Noise and bandwidth
Johnson, generation-recombination, 1/f, bandwidth, and instrumentation contributions.
Technical scopeIndependent infrared detector review
Find what is limiting your infrared detector.
Brooks Photonics analyzes electrical, spectral, noise, and frequency-response measurements to identify likely performance limits, measurement artifacts, and the most useful next step.
Typical response within one business day.
- Focused question
- Start with the measurement in front of you
- Physics-based
- Interpretation tied to device behavior and test conditions
- Independent
- Conclusions tied to measured data
Physics-based interpretationIndependent technical reviewMeasurements chosen to resolve uncertainty
Start with the measurement
Bring the result and the question.
Describe the measurement, operating conditions, and the result you want to understand. Brooks Photonics can identify the likely analysis path and the most informative next step.
- Noise PSD, I-V curve, spectral response, or frequency-response measurement
- Detector type, temperature, bias, and key test conditions
- The result, discrepancy, or decision you want to understand
Core capabilities
Measurements are considered together
A detector can appear limited by the material, the device geometry, the operating point, or the test system. The full dataset is used to distinguish among them.
Bias dependence
Operating regimes, gain behavior, saturation, heating, contacts, and current spreading.
Technical scopeSpectral response
Cutoff, composition, thickness, response shape, and measurement artifacts.
Technical scopeReview method
Start with the data already available.
The review checks the measurements, the test conditions, and the physical explanations before recommending additional work.
See the complete review process- Review the test conditions
Device geometry, temperature, bias, bandwidth, calibration, and instrumentation are established first.
- Compare competing explanations
Each proposed mechanism is checked against the observed scaling and known physical limits.
- Specify the resolving measurement
The next test is selected for its ability to distinguish the remaining explanations.
Technical notes
Methods behind the review.
Practical references show how detector measurements are interpreted and where common measurement errors enter.
Browse technical articles- HgCdTe noise spectra
Separate 1/f, generation-recombination, Johnson, and measurement-chain contributions.
Read the noise-spectrum guide - Equivalent noise bandwidth
Convert filtered RMS lock-in measurements into noise amplitude spectral density correctly.
Read the ENBW guide
Detector analysis