Holographic encoding of fine-pitched micrograting structures in amorphous SiO[sub 2] thin films on silicon by a single femtosecond laser pulse

Kawamura, Ken-ichi; Sarukura, Nobuhiko; Hirano, Masahiro; Hosono, Hideo
February 2001
Applied Physics Letters;2/19/2001, Vol. 78 Issue 8, p1038
Academic Journal
Fine-pitched micrograting structures were holographically encoded in amorphous (a-) SiO[sub 2] thin films on silicon wafers by colliding a pair of focused pulses split from a single, mode-locked Ti: sapphire, femtosecond laser. A method enhancing the third-harmonic generation resulting from the nonlinearity of air adjusted the optical paths of the two pulses. Surface-relief-type gratings were formed on SiO[sub 2] glasses due to laser ablation when the laser power exceeded more than 0.3 mJ/pulse, while shallow grating structures were imprinted on a-SiO[sub 2] thin films by volume compaction (∼3%) when the irradiation power was reduced to ∼50 μJ/pulse. The postirradiation deepening of the valley of the grating structure was possible with chemical etching. The minimal spacing of 430 nm was encoded using the 800 nm laser. © 2001 American Institute of Physics.


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