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Photodetector Applications

Start with your measurement.

Explore silicon and InGaAs detection for monitoring, biomedical sensing and material sensing. Connect your application requirements to the existing Marktech detector portfolio.

Silicon and InGaAs. Two routes to your design.

Compare the two core families, then review individual devices. Packaging, active area and electrical performance are model-dependent.

Silicon photodetectors

UV, visible and near-infrared sensing
Si
Conceptual Silicon detector illustration, not a product photograph or package drawingOPTICAL INPUTSILICON · DETECTOR CONCEPT

Conceptual illustration · not a product photograph

Explore silicon photodiodes for light monitoring, optical measurement, position sensing and industrial detection. Select the spectral response and package for your optical system.

Guide families
Series 8 · general purposeSeries 4 · UV–blue / greenSeries 11 · broad / red–NIR
Design paths
Light & laser monitoringPosition sensingOptical instruments

InGaAs PIN photodiodes

1.7 µm and extended 2.6 µm classes
InGaAs
Conceptual InGaAs detector illustration, not a product photograph or package drawingOPTICAL INPUTINGAAS · DETECTOR CONCEPT

Conceptual illustration · not a product photograph

Explore InGaAs/InP detectors for infrared monitoring, analytical instrumentation and SWIR optical sensing. Choose the wavelength class, geometry and package around your measurement.

Guide families
1.7 µm class2.6 µm extended classMulti-element options
Design paths
Laser & optical monitoringMoisture & compositionQuad & multi-element

The supplied InGaAs guide describes principally 600–1750 nm for its 1.7 µm class and 800–2600 nm for its 2.6 µm class, with model-dependent limits. A cutoff class does not imply constant responsivity or suitability at every wavelength.

Explore large-area
2.6 µm-class InGaAs PIN photodiodes.

Explore Optrans 1.5 mm and 3.0 mm active-area options for optical systems with a larger light spot or greater alignment tolerance needs. A 5.0 mm active-area device is in development; share your requirements to discuss its potential fit.

Select the detector around your actual measurement wavelengths and optical footprint, then balance light collection against dark current, capacitance and bandwidth. The 2.6 µm designation is a cutoff class, not a guarantee of uniform responsivity or high sensitivity at the cutoff.

Active-area size5.0 mm
In development

Development discussion only.
Not presented as orderable.

Size labels identify product interests, not package dimensions or a confirmed geometry. Confirm the drawing, specifications and commercial status with engineering.

What do you want to measure?

Begin with the measurement task, then match the detector to the actual wavelength, signal and operating conditions.

AI-generated concept of a blue-lit optical laboratory for light and laser monitoring
Silicon / InGaAs · wavelength-dependent

Light & Laser Monitoring

Monitor light output, optical power or beam position in an instrument or control system. Match detector response, active area and speed to your source and optical layout.

AI-generated non-invasive sensing concept showing an optical probe above a forearm; illustrative light and signal graphics, not a validated clinical system
Non-invasive sensing · application concepts

Non-Invasive Biomedical Sensing

Explore photodiode solutions for non-invasive optical sensing concepts targeting glucose, hemoglobin and tissue oxygenation. Photodiodes detect light returning from or transmitted through tissue; estimation of blood-related parameters depends on selected wavelengths, system design, calibration and clinical validation.

Glucose-related sensingHemoglobin-related sensingOxygenation monitoring

Application concepts, not validated diagnostic claims. Detector material and configuration must match each measurement method; a single PD is not assumed to support all three.

AI-generated concept of optical and analytical laboratory instrumentation with illustrative optical effects
Silicon / InGaAs · analytical wavelengths

Optical & Analytical Instruments

Build around the wavelength range and signal levels of your optical measurement or analytical method. Review noise, linearity, bandwidth and detector geometry as part of the instrument design.

AI-generated concept of optical moisture and material sensing, not an actual product or validated measurement
InGaAs · wavelength-selected sensing

Moisture & Material Sensing

Explore near-infrared measurements using material-absorption and reference wavelengths. Detector selection, illumination, calibration and optical geometry together determine system performance.

AI-generated concept of an optical gas cell between a light source and detector; the light path is illustrative, not a validated gas-analysis system
InGaAs · selected absorption wavelengths

Gas Sensing

Explore InGaAs photodiodes for optical gas-sensing systems that measure absorption at selected near-infrared wavelengths. Match the light source, absorption band and detector response to the target gas, then evaluate the complete optical path and readout.

AI-generated environmental-instrumentation concept beside a river, with optical sample equipment and monitoring station; not an actual product or validated system
Silicon / InGaAs · wavelength-dependent

Environmental Monitoring

Explore silicon and InGaAs detectors for environmental instruments measuring light, moisture-related changes and selected optical signatures in gases or materials. Detector choice depends on the measurement wavelength, collection optics and operating conditions, with calibration and application-specific validation required.

AI-generated system-level security instrumentation concept at an industrial facility; illustrative optical paths, not a claim that one photodiode forms an image
Application-specific optical systems

Defence, Security & Surveillance

Explore photodiodes for optical alignment, beam monitoring and sensing channels within defence and security systems. Surveillance concepts require the appropriate detector architecture and system-level evaluation; a single-element photodiode is not a camera or an image-recognition system.

AI-generated application concepts. Optical effects and scenes are illustrative, not actual products, validated systems or performance claims.

Illustrations show potential optical-system contexts, not validated customer installations or completed products. Biomedical sensing requires wavelength-specific detector selection, system calibration, clinical validation and applicable regulatory review; the page does not establish diagnostic performance.

Explore emerging possibilities.

Keep early-stage research opportunities separate from the primary application paths.

AI-generated agriculture and field-research concept; system architecture and feasibility require evaluation

AI-generated research concept; optical effects are illustrative and do not establish system performance.

Research concept · feasibility requires evaluation

Agriculture & Field Research

Explore moisture and optical monitoring research in field environments. Imaging, airborne operation and space use require suitable system architecture and separate qualification.

A single photodiode is not a camera. This illustration does not establish airborne or space qualification, soil-nutrient identification, or detection through soil or water.

Build a brief
around your design.

Choose a detector, multi-wavelength light source, or combined emitter–detector concept. Capture the requirements for engineering review, without implying an automatic product match.

  • Detector geometry is your requested active area. Specify the photosensitive diameter or width × height, not the package dimensions. Requested sizes are subject to feasibility review.
  • PIN PD and APD are different choices. APDs use internal multiplication and require appropriate bias and readout design. Published APD routes below refer to silicon devices.
  • Monitoring and measurement are different roles. A source-monitor PD observes emitter output. A measurement PD receives light from the sample or target.
  • Combined configurations need a system plan. A broadband PD cannot independently resolve simultaneous LED channels without a suitable separation or measurement architecture.
Conceptual signal paths
LED → source-monitor PD → feedback/readout
LED → sample → measurement PD → analysis

Monitoring alone does not establish closed-loop stabilization. Diagram paths are conceptual, not a guaranteed package configuration.

For design engineers

Review the product data.

Use the official product pages for current model specifications, drawings and commercial availability.

An application-page example

Go deeper on moisture sensing.

See the extended InGaAs moisture concept, including the optical-path explanation and an evaluation brief you can send to our engineering team.

See moisture. Design with confidence.

Based on the Silicon Photodetector Product and Selection Guide 2026 Rev2, InGaAs PIN Product List, SWIR InGaAs PD Presentation July 2026, and current official product-category links. No certification, end-system performance, pricing or delivery commitment is implied.