학술논문
Large Optical Nonlinearity of Highly Porous Silica Nanoaerogels in the Nanosecond Time Domain
Document Type
Article
Author
Source
Journal of the Korean Physical Society, 48(6), pp.1395-1399 Jun, 2006
Subject
Language
ISSN
1976-8524
0374-4884
0374-4884
Abstract
The nonlinear optical properties of highly porous silica nanoaerogels with a 0.1 g/cm3 apparent density were investigated using a spatially Gaussian shaped, 8 ns pulsed laser operating at a wavelength of 532 nm with a repetition rate of 10 Hz. Closed Z-scan spectroscopy revealed the negative nonlinearity (or defocusing effect) of the silica nanoaerogels. The third-order nonlinear susceptibility of silica nanoaerogels was estimated to be 9.6 × 10.19 m2/V2 (6.9 × 10.11 esu) from degenerate four-wave mixing measurements. The nonlinear transmittance limiting threshold of silica nanoaerogels was 17 MW/cm2.F