TMM QE Calculator
Compute the quantum efficiency spectrum of a BSI CMOS pixel using the Transfer Matrix Method. Adjust silicon thickness, BARL layers, and angle of incidence to see real-time results.
TMM Quantum Efficiency Calculator
Configure a BSI pixel layer stack and see real-time R/T/A/QE spectra computed via the transfer matrix method.
How It Works
The TMM models each layer as a thin film with complex refractive index. Light propagation through the stack is computed via 2×2 transfer matrices, yielding reflectance (R), transmittance (T), and per-layer absorption (A). The QE equals the fraction of light absorbed in the silicon photodiode layer.
Key Parameters
- Silicon thickness controls NIR sensitivity — thicker Si absorbs more long-wavelength photons
- Angle of incidence simulates chief ray angle (CRA) effects from the camera lens
- Polarization — real scenes contain unpolarized light; s/p modes show the individual components
Physics Note
This is a 1D planar approximation — it does not account for microlens focusing, DTI scattering, or lateral crosstalk. For those effects, use the full RCWA/FDTD solvers.