D05 – Mode-Guided Infrared Absorption in Ge/SiO2 Grating for Large-Angle and Broadband Photodetection

Hsu C.-Y., Pei Z., Liu J.-M.

The numerical simulation of the electromagnetic properties of the Ge/SiO2 grating structure with bottom distributed Bragg reflector. With mode guiding in Ge, the structure exhibits an absorption angle of 100° and broadband behavior from 1300 to 1500 nm.

48

4

IS04 – All-optical AND Logic Gate Based on Semiconductor Optical Amplifiers for Implementing Deep Recurrent Neural Networks

Alam B., Ceschini A., Rosato A., Panella M., Asquini R.

The development of optical logic gates is a key factor for enabling next generation of computations in the context of Deep Learning and Quantum Computing. In this work, we introduce a scheme for the implementation of an all-optical AND logic gate, which makes use of semiconductor optical amplifiers (SOA) in cross-phase modulation configuration combined with […]

152

9

N03 – Band structures in highly strained 3D nanowires

Hadjimichael Y., Marquardt O., Merdon O., Farrell P.

We mathematically derive a new nonlinear strain model to simulate the conduction and valence bands in highly bent 3D hexagonal nanowires with GaAs core and asymmetric (AlαIn1-α)As stressor. The model is based on a transformation of the 1st Piola-Kirchhoff stress tensor and an appropriate energy functional that captures the dynamics of the induced strain due […]

88

7

IS08 – Flat-band 8-Channel Optical MUX/DeMUX for Long Reach 400GbE Applications

Jeong S.-H.

We propose novel optical demultiplexer scheme for LR-8 applications, and theoretically verify flatband spectral response with the discrete 8-channel wavelengths. By the additional band rejection filter, non-continuous wavelength filtering response was achieved with spectral flatness and low crosstalk of < -15dB within an entire LR-8 targeted spectral range.

55

4

P09 – 120° Hybrid for Bimodal Interferometers

An 120° hybrid for bimodal interferometers in the 220 nm silicon-on-insulator technology is presented. Three output signals enable an unambiguous phase detection over a 360°-range as well as a constant sensitivity. The length of the hybrid is only 190 µm with a simulated excess loss of 0.16 dB. Measurements combined with digital signal processing verify […]

160

2

LD07 – Physics-based time-domain modeling of VCSELs

D’Alessandro M., Gullino G., Tibaldi A., Bertazzi F., Goano M., Debernardi P.

This paper presents the results of a physics-based time-domain simulator for a vertical-cavity surface-emitting laser (VCSEL). We implemented a trapezoidal rule second order backward differentiation formula (TR-BDF2) to simulate the large signal response of the device under investigation, including the parasitic effects of the pin junction arising from an interplay of optical and carrier transport […]

117

7

MM09 – FiPo FDTD: Computational Electrodynamics Technique Producing Both Fields and Potentials

Avazpour L., King M., Belling S., Knezevic I.

We present the field–potential finite-difference time-domain (FiPo FDTD) algorithm, which solves a set of first-order equations for the electric and magnetic fields (E and H), as well as the magnetic vector potential A and the scalar electric potential φ in the Lorenz gauge. We also present the derivation and implementation of a convolutional perfectly matched […]

87

NM08 – Silicon-Based Plasmonic Nanoantennas at midinfrared for Gas Sensing Applications

Alsayed A. E., Ghanim A. M., Yahia A., Swillam M. A.

Advanced nanotechnology especially CMOS technology- enables us to re-design the classic antenna in the nanoscale, which can convert propagating optical wavelengths instead of radio and microwave wavelengths into localized energy and vice versa. As a result, sensors may be designed to make sensing molecules with their characteristic vibrational transitions easier. Bowtie silicon nanoantennas are investigated […]

82

7

LD10 – Effect of Self-Phase Modulation on The Signal Quality of Fourier Domain Mode-Locked Lasers

Aşırım O. E., Huber R., Jirauschek C.

In this paper, the impact of self-phase modulation on the noise performance of Fourier Domain Mode-Locked (FDML) lasers is investigated. It is shown that under a relatively high fiber nonlinearity and/or intracavity signal amplitude, an excess amount of noise generation occurs, which can not only lead to poor signal quality, but also operational instability. Hence, […]

78

7

P23 – Nanoplasmonic Ultra Compact, Low Insertion Loss UWB Band-Pass Filter Using Square Ring Resonators

Thirupathaiah K., Rao L. K., Boda R.

This article presents the design and analysis of a nanoplasmonic ultra wide band (UWB) band-pass filter based on metal insulator metal (MIM) slot-waveguide using three square ring resonators (SRRs) for obtaining ultra wide band nature at optical frequencies. This filter shows the low insertion loss due to the zero coupling gaps and no mismatch between […]

96

5

SC04 – Performance Evaluation of Lead-Free Cs2CuSbCl6 Perovskite Solar Cells for > 21.67% Efficiency

Kumar A., Thomas M. S., Gupta N., Jain A.

This work investigates the performance of Cs2CuSbCl6-based lead-free perovskite solar cells for photovoltaic applications. Cs2CuSbCl6 has a bandgap of 1.7eV and it is a durable and non-toxic material. Cs2CuSbCl6 can absorb more photons and thus obtain high efficiency. This work has been performed using SCAPS-1D software with the focus on optimizing the absorber layer thickness […]

160

7

IS14 – Tunable optical mode converter based on SOI asymmetric channel waveguides

Younis B. M., Esamil M. S. M., Hameed M. F. O., Obayya S. S. A.

An optical mode converter based on asymmetric dual channel waveguides is reported and analyzed. The first channel is infiltrated with nematic liquid crystal (NLC) material while the second one has BK7 glass core. The first higher order mode of the NLC core is coupled to the fundamental mode of the neighboring core with high coupling […]

63

6

D03 – 3D multiphysics transient modeling of vertical Ge-on-Si pin waveguide photodetectors

Alasio M. G. C., Franco P., Tibaldi A., Bertazzi F., Namnabat S., Adams D., Gothoskar P., Masini G., Forghieri F., Ghione G., Goano M.

We report transient simulations of Ge-on-Si vertical pin waveguide photodetectors (WPDs), where the optical generation term used by the time-domain model is the FDTD solution of the electromagnetic problem treated as a spatially-distributed pulsed signal. This approach, validated against experimental measurements of the frequency response, paves the way to future studies of the dynamic response […]

122

2

NM15-Performance Optimization of Surface Plasmon Resonance based Sensors from the First Principle

Kushwah H., Anand J. K.

Performance optimization of surface plasmon resonance (SPR) based sensors due to improvement in input optical coupling is theoretically investigated from the first principle. Various design parameters are optimized in a typical prism coupling Kretschmann configuration.

66

2

LD13 – Numerical Analysis of Electrically Pumped SiGeSn/GeSn Quantum Well Transistor Laser

Ranjan R., Pareek P., Malviya N.

The threshold current density of electrically pumped Sn incorporated group IV alloy based transistor laser (TL) is analyzed by proposing and designing a theoretical model for the same. Active region for the lasing action is formed by strain compensated GeSn single quantum well (QW) in the base of the transistor. The threshold current density for […]

73

7

NM01 – Machine Learning Assisted Material and Device Parameter Extraction From Measurements Of Thin Film Semiconductor Devices

Knapp E., Battaglia M., Jenatsch S., Ruhstaller B.

The simulation of thin film semiconductor devices is challenging, partly due to the unknown material and device parameters. In this contribution, we present two different approaches to determine the missing material and device parameters from measurements. They both have in common that they are based on machine learning (ML) and numerical models. First, a numerical […]

154

12

SC02 – Numerical simulation of eco-friendly 4-terminal all perovskite tandem solar cell using novel HTL structure in the bottom sub cell

Moradbeigi M., Razaghi M.

In this paper, we proposed a free-pb 4-terminal (4T) all perovskite tandem solar cell (APTSC) as reference with the power conversion efficiency (PCE) of 26.42% . First, a 100 nm MgF2 thin film is used as an antireflection layer (ARL) of the top sub cell to improve the total PCE of the reference structure. The […]

187

14

NM14-Mid-infrared optical modulator based on D-shaped PCF

Younis B. M., Yazeed N., Usama E., El-Sayed B., Almoqadem M. H., El-Sonbaty M. A., El-Shawadfy A., Abd-Elaziz A., Mahmoud S., Hameed M. F. O.,

Recently, photonic crystal fibers (PCFs) have become of compelling interest due to their diverse applications, especially in the mid-infrared (mid-IR) wavelength regime. In this work, an optical mid-IR modulator based on D-shaped PCF with germanium-antimony-tellurium (GST) as a phase-changing material (PCM) is presented and analyzed. Because of the phase transition of the GST material between […]

100

2

P16 – Plasmonic Dual D-shaped PCF Sensor for Low Refractive Index Applications

Gamal Y., Younis B. M., Hameed M. F. O., Obayya S. S. A.

Dual D-shaped (DD-shaped) plasmonic photonic crystal fiber (PCF) for refractive index sensing is designed and analyzed. In the proposed design, two gold nano-rods are attached to the two etched surfaces of the PCF to enhance the sensing characteristics. The surface plasmon (SP) modes excited at the metal/dielectric interfaces are strongly coupled to the PCF core […]

178

5

P21 – Numerical investigation of optical bistability in inhomogeneous PT -symmetric gratings

Sudhakar S., Vignesh Raja S., Govindarajan S.

Customizing the nonlinear profile along the direction of propagation helps in the realization of low-power all-optical switches. The switching intensities are extremely low (<0.01) in the broken regime provided that the light launching direction is right. It is believed that the switching intensities in the broken regime are always higher than that of the unbroken […]

129

2

LD15 – Design Analysis of Linear Graded Quantum barriers in Ultravoilet-C Laser Diodes

Ali S., Usman M., Saeed S.

We demonstrated ultraviolet laser diode with improved optical and electrical features. By employing linear graded rising aluminium concentration in phases from first quantum barrier to last quantum barrier, the suggested LD design improves internal quantum efficiency (IQE) and output power while minimizing the lasing threshold. The proposed LD increases optical gain while lowering carrier leakage […]

101

2

MM03 – Implementation of Partially Reflecting Boundary Conditions in the Generalized Maxwell-Bloch Equations

Schreiber M., Popp J., Seitner L., Haider M., Jirauschek C.

Perfectly matched layer (PML) boundary conditions have been used for several decades for the simulation of open domains within the finite difference time domain (FDTD) method. In this paper, we report on a new PML-based partially reflecting boundary condition for the generalized Maxwell-Bloch equations that enables setting a certain value of reflectance R at the […]

106

3

SC01 – Built-in electric field in irregular morphologies of bulk-heterojunction solar cells

Flores-Contreras I. C., Cabrera-Arenas V., Reséndiz-Mendoza L. M.

This paper theoretically analyzes the built-in electric field distribution in bulk heterojunction solar cells. The approach proposed leads to explore the impact of regular and irregular morphologies on the performance of these devices. The width of the depletion region at the donor-acceptor interface is set by the doping concentration. The proposed analysis resulted in the […]

99

11

IS11 – Numerical Investigation of the Performance of OAM-Mode Shifting Recirculating Delay Loop Under the Effect of Mode Shifter Displacement

Almaiman A.

We investigate the effect of OAM mode shifter displacement on the performance of the OAM-mode shifting recirculating delay loop by simulating the beam propagation using Kirchhoff-Fresnel diffraction. Simulation results indicate that 20 delayed replicas may be obtained with >10 dB signal-to-crosstalk ratio (SCR) if alignment is perfect and ℓshift=+1

35

P15 – Numerical simulation of silicon grating-based plasmonic sensor

Kumar Pandey A., Kumar H.

This work reports on the application of silicon grating-enabled nanostructure for refractive index sensing application in the near-infrared region. This grating helps in launching the plasmon modes efficiently towards the flat metal film deposited with a thin Al2O3 layer. The normal incidence light is used which can be helpful for its integration with optical fiber. […]

99

5

IS02 – Exploring modern alternatives to the Whittaker-Shannon-Nyquist sampling theorem in THz Spectroscopy

Andersen C. D., Noura J. A. S., Mølvig B. H., Garcia O. G., Lange S. J.

We present simulations for a THz cross-correlation spectroscopy (THz-CCS) optical system. The aim is using compressed sensing (CS) to reconstruct the THz signal from a random under sampling of the signal and potentially replacing a delay stage unit of the THz-CCS system to increase robustness and cost-effectiveness of the optical system. We present results from […]

66

P18 – The counter-propagating traveling-wave technique for optimizing a continuous-wave fiber laser presenting excited state absorption

Barmenkov Y. O., Aboites V., Minguela-Gallardo J. A.

We report results of simulation of a continuous-wave fiber laser with active medium presenting an excited state absorption. The laser was simulated using the counterpropagating traveling-wave technique with taking into account two laser waves propagating along the laser cavity in opposite directions, two waves of amplified spontaneous emission, and exited state absorption observed for both […]

63

NM13-Highly sensitive ring resonator based refractive index sensor for label free biosensing applications

Kundal S., Khandelwal A.

Ring resonator based label free refractive index biosensor is proposed for detecting glucose and hemoglobin concentrations. To improve device sensitivity and Q factor, various parameters of ring resonator are optimized. The designed ring resonator sensor can sense hemoglobin and glucose concentrations with a high sensitivity of 424 nm/RIU and Q factor of 802.

339

26

NM07 – Early Cancer Detection by Plasmonic PCF Sensor

Abdelghaffar M., Gamal Y., Soliman W., Badr Y., Hameed M. F. O., Obayya S. S. A.

Great research work has been studied for cancer detection due to its high death rate. In this paper, a novel design of photonic crystal fiber (PCF) biosensor based on surface plasmon resonance (SPR) is introduced and numerically analyzed for cancer cell detection. Full vectorial finite element method (FVFEM) is used throughout the numerical analysis of […]

79

2

N04 – An Efficient Workflow of Modeling Single-Nanowire Based Single-Photon Avalanche Detectors

Li Z., Tan H. H., Jagadish C., Fu L.

Single-photon detector (SPD) as an essential building block for detecting and counting photons, plays a fundamental role in quantum technologies. In this work, we propose an efficient workflow of modeling SPDs based on emerging one-dimensional materials, i.e. nanowires, utilizing avalanche breakdown in reverse biased condition. Comparing to another extensively studied platform, superconducting nanowire SPDs, avalanche […]

56

2