| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1542991 | Photonics and Nanostructures - Fundamentals and Applications | 2013 | 7 Pages |
We investigate dispersive properties of two dimensional photonic crystal (PC) called star-shaped PC (STAR-PC) in order to succeed super-collimation over a broad bandwidth. Both time- and frequency-domain numerical methods are conducted. Due to introduced low-symmetry in the primitive cell, flat contours are observed at the fifth band for transverse magnetic mode. The proposed structure supports a super-collimation effect over a broad wavelength range between 1443 nm and 1701 nm with a bandwidth of Δω = 16.42%. The intrinsic characteristic of STAR-PC provides in-plane beam propagation with a limited diffraction length of 120a, where a is the lattice constant. By means of STAR-PC, one may realize super-collimation based single-mode optical devices with a low insertion loss, reduced dispersion and wide bandwidth.
► Dispersive properties of two dimensional PC called star-shaped PC (STAR-PC) are investigated to succeed super-collimation over broad bandwidth. ► Applied method is based on engineering of the dispersion curves of low symmetric PC, which does not require any perturbation or nonlinearities. ► Due to introduced low-symmetry in the primitive cell, flat contours are observed at the fifth band for transverse magnetic mode. ► The proposed structure supports a super-collimation effect over a broad wavelength range between 1443 nm and 1701 nm with a bandwidth of Δω = 16.42%. ► By means of STAR-PC, one may realize super-collimation based optical devices with a low insertion loss, reduced dispersion and wide bandwidth.
