| 摘要 |
<p>The present invention is aimed at providing a photonic crystal laser capable of producing a radially-polarized halo-shaped laser beam having a smaller width than that of conventional beams. A photonic crystal laser 10 includes: an active layer 11; a ring-shaped photonic crystal 123 including a plate-shaped base body 121 on one side of the active layer 11, the base body 121 having a number of modified refractive index areas 122 of the same shape, the modified refractive index areas 122 having a refractive index different from that of the base body 121 and being periodically arranged in the circumferential direction of a ring, and each of the modified refractive index areas 122 being asymmetrically shaped with respect to an axis extending through the center of the modified refractive index area 122 in the radial direction of the ring; a first electrode 131 and a second electrode 132 facing each other across the active layer 11 and the ring-shaped photonic crystal 123; and a window provided in the second electrode 141, the window being capable of allowing passage of a laser light generated from the ring-shaped photonic crystal 123.</p> |
