Open AccessHigh refractive index chalcogenide glass for photonic crystal applications
Author(s) -
Kimmo Päiväsaari,
V. K. Tikhomirov,
Jari Turunen
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.002336
Subject(s) - materials science , femtosecond , chalcogenide glass , optics , refractive index , chalcogenide , laser , optoelectronics , fluence , photonic crystal , irradiation , physics , nuclear physics
A high refractive index Te-enriched bulk chalcogenide glass Ge(20)As(20)Se(14)Te(46) (n approximately 3.3) has been patterned by ablation using four- and two-beam interference femto-second laser setups operating at 800 nm. The regular arrays of 0.8 mum diameter and more than 0.8 mum depth holes and/or grooves of typical size of 1x1 mm(2) have been written on the surface of the glass in a time-scale of 1 second with 50 femtosecond pulses. The high photosensitivity of this narrow-gap semiconductor glass to the femtosecond irradiation is ascribed to a free electron absorption typical of metals, which is caused by laser-induced heating of the glass.