Oral – Page 2 – NUSOD 2022

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, […]

P04 – Numerical modeling and experimental verification of advanced methods for characterization of broadband optical pulses and optical frequency combs

Andrianov A. V., Anashkina E. A.

We propose novel linear method for measuring ultrafast pulse trains with extremely high pulse repetition rates that are commonly generated in nonlinear microresonators. The method combines single-shot spectral interferometry with the reference pulses and an advanced version of the frequency resolved optical gating algorithm to reconstruct the initially unknown reference pulses.

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.

P17 – Simulation Analysis of Microring Resonator in Mobius Topology

Katti R., Prince S.

In this paper, a microring resonator in Mobius topology is modelled and simulation analysis is carried out. The free spectral range of this silicon-on-insulator based photonic device is found to be 23.4 nm. This structure of microring resonator finds place in various applications such as sensors, polarization analysis, wavelength-selective reflectors.

LD04 – Modeling carrier transport in mid-infrared VCSELs with type-II superlattices and tunnel junctions

Torrelli V., Montoya J. A. G., Tibaldi A., Debernardi P., Simaz A., Belkin M. A., Goano M., Bertazzi F.

Vertical-cavity surface-emitting lasers are promising light sources for sensing and spectroscopy applications in the midinfrared 3 ÷4 µm spectral region. A type-II superlattice active region is used for carrier injection and confinement, while a buried tunnel junction defines a current aperture, decreasing the series resistivity. Highly nanostructured to optimize device performance, mid-infrared VCSELs pose modeling […]

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P05 – Tunable and Compact SiP Quasi-Dichroic Filter with ≥10 dB/nm Roll-Off Across C- & L-bands

Novick A., Wang S., Rizzo A., Parsons R., Jang K., Bergman K.

We report simulated performance for an integrated and compact silicon photonic quasi-dichroic filter with ≥10 dB/nm roll-off and ≥20 dB extinction ratio between pass and stop bands. Additionally, the cutoff wavelength and compensation for fabrication error are each thermally tunable. The functional dichroic bandwidth is ≈80 nm, which spans most practical use cases.

LD01 – Steady states in dynamical semiconductor laser models and their analysis

Radziunas M.

We present an algorithm for calculating steady states in the dynamic PDE model for SLs admitting gain compression, spatial hole burning, and multilevel carrier rate equations. Presented example simulations rely on 1(time)+1(space)-dimensional traveling-wave- and Lang-Kobayashi-type models.

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IS03 – Polarization-randomized gateway against detector-blinding hacks of quantum key distribution

Hegazy S. F., Obayya S. S. A., Saleh B. E. A.

A quantum key distribution system –employing a key time-bin qubit and a security-pass polarization-randomized qubit– is shown to overcome a wide class of intercept-resend attacks adopting the use of faked-state light; including attacks based on blinding of single-photon avalanche detectors (SPADs).

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.

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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, […]

D02 – Electro-Optical Simulation and Characterization of DCR and secondary emission in SPADs

Novakovic B., Raymond K., Gallina G., Xie L., Retiere F., McGuire D.

We demonstrate the use of simulations in the modeling and characterization of important aspects of Single Photon Avalanche Detectors (SPADs). Electrically, we discuss the use of drift-diffusion and avalanche triggering probability solvers and results for dark count rate (DCR) and their comparison to measurements. Optically, we discuss the use of full wave electromagnetic solvers to […]

IS07 – OFDM Transmission using a Self-seeded ring Cavity based on a Semiconductor Optical Amplifier

This paper discusses the transmission of optical Orthogonal Frequency-Division Multiplexing (OFDM) format modulation in a resonant cavity based on a Semiconductor Optical Amplifiers Fiber Cavity Laser (SOA-FCL). The OFDM Subcarriers are configured and transmitted to fit the Cavity Resonance Modes (CRM). As a result, the authors show a novel principle of OFDM transmission in a […]

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.

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.

NM06 – Modelling an Acousto-Optic Beam Shaping Device for a DIRCM Laser Laboratory Setup

Keski̇n M. Z., Fi̇gen Z. G., Özdür İ. T.

Directed Infrared Counter Measure (DIRCM) laser laboratory setups are used to mimic the real life DIRCM system and IR heat-seeking missile engagement scenarios in isolated laboratory environments. Typically, the output beam of a mid-infrared (Mid-IR) laser source is modulated in time using an acousto-optic (AO) modulator (AOM). Following the AOM in the optical path, within […]

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 […]

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 […]

N02 – Influence of random alloy fluctuations on the electronic properties of axial In(x)Ga(1−x)N/GaN nanowire heterostructures

Marquardt O., Koprucki T., O’Donovan M., Schulz S., Brandt O.

Compound semiconductor heterostructures such as quantum dots, nanowires, or thin films, are commonly subject to randomly fluctuating alloy compositions if they contain ternary and quaternary alloys. These effects are obviously of an atomistic nature and thus rarely considered in heterostructure designs that require simulations on a continuum level for theory-guided design or interpretation of observations. […]

P01 – Continuous-Wave Second-Harmonic Generation in Orientation-Patterned Gallium Phosphide Waveguides at Telecom Wavelengths

Pantzas C., Combrié S., De Rossi A., Léger Y., Grisard A., Sagnes I.

A new process to produce Orientation-Patterned Gallium Phosphide (OP-GaP) on GaAs with almost perfectly parallel domain boundaries is presented. Taking advantage of the chemical selectivity between phosphides and arsenides, OP-GaP is processed into suspended shallow-ridge waveguides. Efficient Second-Harmonic Generation from Telecom wavelengths is achieved in both Type-I and Type-II polarisation configurations. The highest observed conversion […]

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 […]

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

Stobbe S.

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