Resources

1D Transfer matrix method calculator

A tool for calculating transmittance and reflectance spectra of multilayer structures, and the electric field distribution at selected resonances.

The default setting is for a terahertz 1D photonic crystal composed of alternating layers with refractive indices of 1 and 4.

Please contact fuyang.tay@columbia.edu if you find any errors.

Frequency scan

Please enter the frequency range.

Frequency unit Start frequency, THz Stop frequency, THz Frequency step, THz

Layer structure

Enter the refractive-index list and thickness list in the same layer order. Separate values using commas, spaces, or new lines. The two lists must have the same number of entries. Complex refractive indices are allowed.

Refractive index list, n Thickness unit Thickness list, um

After changing the layer structure or frequency scan, click Run TMM to recalculate the spectra.

Transmittance and reflectance spectra

Click T/R to toggle their visibility.

Peak selection

Use Peaks search freq min and Peaks search freq max to define the frequency range for detecting cavity peaks from the calculated transmittance spectrum. Select a detected peak to view the electric field profile at that frequency.

Peaks search freq min, THz Peaks search freq max, THz

Detected cavity peaks

Run TMM to detect peaks.

Electric-field profile

Run TMM to calculate the electric-field profile.

Colored regions indicate the layer positions. Layers with the same refractive index use the same color.