Fabrication of Nano-meter-sized Periodic Structures by Holographic Exposure of Pulsed Laser Light and Their Novel Optical properties and Lasing

Matsui, Tatsunosuke

電気材料技術懇談会

photonic crystal

By means of one-shot holographic exposure of pulsed laser beams, permanent and transient nano-meter-sized periodic structures were fabricated, and studies on the application for various optical devices were curried out. Using nega-type photoresist SU-8 as a sample, one-and two-dimensional periodic structures with near vertical sidewalls and high aspect ratio were fabricated. Moreover, laser action utilizing transient grating was studied. The laser action was realized by a holographic excitation under a first-order diffraction condition, using a film of conducting polymer MDDO-PPV as an active medium. Lasing wavelength can be tuned by changing the angle between two excitation laser beams. A permanent periodic structure can also be written by intense exposure. An electro-tuning of lasing wavelength under holographic excitation was also realized utilizing a dye-doped nematic liquid crystal as an active medium. 30 nm shift of lasing wavelength could be achieved with an applied voltage of several volts.

Matsui, Tatsunosuke