Square microresonator,
2D simulation of a configuration with the following specification: background refractive index nb = 1.0, refractive index of the guiding regions ng = 3.2, cavity extension W = 1.54 µm, waveguide width w = 0.2 µm, gap width g = 0.29 µm. All calculations are meant for TE polarization, i.e. Ey is the single nonvanishing component of the electrical field.

The parameters were adopted from C. Manolatou, M.J. Khan, S. Fan, P.R. Villeneuve, H.A. Haus, and J.D. Joannopoulos, Coupling of modes analysis of resonant channel add-drop filters, IEEE Journal of Quantum Electronics, 35(9):1322--1331, 1999.

 
Spectral response of the resonator element:
The device is excited in port A by the guided mode of the lower waveguide with the specified vacuum wavelength lambda. PB - PD and PA are the relative power transmissions to ports B, C, and D, and the relative power reflected into port A. Note that the curves related to PA, PC, and PD are almost superimposed. The links at the positions indicated by the the blue tick marks lead to illustrations of the time dependent electric field, and of the local electromagnetic energy density, respectively.

1.367 µm 1.41 µm 1.459 µm 1.481 µm 1.532 µm 1.555 µm 1.574 µm 1.617 µm 1.678 µm 1.691 µm

 
The pronounced resonance at 1.532 µm:
While the plots connected to the former spectrum had their colour schemes adjusted to the individual field / energy range, the colour levels of the images linked to this figure are comparable.

1.526 µm 1.528 µm 1.53 µm 1.531 µm 1.532 µm 1.533 µm 1.534 µm 1.536 µm 1.538 µm