Angle dependent incident in PhC

[maxclark153]

Hi,
I simulated a Photonic Crystal model where the transmission is depends on the incident angle... the result is : as the angle of incident beam increase, so do the bandwidth of the bandgap... can someone explain why?

thanks

 

[maxclark153]

no reply?

 

[charng]

for sharing your simulation results! The phenomenon you observed is known as angle-dependent transmission in Photonic Crystals (PhCs). PhCs are periodic structures that manipulate light by creating bandgaps, which are ranges of frequencies where light cannot propagate through the structure. These bandgaps are highly dependent on the angle of incidence of the incident light beam.

The reason for this is due to the periodicity of the PhC structure. As the angle of incidence increases, the incident light beam becomes more oblique to the crystal lattice, causing the light to interact with the lattice in a different way. This changes the effective refractive index of the PhC and shifts the position and width of the bandgap.

In other words, the angle of incidence acts as a tuning knob for the bandgap of the PhC. This phenomenon has been extensively studied and has many practical applications, such as in designing tunable optical filters and sensors.

I hope this helps to explain the results of your simulation. Keep up the good work in exploring the fascinating world of PhCs!