Abstract
Self-collimation effects in photonic crystals are generally investigated by employing flat equifrequency contours. Here we report, based on a partially flat equifrequency contour inducing two different group velocity vectors, the simultaneous excitation of dual self-collimated beams and the selective excitation of either of them by varying the incident angle or the width of an input Gaussian beam. With combination of the finite-difference time-domain simulation and the Fourier analysis as well as the wave vector diagram, we analyze the refractive behaviors of these self-collimated Bloch waves.
Original language | English |
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Article number | 251120 |
Journal | Applied Physics Letters |
Volume | 89 |
Issue number | 25 |
DOIs | |
State | Published - 2006 |