### 3D Charge Transport Solver

Engineers can significantly improve charge transport simulations across a range of applications with Ansys Lumerical CHARGE.

The set of equations defining electrostatic potential (Poisson’s equations) and density of free carriers is automatically self-solved by CHARGE (drift-diffusion equations).

In addition, CHARGE accommodates engineers with adaptive mesh generation based on doping, optical, and thermal profiles.

**Ansys Lumerical CHARGE**

Core Capabilities

Core Capabilities

**Transient Analysis**

- A user-specified time interval is used to compute the transient output variables in Lumerical CHARGE transient analysis section. A DC analysis can automatically determine the beginning conditions. All sources (such as power supply) that are not time-dependent are set to their DC value.
- Initial conditions are assumed at the start of the analysis rather than the outcome of the DC operating point analysis if Josephson junctions are present or if the UIC option is specified. All sources should start with zero output in Josephson junctions. The transient simulation can be run at each point over a variety of bias settings by combining transient analysis with a DC sweep.

**Transfer Function Analysis**

- The AC small signal transfer function, input impedance, and output impedance of a network are calculated by Lumerical HEAT’s transfer analysis section. The DC operating point for AC analysis is automatically calculated using an operating point analysis.
- Moreover, the transfer function can be estimated at each point over a variety of bias circumstances by combining the transfer analysis with a DC sweep.

**Pole-Zero Analysis**

- The poles and/or zeros in the small-signal AC transfer function are computed by the pole-zero analysis section of Lumerical CHARGE. All of the nonlinear components in the circuit’s linearized, small-signal models are then determined after the DC operating point has been calculated. The poles and zeros are then determined using this circuit. The transfer functions (output voltage)/(input voltage) and/or (output voltage)/(input current) are readily accessible for engineers to employ.
- The poles and zeros of functions like input/output impedance and voltage gain can be found using these two forms of transfer functions, which cover all circumstances. With resistors, capacitors, inductors, linear-controlled sources, independent sources, BJTs, MOSFETs, JFETs, and diodes, the pole-zero analysis can be applied.

**Small Signal AC Simulation**

- The AC output variables are calculated as a function of frequency by the AC small-signal section of Lumerical HEAT. The program initially calculates the circuit’s DC operating point before determining linearized, small-signal models for each of the circuit’s nonlinear components. The resulting linear circuit is next examined across a user-specified frequency range.
- Typically, a transfer function is the desired result of an AC small-signal analysis (voltage gain, transimpedance, etc). If there is just one AC input in the circuit, it is practical to set it to unity and zero phase such that the output variables have the same value as their transfer function to the input. A DC sweep and AC analysis can then be used in tandem to perform an alternating current analysis at each position under various bias conditions.

## Additional Ansys Lumerical Products

Lumerical software overview and core capabilities

**Ansys Lumerical FDTD**

**Simulation of Nanophotonic Devices**

- Q-factor Analysis
- Band Structure Analysis
- Flexible Material Plug-ins
- Cloud and HPC Capability
- 2D or 3D Model Simulation
- Full Vectoral Customization
- Far-field Projection Analysis
- Spatially Varying Anisotropy
- Custom Surfaces and Volumes
- Advanced Conformal Meshing
- Automated S-parameter Extraction

**Ansys Lumerical STACK**

*Optical Thin-Film Simulation*

- Plane-Wave Illumination
- Capture Interference Effects
- Capture Microactivity Effects
- Optical Thin-Film Application
- Accurate EM Simulation
- Dipole/Dipole Off-Axis Illumination
- Simulate Thin Film Multilayer Stacks
- Macroscopic Human Perception Analysis
- Rapid Photonics-Electronics Prototyping
- Pixel EPDA through Speos Integration
- Thick Layer Support ≥ Coherence Length

**Lumerical INTERCONNECT**

*Photonic Integrated Circuit Simulator*

- Transient Block Analysis
- Frequency Domain Analysis
- GUI and Lumerical Scripting
- Mixed Signal Representation
- Travelling Wave Laser Model
- Automatic Parameter Sweeps
- Multi-Variant Statistical Analysis
- Import Compact Libraries Models
- Electronic-Photonic Co-Simulation
- Transient Sample Model Simulator
- Multimode and Multichannel Support

**Ansys Lumerical MODE**

**Optical Waveguide & Coupler Solver**

- Overlap Analysis
- Bend Loss Analysis
- Helical Waveguides
- 2.5D varFDTD Solver
- Anisotropic Materials
- Advanced Conformal Mesh
- Spatially Varying Temperature
- Charge Density Profile Imports
- Finite Difference Eigenmode Solver
- Magneto-optical Waveguide Analysis

**Ansys Lumerical HEAT**

**3D Heat Transport Solver**

- Joule (J) Heating Solver
- Flexible Materials Database
- Automatic Mesh Refinement
- Finite-Element Meshing Automation
- Finite-Element Heat Transport Solver
- Steady-State and Transient Simulation
- Rapid Transition from 2D & 3D Solvers
- Self-Consistent Heat/Charge Transport
- Conductive, Convection & Radiative Effects

**Ansys Lumerical DGTD**

**3D Electromagnetic (EM) Simulator**

- Highly Interoperable
- Object-Conformal Mesh
- Material-Adaptive Mesh
- Gaussian Vector Beams
- Automation and Scripting
- Bloch Boundary Conditions
- Automatic Mesh Refinement
- High Order Mesh Polynomials
- Transitional 2D & 3D Modeling
- Far-field and Grating Projections

**Ansys Lumerical FEEM**

*Finite Element Waveguide Simulation*

- Frequency Domain Reflectometry
- Higher-Order Polynomial Functions
- Parallel Curved Meshing Adaptivity
- Electro-Optic Modeling Simulation
- Thermo-Optic Modeling Simulation
- Spatially Varying Index Perturbations
- Determine Effective Refractive Index’
- Fourier analysis for Signal Processing
- Material-adaptive Mesh Embedment
- Waveguide Thermal Sensitivity Tuning

**Ansys Lumerical MQW**

**Quantum Well Gain Simulation**

- Wavefunction Calculation
- Band Diagram Calculation
- Physics-Based Photonics Solver
- Quantum Mechanical Analysis
- Conduction Electron Scattering
- Gain and Spontaneous Emission
- Characterization of Band Structures
- Multi-Quantum Well Stacks Simulator
- Establish Controllable Quantum States
- Mesoscopic Superconductivity Analysis

**Ansys Lumerical Suite**

**Electronics Photonics Design Automation (EPDA)**

- Lumerical MODE
- Lumerical CHARGE
- Lumerical HEAT
- Lumerical DGTD
- Lumerical STACK
- Lumerical FEEM
- Lumerical MQW
- Lumerical VERILOG-A
- Lumerical INTERCONNECT
- Lumerical CML COMPILER

## Ansys Lumerical CHARGE In-Action

Supporting Ansys Lumerical CHARGE video materials showcasing functionality, and practical industrial application.

##### Merging Complex Geometries in Ansys CHARGE

##### Small-Signal AC and Transient Simulations in CHARGE