scholarly journals Design of Ultra-Compact Optical Memristive Switches with GST as the Active Material

Micromachines ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 453 ◽  
Author(s):  
Ningning Wang ◽  
Hanyu Zhang ◽  
Linjie Zhou ◽  
Liangjun Lu ◽  
Jianping Chen ◽  
...  
Keyword(s):  
Extinction Ratio ◽  
Active Material ◽  
High Refractive Index ◽  
Silicon Waveguide ◽  
Index Contrast ◽  
Fdtd Simulations ◽  
Low Insertion Loss ◽  
Amorphous States ◽  
Change Material ◽  
Difference Time

In the following study, we propose optical memristive switches consisting of a silicon waveguide integrated with phase-change material Ge2Sb2Te5 (GST). Thanks to its high refractive index contrast between the crystalline and amorphous states, a miniature-size GST material can offer a high switching extinction ratio. We optimize the device design by using finite-difference-time-domain (FDTD) simulations. A device with a length of 4.7 μm including silicon waveguide tapers exhibits a high extinction ratio of 33.1 dB and a low insertion loss of 0.48 dB around the 1550 nm wavelength. The operation bandwidth of the device is around 60 nm.

Coupler for butt-coupling between edge-emitting lasers and inverted Si taper waveguide

2019 ◽  
Vol 33 (09) ◽  
pp. 1950074
Author(s):  
Baoguang Sun ◽  
Congzhong Cai ◽  
Haojie Ni ◽  
Renbing Tan
Keyword(s):  
Coupling Efficiency ◽  
High Refractive Index ◽  
Core Material ◽  
Silicon Waveguide ◽  
Laser Alignment ◽  
Index Contrast ◽  
High Index Contrast ◽  
Emitting Lasers ◽  
Novel Design ◽  
Butt Coupling

A novel design and analysis of a butt-coupler are presented to be coupled with an edge-emitting laser and a silicon waveguide. The coupler is fairly effective when used with an edge-emitting laser of a certain integrated size and a high refractive index core material. Butt-coupling is not sensitive to polarization as both TE and TM modes achieve similar efficiency. The laser alignment tolerance and silicon waveguide gap in both lateral and vertical positions were studied. Although the air gap between the laser and the silicon cladding reduces coupling efficiency greatly, gap filling can help solve this problem. This design is proved to be quite effective in dealing with high index contrast and huge size mismatch between the laser and semiconductor waveguide.

scholarly journals Optical Modulator using Ultra-Thin Silicon Waveguide in SOI Hybrid Technology

2021 ◽  
Author(s):  
Ahmed B. Ayoub ◽  
Mohamed Swillam
Keyword(s):  
Extinction Ratio ◽  
Active Material ◽  
High Sensitivity ◽  
Silicon On Insulator ◽  
Organic Polymer ◽  
Optical Modulator ◽  
Silicon Waveguide ◽  
Wide Range ◽  
Thin Silicon ◽  
On Chip

Abstract We propose a detailed study of an on-chip optical modulator using a non-conventional silicon-based platform. This platform is based on the optimum design of ultra-thin silicon on insulator (SOI) waveguide. This platform is characterized by low field confinement inside the core waveguide and high sensitivity to the cladding index. Accordingly, it lends itself to a wide range of applications, such as sensing and optical modulation. By employing this waveguide into the Mach-Zehnder interferometer (MZI) configuration, an efficient optical modulator is reported using an organic polymer as an active material for the electro-optic effect. An extinction ratio of more than 20 dB is achieved with energy per bit of 13.21 fJ/bit for 0.5 V applied voltage. This studied platform shows promising and adequate performance for modulation applications. It is cheap and easy to fabricate.

Design and Analysis of Ultra-Fast All-Optical Modulator Based on Photonic Crystal

2016 ◽  
Vol 37 (3) ◽  
Author(s):  
Asghar Abolhasanzadeh ◽  
Mahdi Zavvari
Keyword(s):  
Insertion Loss ◽  
Extinction Ratio ◽  
Signal Beam ◽  
Microring Resonator ◽  
Optical Modulator ◽  
Plane Wave Expansion ◽  
All Optical ◽  
Crustal Structures ◽  
Low Insertion Loss ◽  
Difference Time

AbstractAn all-optical modulator based on photonic crustal structures is proposed and its performance characteristics are studied. In this modulator, a carrier beam is controlled by input signal beam. A two-dimensional microring resonator is designed to employ the Kerr’s nonlinear effect and operate as modulator. We use numerical methods such as plane wave expansion and finite difference time domain for performing our simulations and studying the optical properties of the proposed structure. The insertion loss and extinction ratio are studied as a function of carrier power. Results show acceptable orders of extinction ratio about 9 dB and very low insertion loss about –10 dB. The proposed modulator is expected to show ultra-fast modulation.

Low insertion loss and high extinction ratio analysis of a new surface plasmon resonance based photonic crystal fiber filter

Optik ◽  
2019 ◽  
Vol 194 ◽  
pp. 163069 ◽  
Author(s):  
Kawsar Ahmed ◽  
Md. Ferdous ◽  
Md. Nazmul Hossen ◽  
Bikash Kumar Paul ◽  
I.S. Amiri ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Surface Plasmon ◽  
Insertion Loss ◽  
Plasmon Resonance ◽  
Extinction Ratio ◽  
Ratio Analysis ◽  
Crystal Fiber ◽  
Low Insertion Loss

Integrated platform based on high refractive index contrast waveguide for optical guiding and sorting

2010 ◽  
Author(s):  
Balpreet Singh Ahluwalia ◽  
Olav Gaute Hellesø ◽  
Ananth Z. Subramanian ◽  
James S. Wilkinson ◽  
Jie Chen ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Refractive Index ◽  
Refractive Index Contrast ◽  
Integrated Platform ◽  
Index Contrast

Resonant modal analysis and dual-mode tailoring in high refractive index contrast two-dimensional nanorod arrays

Optik ◽  
2019 ◽  
Vol 181 ◽  
pp. 231-238
Author(s):  
Jianyu Zhou ◽  
Tian Sang ◽  
Junlang Li ◽  
La Wang ◽  
Rui Wang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Modal Analysis ◽  
High Refractive Index ◽  
Two Dimensional ◽  
Nanorod Arrays ◽  
Dual Mode ◽  
Refractive Index Contrast ◽  
Index Contrast

scholarly journals Design of an Aluminum/Polymer Plasmonic 2D Crystal for Label-Free Optical Biosensing

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3335
Author(s):  
Luca Tramarin ◽  
Carlos Angulo Barrios
Keyword(s):  
Surface Plasmon Polariton ◽  
Design Parameters ◽  
Device Performance ◽  
Label Free ◽  
Multi Objective Optimization ◽  
Optical Biosensing ◽  
Plasmonic Crystal ◽  
Fdtd Simulations ◽  
Points Of View ◽  
Difference Time

A design study of a nanostructured two-dimensional plasmonic crystal based on aluminum and polymeric material for label-free optical biosensing is presented. The structure is formed of Al nanohole and nanodisk array layers physically separated by a polymeric film. The photonic configuration was analyzed through finite-difference time-domain (FDTD) simulations. The calculated spectral reflectance of the device exhibits a surface plasmon polariton (SPP) resonance feature sensitive to the presence of a modeled biolayer adhered onto the metal surfaces. Simulations also reveal that the Al disks suppress an undesired SPP resonance, improving the device performance in terms of resolution as compared to that of a similar configuration without Al disks. On the basis of manufacturability issues, nanohole diameter and depth were considered as design parameters, and a multi-objective optimization process was employed to determine the optimum dimensional values from both performance and fabrication points of view. The effect of Al oxidation, which is expected to occur in an actual device, was also studied.

scholarly journals Tunable Infrared Optical Switch Based on Vanadium Dioxide

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2988
Author(s):  
Qi Wang ◽  
Shijie Zhang ◽  
Chen Wang ◽  
Rui Li ◽  
Tianhan Cai ◽  
...  
Keyword(s):  
Thin Film ◽  
Vanadium Dioxide ◽  
Optical Switching ◽  
Modulation Depth ◽  
Optical Switch ◽  
Extinction Ratio ◽  
Infrared Region ◽  
Metallic Phase ◽  
Ultrafast Switching ◽  
Difference Time

A tunable infrared optical switch based on a plasmonic structure consisting of aluminum nanoarrays with a thin film of vanadium dioxide is proposed. This optical switch can realize arbitrary wavelength-selective optical switching in the mid-infrared region by altering the radii of the aluminum nanoarrays. Furthermore, since vanadium dioxide transforms from its low-temperature insulator phase to a high-temperature metallic phase when heated or applied voltage, the optical switch can achieve two-way switching of its “ON” and “OFF” modes. Finite-difference time-domain software is used to simulate the performance of the proposed infrared optical switch. Simulation results show that the switch offers excellent optical performances, that the modulation depth can reach up to 99.4%, and that the extinction ratio exceeds −22.16 dB. In addition, the phase transition time of vanadium dioxide is on the femtosecond scale, which means that this optical switch based on a vanadium dioxide thin film can be used for ultrafast switching.

Sign in / Sign up

Export Citation Format

Share Document