scholarly journals Vertical Injection and Wideband Grating Coupler Based on Asymmetric Grating Trenches

2021 ◽  
Author(s):  
Md Asaduzzaman ◽  
Robert J. Chapman ◽  
Brett C. Johnson ◽  
Alberto Peruzzo
Keyword(s):  
Fdtd Method ◽  
Coupling Efficiency ◽  
Silicon On Insulator ◽  
Subwavelength Structures ◽  
Grating Coupler ◽  
Subwavelength Gratings ◽  
Vertical Injection ◽  
Index Variation ◽  
2D Fdtd ◽  
Difference Time

Abstract A Silicon-on-insulator (SOI) perfectly vertical fibre-to-chip grating coupler is proposed and designed based on engineered subwavelength structures. The high directionality of the coupler is achieved by implementing step gratings to realize asymmetric diffraction and by applying effective index variation with auxiliary ultra-subwavelength gratings. The proposed structure is numerically analysed by using two-dimensional Finite Difference Time Domain (2D FDTD) method and achieves 76% (-1.19 dB) coupling efficiency and 39 nm 1-dB bandwidth.

scholarly journals Butterfly-Inspired 2D Periodic Tapered-Staggered Subwavelength Gratings Designed Based on Finite Difference Time Domain Method

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Houxiao Wang ◽  
Wei Zhou ◽  
Er Ping Li ◽  
Rakesh Ganpat Mote
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Fdtd Method ◽  
Subwavelength Structures ◽  
Surface Reflection ◽  
Subwavelength Gratings ◽  
Difference Time

The butterfly-inspired 2D periodic tapered-staggered subwavelength gratings were developed mainly using finite difference time domain (FDTD) method, assisted by using focused ion beam (FIB) nanoscale machining or fabrication. The periodic subwavelength structures along the ridges of the designed gratings may change the electric field intensity distribution and weaken the surface reflection. The performance of the designed SiO2gratings is similar to that of the corresponding Si gratings (the predicted reflectance can be less than around 5% for the bandwidth ranging from 0.15 μm to 1 μm). Further, the antireflection performance of the designedx-unspaced gratings is better than that of the correspondingx-spaced gratings. Based on the FDTD designs and simulated results, the butterfly-inspired grating structure was fabricated on the silicon wafer using FIB milling, reporting the possibility to fabricate these FDTD-designed subwavelength grating structures.

scholarly journals Large-Area Binary Blazed Grating Coupler between Nanophotonic Waveguide and LED

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Hongqiang Li ◽  
Wenqian Zhou ◽  
Meiling Zhang ◽  
Yu Liu ◽  
Cheng Zhang ◽  
...  
Keyword(s):  
Incident Angle ◽  
Coupling Efficiency ◽  
Silicon On Insulator ◽  
Grating Coupler ◽  
Large Area ◽  
Blazed Grating ◽  
Light Emitting ◽  
Arrayed Waveguide ◽  
First Time ◽  
Difference Time

A large-area binary blazed grating coupler for the arrayed waveguide grating (AWG) demodulation integrated microsystem on silicon-on-insulator (SOI) was designed for the first time. Through the coupler, light can be coupled into the SOI waveguide from the InP-based C-band LED for the AWG demodulation integrated microsystem to function. Both the length and width of the grating coupler are 360 μm, as large as the InP-based C-band LED light emitting area in the system. The coupler was designed and optimized based on the finite difference time domain method. When the incident angle of the light source is0°, the coupling efficiency of the binary blazed grating is 40.92%, and the 3 dB bandwidth is 72 nm at a wavelength of 1550 nm.

scholarly journals Fully three-dimensional analysis of a photonic crystal assisted silicon on insulator waveguide bend

2018 ◽  
Vol 32 (31) ◽  
pp. 1850344 ◽  
Author(s):  
N. Eti ◽  
Z. Çetin ◽  
H. S. Sözüer
Keyword(s):  
Photonic Crystal ◽  
Numerical Study ◽  
Fdtd Method ◽  
Three Dimensional ◽  
Silicon On Insulator ◽  
Geometrical Parameters ◽  
Low Loss ◽  
Bending Loss ◽  
Difference Time ◽  
Waveguide Bend

A detailed numerical study of low-loss silicon on insulator (SOI) waveguide bend is presented using the fully three-dimensional (3D) finite-difference time-domain (FDTD) method. The geometrical parameters are optimized to minimize the bending loss over a range of frequencies. Transmission results for the conventional single bend and photonic crystal assisted SOI waveguide bend are compared. Calculations are performed for the transmission values of TE-like modes where the electric field is strongly transverse to the direction of propagation. The best obtained transmission is over 95% for TE-like modes.

2x2 Optical Switch Based on Silicon-on-Insulator Microring Resonator

2011 ◽  
Vol 378-379 ◽  
pp. 531-534
Author(s):  
B. Mardiana ◽  
Hanim Abdul Razak ◽  
H. Hazura ◽  
S. Shaari ◽  
P. Susthitha Menon ◽  
...  
Keyword(s):  
Optical Switch ◽  
Free Spectral Range ◽  
Fdtd Method ◽  
Single Mode ◽  
Microring Resonator ◽  
Silicon On Insulator ◽  
Electric Signal ◽  
Compact Size ◽  
Near Future ◽  
Difference Time

In near future, silicon-on-insulator (SOI) microring resonator are expected to be basic components for wavelength filtering and switching due to their compact size and wide free spectral range (FSR). In this paper, a 2X2 optical switch by using active microring resonator is proposed. The switch is consists of second order serially cascaded microring coupled to a pair of waveguide. The ON/OFF state of the design is control by electric signal which will vary the refractive index. The device is design to operate at 1.55µm wavelength. With a 500nm x 200nm rib dimensions, the design is proven to have single mode behaviour. Finite-Difference Time-Domain (FDTD) method simulation by RSOFT software is use to characterize the device performance. The results show that the 2X2 optical switch proposed can be an efficient device to be functioning in WDM application.

Design and numerical analyses of the planar grating coupler

2010 ◽  
Vol 58 (4) ◽  
pp. 509-512 ◽  
Author(s):  
P. Struk ◽  
T. Pustelny
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Planar Waveguides ◽  
Numerical Analyses ◽  
Grating Coupler ◽  
Grating Couplers ◽  
Numerical Investigations ◽  
Output System ◽  
Difference Time

Design and numerical analyses of the planar grating couplerThe paper presents the results of numerical analyses of the structures of integrated optics in the form of planar waveguides made of materials with high values of the refractive indexn= 2.00 and with an input-output system in the form of Bragg grating couplers. The numerical investigations were carried out by using the FDTD method (Finite Difference Time Domain method).

Investigation of Adhesion Materials for Gold Line-and-Space Surface Plasmon Antenna on SOI-MOS Photodiode

2011 ◽  
Vol 222 ◽  
pp. 201-204 ◽  
Author(s):  
Hiroaki Satoh ◽  
Yuki Matsuo ◽  
Hiroshi Inokawa ◽  
Atsushi Ono
Keyword(s):  
Finite Difference ◽  
Surface Plasmon ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Light Sensitivity ◽  
Silicon On Insulator ◽  
Electromagnetic Simulation ◽  
Metal Insulator ◽  
Difference Time

In order to improve the light sensitivity of silicon-on-insulator metal-insulator-semiconductor (SOI-MOS) photodiode, differences caused by the adhesion materials for gold (Au) line-and-space (L/S) surface plasmon (SP) antenna in MOS structure are evaluated based on the electromagnetic simulation using finite difference time domain (FDTD) method.

scholarly journals Multiple Layers of Silicon-Silica (Si-SiO2) Pair onto Silicon Substrate towards Highly Efficient, Wideband Silicon Photonic Grating Coupler

2016 ◽  
Author(s):  
Md Asaduzzaman ◽  
Masuduzzaman Bakaul ◽  
Stan Skafidas ◽  
Md Rezwanul Haque Khandokar
Keyword(s):  
Coupling Efficiency ◽  
Single Mode ◽  
Guided Wave ◽  
Grating Coupler ◽  
Si Substrate ◽  
Constructive Interference ◽  
Reflected Waves ◽  
Waveguide Grating ◽  
Silicon Photonic ◽  
Difference Time

A single mode waveguide grating coupler based on multiple Si-SiO2 pairs onto Si substrate has been designed. Numerical analysis has been carried out to calculate optimum thickness of the layers of Si-SiO2 that ensures the constructive interference between reflected waves and actual guided wave for high coupling efficiency. Based on the results, an optimal design is developed and modeled by using a 2-D finite difference time domain (2-D FDTD) simulator that dictates a coupling efficiency of as much as 78% (-1.07 dB) at the wavelength of 1550 nm, and a 1-dB bandwidth of 77 nm. The numerical method will be useful to calculate the optimum thicknesses of the layers for any reflector based grating coupler of different materials.

A Multi-Slot-Waveguide-Based Ring Resonator Sensor on Silicon-on-Insulator Platform: Design and Simulation

2013 ◽  
Vol 710 ◽  
pp. 404-407
Author(s):  
Liang Gao ◽  
Guo Hui Yuan ◽  
Xing Li Liu ◽  
Yu Ren Chen
Keyword(s):  
Ring Resonator ◽  
Free Spectral Range ◽  
Fdtd Method ◽  
Silicon On Insulator ◽  
Asymmetric Structure ◽  
Slot Waveguide ◽  
A Value ◽  
Organic Solutions ◽  
Difference Time ◽  
Sensing Characteristics

We design a double slots based on micro-ring resonator on silicon-on-insulator (SOI). An asymmetric structure is considered for the ring waveguide in order to improve the sensor's bending efficiency. Finite-difference time-domain (FDTD) method is used to analyze and optimize this sensor. The optimized size of the sensor is below 25×15μm2. Numerical analysis shows that when the radius of the micro-ring is about 5μm, the sensitivity reaches a value of 708nm/RIU, which is ten times of that of the conventional micro-ring sensor. Quality factor (Qfactor) of 580 and free spectral range (FSR) of 33nm are also obtained. Our analysis also shows that the sensor has good sensing characteristics to different organic solutions.

scholarly journals Modeling and Analysis of SOI Gratings-Based Opto-Fluidic Biosensor for Lab-on-a-Chip Applications

Photonics ◽  
2019 ◽  
Vol 6 (2) ◽  
pp. 71 ◽  
Author(s):  
Venkatesha Muniswamy ◽  
Prasant Kumar Pattnaik ◽  
Narayan Krishnaswamy
Keyword(s):  
Coupling Efficiency ◽  
Microfluidic Channel ◽  
Lab On A Chip ◽  
Silicon On Insulator ◽  
Grating Coupler ◽  
Fluidic Channel ◽  
Modeling And Analysis ◽  
Injection Angle ◽  
Grating Structure ◽  
Optical Grating

The design, modeling, and analysis of a silicon-on-insulator (SOI) grating coupler integrated with a microfluidic channel for lab-on-a-chip applications are presented. The grating coupler was designed to operate at 1310 nm. The simulated SOI structure consisted of a 220 nm top-Si device layer with an integrated waveguide, grating coupler, and a buried oxide layer of 2 µm. A rectangular microfluidic channel was deposited on the SOI optical grating structure for light and fluid interaction. The fluidic flow through the device was driven by centrifugal and Coriolis forces. The grating structure was designed to achieve a maximum coupling efficiency at the optimized injection angle of the light source. The sensitivity of the grating structure could be analyzed and evaluated using the change in coupled power as a function of the effective refractive index and was found to be 0.928 × 10−6 RIU. The SOI optical grating structure along with the micro fluidic channel on top could be effectively used as an absorbance-based lab-on-a-chip biosensor.

scholarly journals Subwavelength Grating Structures in Silicon-on-Insulator Waveguides

2008 ◽  
Vol 2008 ◽  
pp. 1-8 ◽  
Author(s):  
J. H. Schmid ◽  
P. Cheben ◽  
S. Janz ◽  
J. Lapointe ◽  
E. Post ◽  
...  
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Silicon On Insulator ◽  
Experimental Results ◽  
Subwavelength Grating ◽  
Subwavelength Gratings ◽  
Facet Reflectivity ◽  
Difference Time ◽  
Photonic Wire

First implementations of subwavelength gratings (SWGs) in silicon-on-insulator (SOI) waveguides are discussed and demonstrated by experiment and simulations. The subwavelength effect is exploited for making antireflective and highly reflective waveguide facets as well as efficient fiber-chip coupling structures. We demonstrate experimentally that by etching triangular SWGs into SOI waveguide facets, the facet power reflectivity can be reduced from 31% to <2.5%. Similar structures using square gratings can also be used to achieve high facet reflectivity. Finite difference time-domain simulations show that >94% facet reflectivity can be achieved with square SWGs for 5 μm thick SOI waveguides. Finally, SWG fiber-chip couplers for SOI photonic wire waveguides are introduced, including design, simulation, and first experimental results.

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