scholarly journals Numerical Investigation and Design of Electrically-Pumped Self-Pulsing Fano Laser Based on III-V/Silicon Integration

Photonics ◽  
2021 ◽  
Vol 8 (12) ◽  
pp. 530
Author(s):  
Yingming Zhao ◽  
Yu Li ◽  
Weiping Huang
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Ring Resonator ◽  
Saturable Absorption ◽  
Coupling Region ◽  
Picosecond Pulses ◽  
Electrically Pumped ◽  
Cmos Compatible ◽  
Fdtd Simulations ◽  
Difference Time

A self-pulsing III-V/silicon laser is designed based on the Fano resonance between a bus-waveguide and a micro-ring resonator, partially covered by the graphene as a nonlinear saturable absorption component. The Fano reflector etched on the straight waveguide is used as one of the cavity mirrors in the coupling region to work with the graphene induced loss and nonlinearity to achieve pulsed lasing in GHz repetition frequency. The detailed lasing characteristics are studied numerically by using the rate equation and finite-difference time-domain (FDTD) simulations. The results show that the CMOS compatible hybrid laser can generate picosecond pulses with repetition rate at 1~3.12 GHz, which increases linearly with the injection current.

STUDY ON A SORT OF CONTROLLABLE NONLINEAR LEFT-HANDED MATERIALS

2009 ◽  
Vol 18 (03) ◽  
pp. 441-456 ◽  
Author(s):  
HONG XIN ZHANG ◽  
LAN ZHAO ◽  
YING HUA LU
Keyword(s):  
Resonance Frequency ◽  
Time Domain ◽  
Material Properties ◽  
Finite Difference Time Domain ◽  
Transmission Properties ◽  
The Past ◽  
Left Handed ◽  
High Harmonics ◽  
Fdtd Simulations ◽  
Difference Time

In this paper, three kinds of controllable nonlinear left-handed materials (DNLHMs) are proposed and analyzed, which are designed by introducing inductors and capacitors into the traditional nonlinear left-handed materials (NLHMs) as inhomogeneous doped elements. Due to such changes, several new transmission properties have been presented through finite-difference time-domain (FDTD) simulations. These have brought new features to our DNLHMs. On one hand, the original passband in the traditional nonlinear left-handed material is narrowed after introducing inductors. In addition, a new passband, which does not exist in doped linear LHMs, is generated. On the other hand, through introducing capacitors, the original passband of the nonlinear left-handed material can be shifted, resonance frequency can be changed, and a new passband can be generated. When capacitors and inductors are introduced simultaneously, the material properties, such as the number of passbands, the characteristic resonance frequency, and the bandwidth, can also be changed. Noting these characteristics, the values of the introduced inductors and capacitors are varied to investigate the spectrum changes of DNLHMs. Then, a series of controllable properties of the DNLHMs can be retrieved. And more importantly, the designed DNLHMs give the adjustability of suppressing high harmonics, which is not possible in the past materials.

Design and Analysis of Self-Collimation-Based Photonic Crystal Beam Splitter

2014 ◽  
Vol 887-888 ◽  
pp. 417-421
Author(s):  
Hong Jing Li ◽  
Li An Chen
Keyword(s):  
Photonic Crystal ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Beam Splitter ◽  
Practical Applications ◽  
Beam Splitters ◽  
Output Surface ◽  
Fdtd Simulations ◽  
Two Dimensional Photonic Crystal ◽  
Difference Time

We present a self-collimation-based beam splitter in a two-dimensional photonic crystal (2D-PC) by introducing defects near the termination. From the equi-frequency contour (EFC) calculations and the finite-difference time-domain (FDTD) simulations, we show that the defects can give rise to the splitting of self-collimated beams in 2D-PCs and the directivity of the deflected beam can be improved by the defect along the PC surface. In order to get different kinds of beam splitters, including the Y-shaped, one-to-three, one-to-four structures, and so on, we only need to modify the structure of the output surface (along X-M direction). The proposed splitter may have practical applications in integrated photonic circuits.

Finite-Difference Time-Domain Simulation of Microwave Sintering in A Variable-Frequency Multimode Cavity

1996 ◽  
Vol 430 ◽  
Author(s):  
Mikel J White ◽  
Steven F. Dillon ◽  
Magdy F. Iskander ◽  
Hal D. Kimrey
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Microwave Sintering ◽  
Single Frequency ◽  
Frequency Variation ◽  
Variable Frequency ◽  
Frequency Range ◽  
Fdtd Simulations ◽  
Difference Time

AbstractThere have been recent indications that variable-frequency microwave sintering of ceramics provides several advantages over single-frequency sintering, including more uniform heating, particularly for larger samples. The Finite-Difference Time-Domain (FDTD) code at the University of Utah was modified and used to simulate microwave sintering using variable frequencies and was coupled with a heat-transfer code to provide a dynamic simulation of this new microwave sintering process. This paper summarizes results from the FDTD simulations of sintering in a variable-frequency cavity. FDTD simulations were run in 100-MHz steps to account for the frequency variation in the electromagnetic fields in the multimode cavity. It is shown that a variable-frequency system does improve the heating uniformity when the proper frequency range is chosen. Specifically, for a single ceramic sample (4 × 4 × 6 cm3), and for a variable-frequency range from f = 2.5 GHz to f = 3.2 GHz, the temperature distribution pattern was much more uniform than the heating pattern achieved when using a single-frequency sintering system at f = 2.45 GHz.

Quantifying Sub-gridding Errors in Standard and Hybrid Higher Order 2D FDTD Simulations

2021 ◽  
Vol 35 (11) ◽  
pp. 1428-1429
Author(s):  
Madison Le ◽  
Mohammed Hadi ◽  
Atef Elsherbeni
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Contrast Ratio ◽  
Higher Order ◽  
Fdtd Simulation ◽  
Fdtd Simulations ◽  
2D Fdtd ◽  
Difference Time

Sub-gridding errors for a 2D Finite-Difference Time-Domain (FDTD) simulation are compared for both the standard FDTD and Hybrid higher order FDTD cases. Subgridding contrast ratios of 1:3, 1:9, 1:15, and 1:27 are considered and analyzed. A correlation is seen between the increase of contrast ratio with the increase of sub-gridding errors for both standard and hybrid cases. However, a trend of errors reduction when using hybrid formulations over standard formulations is apparent for each contrast ratio.

scholarly journals Finite-Difference Time Domain Techniques Applied to Electromagnetic Wave Interactions with Inhomogeneous Plasma Structures

2018 ◽  
Vol 2018 ◽  
pp. 1-20 ◽  
Author(s):  
Julio L. Nicolini ◽  
José Ricardo Bergmann
Keyword(s):  
Electromagnetic Wave ◽  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Inhomogeneous Plasma ◽  
Computational Cost ◽  
Transient Effects ◽  
Plasma Properties ◽  
Fdtd Simulations ◽  
Difference Time

Motivated by the emerging field of plasma antennas, electromagnetic wave propagation in and scattering by inhomogeneous plasma structures are studied through finite-difference time domain (FDTD) techniques. These techniques have been widely used in the past to study propagation near or through the ionosphere, and their extension to plasma devices such as antenna elements is a natural development. Simulation results in this work are validated with comparisons to solutions obtained by eigenfunction expansion techniques well supported by the literature and are shown to have an excellent agreement. The advantages of using FDTD simulations for this type of investigation are also outlined; in particular, FDTD simulations allow for field solutions to be developed at lower computational cost and greater resolution than equivalent eigenfunction methods for inhomogeneous plasmas and are applicable to arbitrary plasma properties such as spatially or time-varying inhomogeneities and collision frequencies, as well as allowing transient effects to be studied as the field solutions are obtained in the time domain.

Tailoring Metal and Insulator Contributions in Plasmonic Perfect Absorber Metasurfaces

2018 ◽  
Author(s):  
Yoshiaki Nishijima ◽  
Armandas Balcytis ◽  
Shin Naganuma ◽  
Gediminas Seniutinas ◽  
Saulius Juodkazis
Keyword(s):  
Electrical Conductivity ◽  
Optical Properties ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Perfect Absorber ◽  
Mid Infrared ◽  
Plasma Sputtering ◽  
Absorption Of Light ◽  
Fdtd Simulations ◽  
Difference Time

<div>Maximum absorption of light using plasmonic perfect absorbers (PPAs) is highly desired in the field of energy harvesting. We reveal how optical properties of several</div><div>popular metals and insulators are affecting performance of PPAs at mid-infrared (IR) wavelengths. Optical properties of experimentally prepared (by plasma sputtering) structures follow expected scalings, however, departure from the finite difference time domain (FDTD) simulations are significant when roughness of the first metal baselayer is not taken into account. Electrical conductivity is shown to strongly affect</div><div>performance of PPAs.</div>

High Resolution Position Monitoring of Suspended MEMS towards Biological and Chemical Sensors

2014 ◽  
Vol 1659 ◽  
pp. 9-14
Author(s):  
G. Putrino ◽  
M. Martyniuk ◽  
A. Keating ◽  
J.M. Dell ◽  
L. Faraone
Keyword(s):  
Time Domain ◽  
Chemical Sensors ◽  
Finite Difference Time Domain ◽  
Chemical Sensing ◽  
Light Transmission ◽  
Micro Electro Mechanical Systems ◽  
Accurate Position ◽  
Fdtd Simulations ◽  
Difference Time ◽  
Position Monitoring

ABSTRACTWe present an integrated readout technique for interrogating the suspension height of micro-electro-mechanical systems (MEMS) structures. This readout technique is envisaged to be useful in applications such as MEMS-based biological and chemical sensing, where it is necessary to obtain the accurate position of a MEMS beam. The approach is based on the suspended MEMS structure modulating light transmission in an underlying optical waveguide via Fabry-Perrot phenomena. The performance of the technique is predicted via finite difference time domain (FDTD) simulations the results of which are confirmed by experimental measurements.

Micro-Ring Resonator-Based Sensors for Detection of Different Chemicals

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Amna Bedi ◽  
Sonika Singh ◽  
Santosh Kumar ◽  
Brajesh Kumar Kaushik
Keyword(s):  
Refractive Index ◽  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Ring Resonator ◽  
Carbon Disulphide ◽  
High Sensitivity ◽  
Optical Field ◽  
Chemical Solutions ◽  
Difference Time

AbstractThe sensing of different liquids is investigated with micro-ring resonator (MRR) sensor by changing refractive index (RI) of chemical solutions. Aniline, carbon disulphide, chlorobenzene, chloroform, ethanol, glycerin, and methanol are detected using the proposed MRR. The developed structures are simulated using finite difference-time domain (FDTD) by using DFT analyzer of optical field. The normalized amplitude vs. wavelength is measured by changing RI of inner ring waveguide that obtain liquid sensor with high sensitivity.

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