Photodiode and circuit design
Design of the photodiode and its readout circuit, both simulated with your device model to verify they meet the spec.
Engineering, documentation and 3D models for photonics
Optical and circuit design, EUV and DUV thin-film optics, and the datasheets, application notes, 3D models and drawings that support photonics components.
λ 13.5 nm
Extreme ultraviolet
Mo/Si multilayer mirrors and free-standing filters, modeled with CXRO data
EUV and DUV opticsServices
All servicesEUV and DUV optics
Multilayer mirrors and thin-film filters for 13.5 nm, 193 nm and 248 nm, modeled in the EUV Insight browser app.
Technical documents
Datasheets, application notes and test reports that give engineers the conditions and worked examples they need.
Tools, 3D models and sales material
Browser calculators, 3D models and drawings, sales material and trade show booths, plus market and competitor research.
EUV filter and multilayer mirror design
Design and modeling of thin films for 13.5 nm transmission and reflection: free-standing filters on their support mesh, and Mo/Si multilayer mirrors with the period and capping layer set for the required angle and bandwidth. Spectral purity modeling covers how much of the source’s deep-UV and infrared light passes the filters to the mask and wafer.
EUV Insight, a browser app for EUV thin films and multilayers built by Jezdan Gomez, is used to compare materials and thicknesses, run thickness tolerances and export spectra for reports and datasheets. DUV coatings and filters for 193 nm and 248 nm are also covered.
Multilayer stack and calculated reflectance spectrum
- R peak
- 73.80%
- Peak wavelength
- 13.49nm
- Bandwidth (FWHM)
- 0.622nm
- Total thickness
- 278.5nm
Values from the results panel in the screenshot, for a Ru cap on 40 Mo/Si bilayers with a 6.9 nm period on a Si substrate.
Photodiodes and readout electronics
Photodiode front-end design from the device model to the finished board: TIA configuration, bias and filtering, noise and bandwidth, and SPICE and MATLAB simulation with your photodiode as a device model to verify the circuit meets the requirements.
Deliverables continue through the KiCad schematic and PCB layout, the 3D model and a datasheet written from the same model and test data. Available as individual steps or as the complete chain.
PIN photodiode cross-section
Schematic and photodiode model
Photodiode design process
- Photodiode device modelMeasured responsivity, dark current, capacitance and shunt resistance become an equivalent circuit for simulation.
- TIA and readout circuitFeedback resistor and capacitor, op-amp choice, bias, bandwidth, noise gain and stability, worked out by hand first.
- MATLAB and SPICE simulationThe circuit runs with the device model across bias, temperature and part tolerances.
- Verification against requirementsEvery requirement gets a pass or a fail, with the simulation or measurement that backs it.
- KiCad schematic and PCB layoutSchematic and board in KiCad, with short input traces and a guard ring around the summing node.
- 3D modelA STEP model of the board and the photodiode package for your mechanical team.
- Datasheet and app noteDatasheet curves and an application note built from the same model and test data as the hardware.
From 13.5 nm EUV to 5 µm in the mid-infrared
Application notes, selection guides and datasheets, plus CAD and circuit design, for parts that work anywhere in this range.
EUV and DUV
For makers of multilayer mirrors, excimer optics and lithography subsystems: application notes on reflectance and layer tolerances, and datasheets for DUV coatings and CaF₂ optics. EUV Insight is the thin-film design tool for this band.
UV and visible
For laser, filter and microscope optics makers: selection guides that match filter sets to laser lines, datasheets that state their test conditions, and an AOI shift calculator for your filters.
NIR and SWIR
For diode laser, fiber and LiDAR optics makers: application notes on TEC control and wavelength drift, such as the TEC heat-load sample, product pages for telecom and LiDAR filters, and photodiode front-end circuit design.
MWIR
For IR material, lens and QCL makers: transmission and coating datasheets, and lens selection guides for germanium and chalcogenide glass.
Sample projects
Each sample cites its public references, and every figure and table in it is computed from code.
TEC control for laser wavelength stability
Application note, 8 pages, with a TEC heat load calculator.
Open the PDF (opens in a new tab)Optical filter selection guide
Selection guide and white-paper example, 10 pages, with optical density and angle shift calculators.
Open the PDF (opens in a new tab)Datasheet, before and after
A thin datasheet for a filter family, rewritten with its test conditions, typical values kept apart from limits, and curves drawn from code.
Open the PDF (opens in a new tab)EUV Insight is a browser app for optics engineers designing EUV thin films and multilayer optics.
EUV Insight workspace
euvinsight.com
Jezdan Gomez
Technical documents, browser calculators and circuit design, plus CAD files prepared from your released drawings.
How projects workVentura County, California
Industries served
Photonics and optics component makers, typically 20 to 400 people, that need application notes, product documentation or tools for selecting parts.
The same work suits makers of precision components in test and measurement, scientific instruments, motion and industrial automation.
- Filters and coatings
- Precision, molded and IR optics
- Polarization optics
- Laser modules, laser drivers and TEC controllers
- Fiber components
- Electro-optic and acousto-optic devices
- Photonic integrated circuits
- The optics of spectroscopy, imaging and metrology instruments
- Laser and broadband light sources
- Optomechanics and motion
Project packages
Start with one small project or a full kit. Every price is agreed before work starts.
Smaller projects
A capability card, a datasheet refresh, a technical article or a product-page rewrite.
App Note Sprint
One application note with a worked example and supporting calculations.
Product Launch Package
Datasheet refresh, product page, technical article, three posts and the launch email, timed to your launch.
Design-In Kit
Application note, selection guide, a design calculator, a sales one-pager and a technical FAQ.
Request a quoteRecommended
Monthly retainers are available for ongoing documentation and calculator work.
Trade show, print and marketing design
Technical content written and checked for booths, banners, brochures, catalogs and booklets, with design by Pento Agency (opens in a new tab), who designed and built this site. One point of contact from the brief to the print-ready files.
10 × 10 ft inline trade show booth
Product photography
See the galleryMacro photographs of optical and electronic parts on white, for datasheets, product pages, catalogs and trade-show graphics.
Gold can with a wide window over a large round die on a green substrate 
Gold-plated flange-mount can with a round window and long gold leads 
Ceramic chip carrier with a 4 × 4 die array and gold wire bonds 
Gold-plated round header with a four-segment ring die around a center opening 
Gold-plated can with a blue window set in a white ceramic face 
Bonding tool feeding a fine wire into a windowed ceramic package
Start with a free review of your technical content
Get a one-page comparison of your technical content with two competitors, three recommended documents or tools, and a price for the first project.