MM02 – Carrier transport in (In,Ga)N quantum well systems: Connecting atomistic tight-binding electronic structure theory to drift-diffusion simulations

O’Donovan M., Farrell P., Streckenbach T., Koprucki T., Schulz S.

Understanding the impact of the alloy microstructure on carrier transport in (In,Ga)N/GaN quantum well systems is important for aiding device design. We study the impact that alloy fluctuations have on uni-polar carrier transport for both electrons (n-i-n junction) and holes (p-i-p junction) using a multiscale framework. To do so we connect an atomistic tight-binding model […]

136

10

N07 – DFT investigation of optoelectronic properties of ultra-small C, CN and SiC nanotubes

Takassa R., Elfatouaki F., Farkad O., Hassine O., Choukri O., El Mouncharih A., Ijdiyaou Y., Ibnouelghazi E. A., Abouelaoualim D.

We investigated the optoelectronic properties of ultra-small armchair (3,3) carbon (C), carbon nitride (CN) and silicon cabride (SiC) nanotubes using the density functional theory (DFT). We performed the calculations for two potentials Perdew-Burke-Ernzerhof Generalized Gradient Approximation (PBEGGA) and Tran-Blaha modified Becke-Johnson (TB-mBJ) potential. The results show a semiconducting nature with direct and indirect gap for […]

37

4

MM08 – Data-driven doping reconstruction

Piani S., Lei W., Heltai L., Rotundo N., Farrell P.

To reconstruct doping profiles via opto-electronic techniques (e.g. LBIC and LPS), we formulate an inverse problem based on the van Roosbroeck system. To solve it, we use neural networks fed with data created from efficient implementations of the forward model. We discuss errors of the reconstructed doping profiles as well as their robustness with respect […]

56

6

MM11 – The Variations of Photoluminscence Decay Times Under The Influence of A Trapping State

Chiu K. P.

We numerically calculated the time-resolved photoluminescence spectra using the bimolecular trapping-detrapping model. The variations of carrier lifetimes are investigated by changing the carrier recombination and trapping rate constants, as well as the concentration of available trapping states.

28

3

P20 – Simulation of Optical Planar Waveguide Sensor for Microplastics Detection in Water

Razali N. M., Saris N. N. H.

Nowadays, microplastics pollution has become a global concern as it endangers the ecology, marine animals, and cause health threats to human beings. This paper attempted to simulate an optical planar waveguide sensor for microplastics detection in water via Wave Optics Module-COMSOL Multiphysics®. The analyte refractive index was ranged from 1.4800 to 1.5000 RIU, in reference […]

62

3

P02 – Modal properties of dielectric bowtie cavities with deep sub-wavelength confinement

Kountouris G., Mørk J., Denning E., Kristensen P. T.

We present a quasinormal mode analysis of a dielectric bowtie cavity with deep sub-wavelength confinement. The cavity – which is based on an inverse design by topology optimization – exhibits a remarkable sensitivity to local shape deformations, which we show to be well described by perturbation theory.

85

5

N01 – Nanoscale confinement of light in topology-optimized silicon cavities

Stobbe S.

119

9

IS13 – Design and Performance Analysis of All Optical Half Adder based on Carrier Reservoir SOA -Mach Zehnder Interferometer (MZI) Configuration

Agarwal V., Pareek P., Singh L., Chaurasia V.

In this manuscript, Carrier reservoir SOA (CR-SOA) based half adder is proposed and simulated at 100 Gb/s. CR-SOA has fast carrier recovery, due to presence carrier reservoir which enables its use at higher data rates on the other hand conventional SOA suffers from slow carrier recovery which leads to unequal amplification of pulses. The obtained […]

41

6

LED05 – Reliable prediction of the singlet-triplet gap in TADF molecules with GW/BSE approach

Chaudhuri D., Patterson C. H.

Organic light emitting diode (OLED) molecules that exhibit thermally activated delayed fluorescence (TADF) have emerged as a promising technology for various lighting and display applications. Such systems depend on low singlet-triplet gaps of the order of kT to allow reverse inter-system crossing. Here, we demonstrate the capability of a GW/BSE method to predict excitation energies […]

35

LD03 – Numerical Analysis of High-Brightness Tapered Ridge-Waveguide Lasers

Koester J.-P., Wenzel H., Wilkens M., Knigge A.

In this work, we present a simulation-based analysis of a CW driven tapered ridge-waveguide laser having a high lateral brightness of 5 W · mm−1mrad−1 at 2.5 W optical output power.

196

12

P06 – Flexible, Process-Aware Compact Model of Effective Index in Silicon Waveguides for Commercial Foundries

James A., Wang Y., Rizzo A., Bergman K.

We report the performance of a compact model for the effective index of SOI wire waveguides, showing exceptional agreement with simulated effective index and confinement factors. The development of such a model represents a potential pathway toward better modeling of silicon photonic devices in commercial foundry processes.

42

6

NM02 – Impact of random alloy fluctuations on the electronic and optical properties of c-plane AlxGa1−xN/AlN quantum wells

Finn R., Schulz S.

We present a theoretical study of the electronic and optical properties of c-plane AlxGa1−xN/AlN quantum wells emitting in the ultraviolet-A (UV-A) to UV-C spectral range. Special attention is paid to the impact of alloy fluctuations on the results. We find that random alloy fluctuations in (Al,Ga)N are already sufficient to cause strong carrier localization effects. […]

93

9

LED04 – Development of time-dependent Exciton diffusion solver for modeling Triplet-Triplet Fusion Mechanism in OLEDs

Huang J.-Y., Hung H.-C., Hsu K.-C., Chen C.-H., Lee P.-H., Lin H.-Y., Lin B.-Y., Leung M.-K., Chiu T.-L., Lee J.-H., Wu Y.-R.

In this work, we developed a both stable and time-dependent exciton diffusion model including singlet and triplet exciton coupled with a modified Poisson & drift-diffusion solver to demonstrate the mechanism of triplet-triplet fusion (TTF) OLEDs. Using this modified simulator, we can demonstrate the characteristics of OLEDs including current-voltage curve, quantum efficiency performance, time-resolved electroluminescence spectrum, […]

56

P10 – Ultraviolet and Infrared Blocking Meta-glasses for Electric Vehicles

Chowdhary A.K., Bhowmik T., Gupta J., Sikdar D.

The air-conditioning systems installed in electric vehicles (EVs) consume a significant portion of battery power, thus, limiting EVs’ operating mileage. A design of an automobile windshield that can passively control the heat and light transmitted through it, could improve EV’s performance by reducing the need for air-conditioning. Here, we present a ‘meta-glass’ coating design that […]

42

6

LED09 – Enhanced optoelectronic properties of UV-C light-emitting diode

We numerically analyzed proposed structure named as LED S2 in comparison to reference structure LED S1. In LED S2 we introduced undoped AlGaN and p-AlGaN layers between the electron blocking layer (EBL) and the p-GaN (hole injecting layer). The simulation finding shows proposed structure (LED S2) provide a better strategy for lowering electron overflow and […]

51

3

P08 – Tunable Guided-mode resonance filter using Spacetime Periodic Structure

Khorrami Y., Fathi D., Razmjooei N., Rumpf R. C.

We present a tunable planar guided-mode resonance (GMR) filter using time-varying permittivity along grating nanobars. Results show that the effective medium concept in the temporal state is exactly the same as the spatial state. Furthermore, the structure has spatial periodicity to save the resonance peak of the passive GMR in addition to the temporal periodicity […]

73

2

MM06 – Dual-Potential Finite-Difference Technique for Computational Electrodynamics

, , ,

We present a finite-difference time-domain (FDTD) technique suitable for coupling with quantum-transport solvers. We derive first-order equations for the electric and magnetic vector potentials and the electric scalar potential which, upon the adoption of the Coulomb gauge, decouple into solenoidal and irrotational equation sets and are sourced by the solenoidal and irrotational parts of the […]

33

N08 – Inverse Design of Multilayer Thin film by Deep Neural Network

Kumar P., Mihret F., Mishra A., Shivaleela E. S., Srinivas T.

Inverse Design of TiO2 − SiO2 based multilayer thin film for normal incidence of TM polarized light in visible region by Deep Neural Network is reported. The simulated and the target transmission spectra are closely following.

62

11

NM11 – Highly Efficient and Novel Lumped Michelson Modulator using Vertical PN junction based Phase Shifter

Hamdani M. A., Qazi G., Naik S. K., Sugesh R. G. J., Magray M. A.

Vertical PN depletion phase shifter based novel Common Mirror Michelson Modulator is proposed. It has a lower V, higher ER for a particular value of source impedance at a given bitrate and doping than conventional PN phase shifter based modulator.

56

7

NM12 – Design of Slot Waveguide based Directional Coupler for Optical Sensing of low concentration of Ethanol in Water

Malviya N., Ranjan R., Pareek P.

In this study, sensing of low concentration (0-10%) of ethanol in water is presented by refractive index sensing by silicon slot waveguide-based direction coupler. The significance spectral variation and sensitivity is observed to detect low concentration of ethanol in water.

52

4

LD05 – Data-Driven Modeling of Non-Markovian Noise in Semiconductor Lasers

Mertenskötter L., Kantner M.

Non-Markovian noise degrades the coherence properties of semiconductor lasers and contributes significantly to broadening of the linewidth. Since modeling of such colored noise systems from first principles is not accessible, we aim for a data-driven modeling approach in which a system of stochastic rate equations shall be reconstructed from time series data.

69

4

D01 – Non-Uniform Time-Stepping For Fast Simulation of Photodetectors Under High-Peak-Power, Ultra-Short Optical Pulses

Simsek E., Anjum I. Md, Carruthers T. F., Menyuk C. R.

A novel non-uniform time-stepping procedure is developed to reduce the memory usage and simulation time—by two orders of magnitude—of photodetectors when detecting high-peak-power, ultra-short optical pulses. The proposed procedure can be used in other marching-on-in-time solvers to achieve the same for the simulations dealing with ultra-short pulses.

86

6

P22 – Dynamics of colliding Bragg solitons in a dual-core system with separated grating and cubic-quintic nonlinearity

Anam N., Atai J.

We investigate the collisions of counterpropagating Bragg solitons in a dual-core optical coupler where one core has cubic-quintic nonlinearity and is coupled to another linear core equipped with a uniform Bragg grating. The outcomes of the collisions are diverse and exhibit rich dynamics.

38

LED06 – Ray Tracing Simulation of a GaN-based integrated LED-Photodetector System

Amiri P., Casals O., Auf der Maur M., Prades J. D.

An optical sensor system consisting of a pair of GaN LED and Photodetector (PD) is simulated using COMSOL Multiphysics, and the possibility of using this system as absorption coefficient sensor is studied. By locating both LED and PD on a same substrate and measuring transmitted power to the PD, it would be possible to sense […]

94

9

P11 – Numerical Study of Stimulated Brillouin Scattering in Optical Microcavities Made of Telecommunication Fibres

Kosareva A., Alyukova V., Salnikov N., Kalinin N.

We numerically studied stimulated Brillouin scattering processes up to the 5th order is microcavities with various realistic diameters and Q-factors made of standard telecommunication fibres. Pump power thresholds were simulated for different parameters of the system. The  larger the microcavity and lower Q-factors, the higher pump power thresholds are. It is also shown that thresholds […]

67

4

NM05 – Modeling the Effects of Surface Recombination Velocity in Scanning Photocurrent Microscopy for Ohmic-Contact Thin-Film Devices

Wei Y.-C., Mao M.-H.

We studied numerically the carrier transport and confirmed the feasibility of our scanning photocurrent microscopy model in the minority carrier decay length extraction under different surface recombination velocities at the surfaces of ohmic-contact thin-film devices.

91

2

LED08 – Influence of Prestrained Graded InGaN interlayer on the Optical Characteristics of InGaN/GaN MQW-based LEDs

In this work, an InGaN/GaN multi-quantum well light emitting diode is designed with different kinds of prestrain layers (InGaN) inserted between the active region and n-GaN layer to demonstrate the effects of piezoelectric polarization on GaN-based LEDs. The device describes a GaN buffer layer which promotes charge injection by minimizing energy barrier between electrode and […]

82

12

NM10 – One channel tunable bandpass superconducting filter for wavelength selective switching applications in communications systems

Gonzalez Reyes L. E., Segura-Gutierrez L. M., Ordonez J. E., Zambrano G., Reina J. H.

We design and evaluate the performance of optical filters that are built from one-dimensional photonic crystals (PhCs) amenable for integration into optical networks based on wavelength division multiplexing (WDM). The photonic heterostructures comprise the integration of a ferroelectric (BaTiO3), a dielectric (Y2O3), and a critical high-temperature superconductor material (YBa2Cu3O7−X) in between. Such nanosystems can allow […]

32

3

D07 – Theoretical study of back-to-back avalanche photodiodes for mid- and longwave infrared applications

Manyk T., Majkowycz K., Rutkowski J., Martyniuk P.

The dual-band N+-p-p-p-P+-p-p-p-n+ avalanche photodiode (APDs) structure is designed and numerically analyzed in detail. We conducted a theoretical study of APD for medium wave (MWIR) and longwave infrared (LWIR) applications. The current-voltage (I-V) characteristics for the bias range -6V

66

1

NM09 – Calculation of intersubband absorption in n-doped BaSnO3 quantum wells

Stanojević N., Radovanović J., Vuković N.

In this work we explore novel and promising BaO/BaSnO3 perovskite-oxide quantum well material system which has recently attracted attention due to its many advantages and possible applications in electronic devices. We focus on calculation of intersubband absorption in La-doped BaSnO3 quantum wells and investigate the tuning of absorption spectra with QW thickness and external electric […]

202

3