OTF STUDIO:  THIN FILM SOFTWARE FOR ANY CHALLENGE

New features, updates, and bug fix are here.


The most recent version 25.33:

  •  Stress and thickness optimization/compensation targets.
  •  BoundTrap design feature.
  •  Import of measurements by Drag&Drop.
  •  Expressions in 2D and 3D plots.
  •  Iso-reflectivity curves on Admittance panel. 

Quarter-wave mirror: Estimation of reflectance at the central wavelength, width of high-reflection zones, and angular shift

QWM2

Fig. 1. Schematic representation of the reflectance of a quarter-wave mirror (Bragg mirror) with the central wavelength of $\lambda_0$.

High-reflection (HR) zones of quarter-wave mirrors are spectral ranges, where reflectance is high and is growing if the number of layer pairs if increasing. The HR zones around the mirror central wavelength $\lambda_0$ is called principal or the first HR zone. The second, third, etc., HR zones are centered around $\lambda_0/3$, $\lambda_0/5$, ... wavelengths. With the growing of order, the HR zones are getting narrower. 

Here you can estimate reflectance at central wavelength and width of HR zones of quarter-wave mirrors of different structures (s-polarization case). Please input parameters required for calculations.

Refractive indices of layer materials and substrate (min. values 1.0):

nH  = nL  = ns  =   Angle of incidence AOI (0-89.9): degrees

Central wavelength (100-25000 nm):   = nm   Number of layer pairs (min. 5):   =


 

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