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Nonlinear optical properties of mushroom-shaped CdSe/CdS coreshells.
Ma, S M,Seo, J T,Yu, W,Yang, Q,Tabibi, B,Temple, D,Namkung, M,Heo, J,Kim, W J,Jung, S S American Scientific Publishers 2009 Journal of Nanoscience and Nanotechnology Vol.9 No.2
<P>The third-order nonlinear optical susceptibilities of mushroom-shaped CdSe/CdS coreshells as a function of concentration have been investigated using polarization- and concentration-resolved degenerate four-wave mixing in a resonant region. The effective third-order nonlinear optical susceptibilities, /chi(3)xxxx/ and /chi(3)xyyx/ of CdSe/CdS coreshells were estimated to be approximately 1.86 x 10(-21)-1.03 x 10(-20) m2/V2, and approximately 0.45 x 10(-21)-6.15 x 10(-21) m2/V2, respectively, for various concentrations of approximately 0.64 x 10(-3)-4.95 x 10(-3) mol/m3. The second hyperpolarizabilities, /<gammah>xxxx/ and /<gammah>xyyx/, of CdSe/CdS coreshells were extracted to be approximately 2.37 x 10(-41) m5/V2 and approximately 1.29 x 10(-41) m5/V2, respectively.</P>
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>
Yang, Q,Battle, R,Zhang, C,Ma, S M,Seo, J T,Tabibi, B,Temple, D,Sun, S,Jung, S S,Namkung, M American Scientific Publishers 2009 Journal of Nanoscience and Nanotechnology Vol.9 No.2
<P>The third-order nonlinearity of a PPV-based nanostructured supramolecular organic semiconductor (DBAB), with an electron donor (D) connected to an electron acceptor (A) via nonconjugated and flexible bridge (B) units, was investigated in this work at both near-resonant (532 nm) and nonresonant (1064 nm) wavelength by using degenerate four-wave mixing. The second hyperpolarizabilities of D, A, and DBAB at 532 nm were found to be approximately 2.42 x 10(-43) m2/V2, 7.75 x 10(-44) m2/V2, and 1.80 x 10(-43) m2/V2 in copolarization geometry, and approximately 1.59 x 10(-43) m2/V2, 2.59 x 10(-44) m2/V2, and 1.18 x 10(-43) m2/V2 in orthogonal polarization geometry, respectively. The second hyperpolarizabilities of DBAB at 1064 nm were approximately 1.66 x 10(-46) m2/V2 and approximately 8.77 x 10(-47) m2/V2 for parallel and orthogonal polarization cases.</P>
A. K.M.M.H. Meaze,Guinyun Kim,Dongchul Son,Hengsik Kang,Hossain Ahmed,In Soo Ko,Jong Hwa Chang,Kun Joong Yoo,Moo-Hyun Cho,Tae-Ik Ro,Won Namkung,Won-Chung Chung,Young Seok Lee,Young-Ae Kim 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.2
W. measure. tota. neutro. cross-section. o. natura. hafniu. i. th. neutro. energ. regio. fro. 0.. e. t. 10. e. b. usin. th. neutro. time-of- igh. metho. a. th. Pohan. Neutro. Facility. whic. consist. o. a. electro. linac. . water-coole. T. targe. wit. . wate. moderator. an. a. 11-m-lon.time-of- igh. path. . 6Li-ZnS(Ag. scintillato. wit. . diamete. o. 12.. c. an. . thicknes. o. 1..c. wa. use. a. . neutro. detector. an. . natura. hafniu. meta. plate. . . . c. i. are. b. 0. m. i. thickness. wa. use. fo. th. neutro. transmissio. measurement. Th. backgroun. leve. wa. determine. b. usin. notch-lter. o. Co. In. an. C. sheets. I. orde. t. reduc. th. gamm. ray. fro. Bremsstrahlun. an. fro. neutro. capture. w. employe. . neutron-gamm. separatio. syste. base. o. thei. dieren. puls. shapes. Th. presen. measuremen. wa. compare. wit. th. previou. one. an. th. evaluate. dat. i. ENDF/B-VI. Th. resonanc. parameter. wer. extracte. fro. th. transmissio. dat. b. usin. th. compute. cod. SAMMY. whic. utilize. bot. Dopple. an. resolutio. broadenin. effect. an. Bayes. generalize. leas. square. technique.
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.
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
재태 서,A. Wang,A. Mott,C. Pompey,D. Temple,J. Anderson,J. H. Kim,J. L. Qu,M. Namkung,Q. Yang,Q. Wang,S. Creekmore,S. S. Jung,W. Yu,X. Peng 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
Nonlinear optical properties of cadmium telluride semiconductor nanocrystals were investigated for optical power self-limiting application. The semiconductor nanocrystals were synthesized through colloidal methods. The nonlinear refraction and the nonlinear figure of merit of CdTe nanocrystals in toluene ($\sim$8 $\times$ 10$^{-5}$ mol/L) were estimated to be $\sim$ -1 $\times$ 10$^{-13}$ m$^2$/W and $\sim$200, respectively. The optical power limiting through CdTe nanoscale materials was mainly by the nonlinear refraction because of the high nonlinear FOM.
조롱박동루와 연관된 반복적 갑상선 및 주변 연조직 감염의 방사선학적 소견: 1예 보고
김흥철,황임경,남궁숙,홍명선,장지연,이지연,정희록,Heung Cheol Kim,M.D.,Im Kyung Hwang,M.D.,Sook Namkung,M.D.,Myung Sun Hong,M.D.,Ji Yeon Jang,M.D.,Ji Yeon Lee,M.D. and Hee Rok Jeong,M.D. 대한갑상선-내분비외과학회 2008 The Koreran journal of Endocrine Surgery Vol.8 No.3
We report here on a case of a recurrent left anterior neck infection and focal left suppurative thyroiditis that were associated with a congenital pyriform sinus fistula (PSF) in an 18-year-old male. Acute suppurative thyroidits is a very rare clinical condition and it is usually caused by infection that's derived from infected perithyroidal tissue or a congenital internal fistula. The PSF can lead to recurrent episodes of neck inflammation and abscess, and it is the most common cause of acute suppurative thyroiditis in young man. In this current case, the CT scan showed an air-containing tract of a PSF from the left pyriform sinus to the left thyroid gland and the perithyroidal soft tissue. The CT scan also showed a neck inflammatory infiltration or abscess along the course of the sinus tract. The focal low density of the thyroid parenchyma was seen and this was suggestive of suppurative thyroiditis. Barium esophagography demonstrated the fistulous tract in the PSF. We performed laryngoscopy, and the internal opening of the pyriform sinus fistula was successfully cauterized with AgNO<SUB>3</SUB> and the post procedure course was fair. When an air-containing tract and a recurrent inflammatory infiltration or abscess are present at the left anterior neck with including the thyroid and perithyroidal soft tissue, a PSF should be strongly suspected. <B>(Ko</B><B></B><B>rean J Endocrine Surg 2008;8:206-209</B><B>)</B>