraviolet Protection ◽  
Rigorous Coupled Wave

We present a design of a bilayer porous film structure on a glass substrate for the highly efficient ultraviolet (UV) protection with high visible-light transparency. To effectively block UVB (280–315 nm) and UVA (315–400 nm), titanium dioxide (TiO2) and zinc oxide (ZnO) are used as absorbing layers having the appropriate coverages in different UV ranges with extinction coefficients, respectively. We show the process of refractive index (RI) matching by controlling porosity (Pr). Effective RIs of porous media with TiO2 and ZnO were calculated based on volume averaging theory. Transmittances of the designed films with different effective RIs were calculated using rigorous coupled-wave analysis method. Using admittance loci method, the film thickness was optimized in center wavelengths from 450 to 550 nm. The results show that the optimal design provides high UV shielding performance at both UVA and UVB with high transparency in the visible range. We also analyze electrical field distributions in each layer and angle dependency with 3D HSV color map.

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 Measuring and modelling the reflectance spectra of male Swinhoe's pheasant feather barbules

2015 ◽  
Vol 12 (105) ◽  
pp. 20141354 ◽  
Author(s):  
Cheng-Chung Lee ◽  
Shih-Fang Liao ◽  
Pete Vukusic
Keyword(s):  
Oblique Incidence ◽  
Normal Incidence ◽  
Reflectance Spectra ◽  
Wave Analysis ◽  
Blue Band ◽  
Rigorous Coupled Wave Analysis ◽  
Rigorous Coupled Wave ◽  
Two Dimensional Photonic Crystal ◽  
Colour Appearance ◽  
Bright Blue

A range of iridescent colour appearances are presented by male Swinhoe's pheasants' ( Lophura swinhoii ) mantle feathers. Two distinct regions of the open pennaceous portion of its feathers display particularly conspicuous angle-dependent reflection. A bright blue band appears in one region at normal incidence that spatially shifts to another at higher illumination angles. The two-dimensional photonic crystal-like nanostructures inside the barbules of these two regions are similar. However, this study found that the spatial variation in their colour appearance results from a continuously changing orientation of barbules with respect to the alignment of their associated barb. A multi-layered rigorous coupled-wave analysis approach was used to model the reflections from the identified intra-barbule structures. Well-matched simulated and measured reflectance spectra, at both normal and oblique incidence, support our elucidation of the origin of the bird's distinctive feather colour appearance.

scholarly journals Accurate near-field calculation in the rigorous coupled-wave analysis method

2015 ◽  
Vol 17 (12) ◽  
pp. 125612 ◽  
Author(s):  
Martin Weismann ◽  
Dominic F G Gallagher ◽  
Nicolae C Panoiu
Keyword(s):  
Near Field ◽  
Field Calculation ◽  
Analysis Method ◽  
Wave Analysis ◽  
Rigorous Coupled Wave Analysis ◽  
Rigorous Coupled Wave ◽  
Coupled Wave

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.

scholarly journals Three-Method Hybrid Numerical Simulation for Surface-Plasmon-Enhanced GaInN-Based Light-Emitting Diodes with Metal-Embedded Nanostructures

2021 ◽  
Vol 9 ◽  
Author(s):  
Ryoya Hiramatsu ◽  
Ryo Takahashi ◽  
Ryoto Fujiki ◽  
Keisuke Hozo ◽  
Kanato Sawai ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Light Emitting Diodes ◽  
Simulation Tool ◽  
Wave Analysis ◽  
Light Emitting ◽  
Rigorous Coupled Wave Analysis ◽  
Physical Background ◽  
Simulation Results ◽  
Rigorous Coupled Wave ◽  
Difference Time

In this paper, a hybrid numerical simulation tool is introduced and performed for GaInN-based light-emitting diodes (LEDs) with metal-embedded nanostructure to theoretically predict external quantum efficiency (EQE), which composed of finite-difference time-domain, rigorous coupled wave analysis, and ray tracing. The advantage is that the proposed method provides results supported by sufficient physical background within a reasonable calculation time. From the simulation results, the EQE of LED with Ag-nanoparticles embedded nanostructure is expected to be enhanced by as high as ∼1.6 times the conventional LED device in theory.

Sign in / Sign up

Export Citation Format

Share Document