NM03–Tight binding simulations of tetragonal MAPbI3 domains within orthorhombic phase

Di Vito A., Pecchia A., Auf der Maur M., Di Carlo A.

Very recent photoluminescence studies, investigating the tetragonal-to-orthorhombic phase transition of MAPbI3, demonstrated the presence of residual tetragonal phase far below the transition temperature, yielding spectral signatures from quantum confined tetragonal domains. We present a theoretical model of the coexistence of tetragonal and orthorhombic MAPbI3, based on tight binding simulations. The tight binding parameters are derived […]

135

9

LED06–Modeling of secondary optics LED aerodrome fires

Kvach Y.

The development of LED technology has allowed the Ukrainian Association of Lighting Enterprises of Vatra Corporation to develop the construction of LED equipment for the airfield light signal systems. Features of fire design, angles of installation of fires, difficulties in observing LED aerodrome fires – these factors influence the decision making when establishing visual contact. […]

42

MM05–Dynamic Response Prediction of Bi-State Emission of Quantum Dot Lasers Based on Extreme Learning Machine

Santos W.F.S., Simas Filho E. F., Thé G. A. P.

Dual-state emission is an phenomenon which takes place in Quantum Dot Lasers at different temperature and operating conditions. In this study, we investigate that issue from a nonlinear regression model based on Extreme Learning Machine, which revealed to be able to predict the spectrally resolved transient response of InAs/InGaAs quantum dot laser with error performance […]

78

4

N07–Short Pulses from QD Laser Excited State

Dogru N., Duranoglu Tunc S. H., Al-Dabbagh A. M.

 For the first time gain-switched short pulse generation with a width of 25-40 ps from excited state is demonstrated applying an external optical Gaussian beam to the excited state of InAs-InP-(113)B quantum dot laser.

88

4

P02–Quantum Information Interface on a Photonic Crystal Chip

Mertin P., Witzigmann B.

Quantum systems for information processing rely on the distribution of quantum information in a network. Lanthanide complexes coupled to an optical cavity can act as an interface between a stationary and a flying QuBit. Here we show that in such a system the stationary quantum information can be mapped onto a photon, paving the way […]

137

7

LD14pd–Optimization of Double-Circular-Hole Photonic-Crystal Surface-Emitting Lasers

Kuo C.-Y., Yang Z.-X., Lin G.

Photonic-crystal surface-emitting lasers (PCSELs) with double circular holes in the unit cell are optimized in terms of slope efficiency and single-mode stability. For PC-SELs with double-hole shift of one-fourth and one-third lattice constant, the area ratios of two holes are optimized separately and fall in completely different range; moreover, their threshold gain discrimination values are […]

58

D09–Near Infra-red Photosensor using Optically Gated D-MOS Vertical TFET

Vandana Devi W., Bhowmick B., Pukhrambam P. D.

This article reports a highly sensitive and low power photosensor using dual MOSCAP Vertical TFET for near infrared light detection in the wavelength range 0.7µm to 1µm. The optical voltage (VOP) developed because of the photogeneration occurring within the gate region enhances the gate control over the channel and produces higher drain current. The sensitivity […]

115

2

IS05–Modeling Material Susceptibility in Silicon for Four-Wave Mixing Based Nonlinear Optics

Höfler U., Kernetzky T., Hanik N.

We model the third-order material susceptibility chi3 in silicon waveguides for integrated optics. Analysis of four-wave mixing in these waveguides requires an in-depth study of material nonlinearity – in contrast to modeling light propagation in fibers with the optical nonlinear Schrödinger equation. We include electronic and atomic lattice (Raman) responses of the material and present […]

167

24

NM04–Strain-balanced GaAs(1-x)Bi(x)/GaN(y)As(1-y) W-type quantum wells for GaAs-based 1.3-1.6µm lasers

Davidson Z. C. M., Rorison J. M., Sweeney S. J., Broderick C. A.

Highly-mismatched alloys constitute a promising approach to extend the operational range of GaAs-based quantum well (QW) lasers to telecom wavelengths. This is challenging using type-I QWs due to the difficulty to incorporate sufficient N or Bi via epitaxial growth. To overcome this, we investigate a novel class of strain-compensated type-II QWs combining electron-confining, tensile strained […]

88

4

LD02–GaN-based bipolar cascade laser exceeding 100% differential quantum efficiency

Piprek J., Siekacz M., Muziol G., Skierbiszewski C.

Worldwide research efforts have been focusing on quantum efficiency enhancements of GaN-based light emitters. A promising approach is the separation of multiple active regions by tunnel junctions, enabling electron-hole pairs to generate more than one photon. Utilizing advanced numerical device simulation, we here analyze internal physics and performance limitations of such InGaN/GaN bipolar cascade laser […]

159

14

MM06–Numerical Prediction of Propagation Characteristics for Integrated Optical Couplers

Uebach D., Roth J. P., Kühler T., Griese E.

The field-assisted ion-exchange process for manufacturing integrated optical couplers is multivariate. For this reason, a precise prediction of the optical propagation characteristics of manufactured devices is needed. Two numerical calculation methods are compared with measured results for an integrated coupler to assess its applicability for a precise prediction.

113

5

N08–Dependence of conduction mechanism on bias and temperature in quantum-dot based electroluminescent devices

Rani S., Kumar J.

Quantum dots (QDs) provide some unique properties which make them preferable over other luminescent materials, one such property being adjustable and sharp emission which makes it an interesting candidate for electroluminescent devices. A QD based electroluminescent device has been taken into consideration in this theoretical study. The effect of the bias, temperature, the presence of […]

48

2

P03–Flat-Spectral-Band Filter for Fabrication Tolerance and Wideband Spectral Range

Jeong S.-H.

Novel scheme for silicon-wire type flat-topped wavelength filter is proposed and theoretically verified. Multimode interference couplers with symmetric and asymmetric splitting ratios used in a delayed interference type filter made filtering spectra flat over wide wavelength range of >80 nm with potentially better production yield

70

3

IS12pd–Modelling of mid-IR on-chip Doppler FMCW LiDAR System

Tian Y., Voskerchyan V., Soares F. M., Diaz-Otero F.

We propose a generic model that can simulate the functioning of doppler LiDAR system from given target speed, working distance and modulation pattern. Simulations confirm that our model yield system performance consistent with the theoretical calculations.

114

2

SC02–Machine Learning for Optimization of Mass-Produced Industrial Silicon Solar Cells

Wagner-Mohnsen H., Altermatt P. P.

We present a methodology where we combine numerical TCAD device modeling, machine learning and advanced statistics for getting a deeper understanding of how process variations influence device performance in mass produced crystalline silicon solar cells. For this, we use seven model input parameters that affect the mainstream solar cell design (PERC) and its performance the […]

145

7

IS06–Time Domain Numerical Study of Two Semiconductor Optical Amplifiers Laser Cavity Structures

El Hassanieh R., Morel P., Hamze M., Quintard V., Pérennou A., Sharaiha A.

In this paper, we develop a time domain model of a Semiconductor Optical Amplifiers Fiber Cavity Laser (SOAFCL). The time domain characteristics of two different cavity configurations (bidirectional and one-way cavity) are compared. The study shows that one-way cavity is less noisy compared to the bidirectional cavity which presents higher output power.

141

5

NM05–Modelling of mixed-phase MAPbI3

Nonni E., Rossi D., Auf der Maur M., Di Carlo A.

Both x-ray diffraction (XRD) and photoluminescence (PL) characterizations of methylammonium lead iodide perovskite (MAPbI3) reveal signatures of a coexistence of the tetragonal and orthorhombic phases over a wide range of temperatures, suggesting that the phase transition does not happen sharply at a temperature of 164 K as reported in literature. To understand the causes of […]

76

2

LD03–Thermal and optical simulation of InP on Si nanocavity lasers

Wen P., Tiwari P., Moselund K. E., Gotsmann B.

Accurate prediction of thermal effects is important for scaled photonic devices as excessive heating may lead to device failure. This paper addresses numerical modeling of thermal properties of InP nanocavity lasers on Si combined with optical simulations in Lumerical and lasing threshold measurements. Different geometries with diameters ranging from 200 nm to 2 µm are […]

137

5

MM07–Optimization of Two-Dimensional Photonic Crystals with Artificial Bee Colony Algorithm

da Silva M. G., Malheiros-Silveira G. N.

We applied the Artificial Bee Colony algorithm for the complete band gap maximization of a two-dimensional photonic crystal. The band diagram and band gap calculation were carried out by the software MIT Photonic Bands, and these results were used in the algorithm’s fitness function. The optimum structure was compared to the literature which used genetic […]

149

6

N09–Luminescence Decay Kinetics of Electron-Hole Plasma in II-VI Epitaxial Layers and Micropowders

Urmanov B. D., Leanenya M. S., Yablonskii G. P.

The luminescence decay kinetics of epitaxial layers of ZnSe and micropowders of ZnSe and CdS were measured at room temperature and at high levels of optical excitation. Comparison of the experimental results with the theoretically calculated decay kinetics showed good agreement for the initial moment of time at high concentrations of nonequilibrium charge carriers.

53

1

P04–Titanium Dioxide Waveguide Based Inverse Adiabatic Taper Coupler for Fiber-to-Chip Coupling

Mukit M., Mamun M., Stabile R., Calabretta N.

We present an efficient fiber-to-chip coupling method for polarization independent single mode titanium dioxide-TiO2 waveguide. The proposed inverse adiabatic taper coupler between a lensed fiber and waveguide consists of a spot size converter and allows coupling efficiency of around 85%.

279

11

IS13pd–6‑Channel Plasmonic Demultiplexer using Metal/Insulator/Metal Based Circular Resonators with Silver Nano Rods Arrays

Rakhshani M. R.

In this paper, we design and propose a compact 6-channel plasmonic demultiplexer (DMUX), utilizing of metal/insulator/metal (MIM) circular resonators (CRs) with metal nano‑rod arrays (NRAs). The resonance wavelengths of the output ports depend on the number of metallic NRAs in the CRs. For the numerical examination of the designed scheme, the finite‑difference time‑domain (FDTD) technique […]

40

2

SC03–Modeling Efficiency of InAs-Based Near-Field Thermophotovoltaic Devices

Forcade G., Valdivia C. E., Lu S., Molesky S., Rodriguez A., Krich J., St-Gelais R., Hinzer K.

Enormous potential lies in waste-heat recycling for the world’s industrial sector. Portable solid-state modules are a universal low-maintenance method to recycle this waste-heat. One such technology, near-field thermophotovoltaics (NFTPV), relies on a heat source in extreme proximity (<200 nm) to a photovoltaic cell, which then generates electricity. We developed an optoelectronic model where electron-hole pair […]

121

4

IS07–Analysis of Concentration Dependencies for an Optical Directional Coupler Design

Uebach D., Kühler T., Griese E.

An integrated directional coupler is designed for a bidirectional communication on a single waveguide by separating both data streams within individual branches. Thereby, an adjustment of the numerical aperture of the transmitting branch is a promising optimization approach. As the couplers are manufactured by a field-assisted diffusion process the numerical aperture is directly related to […]

52

2

NM06–Simulation aided design of a human wrist rotation recognition system combining IMU sensor data with Visible Light Communication

Zahiri-Rad S., Weiss A. P., Wenzl F. P., Leitgeb E.

Wrist worn mobile sensors have proven to be applicable for various applications, including fitness tracking or gesture recognition. In time- and security-critical application scenarios, the commonly used Radio frequency based communication technologies may pose a bottleneck for further advancements. In this work, we present a simulation environment implemented in Matlab/Simulink that enables the precise simulation […]

89

2

LD04–A multiscale approach for BTJ-VCSEL electro-optical analysis

Gullino A., Pecora S., Tibaldi A., Bertazzi F., Goano M., Debernardi P.

This paper presents a theoretical comparison of the electro-optical characteristics of 850 nm GaAs/AlGaAs pinand BTJ-based VCSELs. The calculations are based on a drift-diffusion model coupled with a NEGF formalism, able to model accurately the tunneling across the TJ. The resulting LIV characteristics demonstrate promising improvements, at both 25 and 80 ◦C, enabled by TJ […]

120

4

MM08–Controlling Nonlinearities in Semiconductor Superlattice Multipliers

Pereira M.F., Apostolakis A.

A hybrid approach combining Nonequilibrium Green’s Fuctions with solutions of the Boltzman equation, delivers voltage and intrinsic asymmetry control of nonlinearities in semiconductor superlattices. Unexpected nonlinear behavior is predicted for high harmonics as a result of voltage control.

51

D02–Performance of Plasmonic Side-Coupled Waveguide Photodetector with Varying Schottky Barrier Height

Ding Q., Schenk A.

 The impact of Schottky barrier height (SBH) on the performance of a side-coupled plasmonic waveguide photodetector (WGPD) is theoretically investigated by 3D optoelectrical simulations. A general decrease of the cut-off frequency is observed for all studied barrier heights (0.1 eV to 0.6 eV), most pronounced in the range (0.3 – 0.4) eV. The degradation is […]

110

1

P05–Implementation of a Digital Shadow for Fiber Bragg Gratings

Renner E., Haerteis L.-S., Rittler A., Schmauss B.

We propose a synthesis model for fiber Bragg gratings (FBGs) to monitor temperature measurement errors due to aging behavior. This approach might be called a Digital Shadow since we are able to monitor all essential parameters of the grating to perform error prediction and consequently compensation. The model is tested during accelerated aging experiments, which […]

114

12

IS14pd–Real-time Thickness Measurement with a Modified Sagnac Interferometer Using Phase Shift Technique

Usman A., Bhatranand A., Jiraraksopakun Y., Kaewon R., Pawong C.

The modified Sagnac interferometer with a phase-shift approach is given here for measuring Ta2O5 thin-film thickness. The input light is split into reference and sample beams. A real-time signal measurement is performed to get the output intensities of both beams with four different polarizer settings. These intensities can then be effectively converted into film thickness.

111

5