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Highly Porous Silica Nanoaerogels for Ultrafast Nonlinear Optical Applications
Seo, Jae Tae,Ma, S.M.,Lee, K.,Brown, H.,Jackson, A.,Skyles, T.,Cubbage, N.M.,Tabibi, B.,Yoo, K.P.,Kim, Suk Young,Jung, S.S.,Namkung, M. Trans Tech Publications, Ltd. 2005 Key Engineering Materials Vol.287 No.-
<P>Highly porous silica nanoaerogels with low apparent density of ~0.1 g/cm3 and ~0.07 g/cm3 were synthesized through two-step sol-gel processing and low temperature supercritical fluid drying. The nonlinear refraction (γ) of silica nanoaerogels was estimated to be ~ -3.4 x 10-16 m2/W for ~0.1 g/cm3 and ~0.07 g/cm3 apparent densities with a signal-beam femtosecond z-scan spectroscopy. The third-order nonlinear refraction coefficient of nanostructure silica nanoaerogels was almost four orders larger than that of bulk silica materials. The large nonlinearrefraction with high nonlinear figure of merit (γ/βλ, β~2×10-10 m/W for 0.07 g/cm3 apparent density, β~6×10-10 m/W for 0.1 g/cm3 apparent density, λ~0.775 µm) is an ideal optical property for nonlinear applications of homeland security, battlefield enhancement, and industrial uses.</P>
Light-Induced Dispersion in Noninstantaneous Response Nonlinear Optical Materials
Qiguang Yang,JaeTae Seo,A. Jackson,B. Tabibi,H. Wang,M. Namkung,S. M. Ma,S. S. Jung,T. Skyles 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6
The light-induced dispersion in noninstantaneous response third-order nonlinear optical materials has been investigated in this work. We find, even far away from resonance, both normal and abnormal dispersions can be generated in third-order nonlinear optical materials, that possess large third-order nonlinearity and finite response time. The large third order nonlinearity and the finite response time are due to the highly dispersive coupling among the pump and the probe beams. This phenomenon may be used to control the group velocity of a light pulse.
Large Optical Nonlinearity of Highly Porous Silica Nanoaerogels in the Nanosecond Time Domain
JaeTae Seo,A. Jackson,B. Tabibi,H. Brown,K. Lee,K. P. Yoo,L. Creekmore,M. Namkung,Q. Yang,R. Battle,S. M. Ma,S. S. Jung,S. Y. Kim,T. Skyles 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6
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
Seongmin Ma,JaeTae Seo,A. Jackson,B. Tabibi,H. Brown,K. Lee,L. Creekmore,M. Namkung,Q. Yang,R. Battle,S. S. Jung,T. Skyles,W. Yu 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6
Single beam femtosecond Z-scan spectroscopy at 775 nm revealed that the effective third-order nonlinear susceptibility and hyperpolarizability of CdSe colloidal nanocrystals near the Bohr radius were 0.7 . 1.0 × 10.22 m2/V2 and 0.18 . 2.0 × 10.44 m5/V2, respectively. The non-resonant nonlinearity increase for CdSe colloidal quantum dots with bigger than average diameters is attributed to their absorption cross-section being larger and their bandgap energy being narrower than those of the quantum dots with smaller sizes.