Structure Design Guide
Before a simulation, structure design fixes what the stack is made of — the incident and exit media, the substrate, and the layers that provide anti-reflection, high-reflection, filtering, or beam-splitting — and turns the design goal into a computable multilayer arrangement. This article maps those decisions to the app's structure page and collects external tutorials you can open and learn from directly.
Chapter Scope
| Decision target | Key question | Structure-page counterpart |
|---|---|---|
| Incident/exit media and substrate | Transmission window, reference index, environmental and mechanical limits | Top/bottom semi-infinite media and the substrate layer material |
| Functional coating layers | Anti-reflection, high-reflection, metallic, or filter stack | Material, thickness, and stacking order of each layer |
| Beam-splitting devices | Split ratio, polarization, and angle-of-incidence dependence | Partial-reflector stacks and plate/cube/wedged geometry |
Incident/Exit Media and Substrate
The substrate is the mechanical carrier for the coating and sets the usable transmission window; its refractive index is the reference baseline for anti-reflection and high-reflection design. In simulation, the top/bottom semi-infinite media and the substrate layer together fix the boundary conditions of the whole stack, so settle them first.
Functional Coating Types
Functional layers fall into four design goals: anti-reflection coatings lower interface reflection; dielectric high-reflection coatings build a high-reflectance band from quarter-wave stacks; metallic mirrors give broadband reflection; filters transmit or reflect selected bands. Each maps to a specific multilayer thickness-and-material arrangement.
Beam-Splitting Devices
A beamsplitter is a partial-reflector thin-film device that reaches a target split ratio by controlling stack reflectance; its polarization and angle dependence come from the Fresnel response of the layers and the device geometry (plate, cube, wedged).
External Learning Resources
Authoritative external optical tutorials and design guides, grouped into general introductions and specific design goals. Open them to learn the structure-design points above.
General Coating Design
- Optical Coating Capabilities (Thorlabs) — Overview of coating types (anti-reflection, dielectric/metallic mirrors, filters) with the design considerations that map a multilayer stack to a real device.
- Optical Substrates (Thorlabs) — Transmission ranges and optical/mechanical properties of common substrate materials (fused silica, N-BK7, CaF₂, ZnSe).
- Beamsplitter Guide (Thorlabs) — Comparison of beamsplitter types and their coatings.
- An Introduction to Optical Coatings (Edmund Optics) — Application note on coating theory and deposition technologies.
- Optical Coatings (Newport) — Technical overview of coating types and performance metrics.
- Thin Films (HyperPhysics) — Basic thin-film interference physics, suitable as a starting point.
By Design Goal
| Design goal | Authoritative guide |
|---|---|
| Anti-reflection | Anti-reflection Coatings (RP Photonics) · AR Coatings (Edmund) |
| High reflector / DBR | Dielectric Mirrors (RP Photonics) · Bragg Mirrors (RP Photonics) · Supermirrors (RP Photonics) |
| Filters | Optical Filters (RP Photonics) · Optical Filters (Edmund) · Semrock · Alluxa Learning Center |
| Splitting / polarization | Dichroic Mirrors (RP Photonics) · Thin-film Polarizers (RP Photonics) |
| Dispersion / chirped mirrors | Dispersive Mirrors (RP Photonics) |
| Solar photovoltaics | Anti-Reflection Coatings (PVEducation) |
| EUV / X-ray multilayers | Center for X-Ray Optics (CXRO) |
| IR material selection | Material for IR Applications (Edmund) |
Material Optical Constants
- refractiveindex.info — Database of refractive index n and extinction coefficient k for optical materials; check material dispersion before designing.
Next
Continue with Depth-Resolved Quantities and Structure Configuration.