TY - GEN
T1 - Optical absorption and SHG in PMMA:DR1 thin films as function of poling time
AU - García-Macedo, Jorge A.
AU - Franco, Alfredo
AU - Valverde-Aguilar, Guadalupe
AU - Aguilar-Gutiérrez, Carlos
PY - 2007
Y1 - 2007
N2 - Amorphous, PMMA: DR1 : surfactant and PMMA:DR1 :TEOS thin films were prepared by dip-coating. All films were calcined at 70°C for 3 hours. For nanostructured thin films two ionic surfactants were used, Sodium Dodecyl Sulfate (SDS) and Cetyltrimethyl ammonium bromide (CTAB) to obtain two different nanostructures of the PMMA matrix: lamellar, and hexagonal, respectively. X-ray diffraction studies were performed to determine the long-order structure tailored in the films. The measurements of the optical absorption and the second harmonic generation (SHG) intensity were carried out at different orientation arrangements of the chromophores embedded in the films. The chromophore orientation distributions were obtained by means of the corona technique. These distributions depend on the corona poling time. We physically modeled the optical absorption and the second harmonic generation experimental results as function of the corona poling time, employing only one fitting parameter related to the matrix-chromophore interactions. The physical model and the experimental results were in an excellent agreement. The experimental results fitted by the model are shown in plots of order parameter against corona poling time and SHG intensity against corona poling time. The amorphous films provide a larger SHG intensity values than those obtained from the nanostructured films. Thin films with lamellar structure have a SHG intensity bigger than those from hexagonal and PMMA:TEOS thin films.
AB - Amorphous, PMMA: DR1 : surfactant and PMMA:DR1 :TEOS thin films were prepared by dip-coating. All films were calcined at 70°C for 3 hours. For nanostructured thin films two ionic surfactants were used, Sodium Dodecyl Sulfate (SDS) and Cetyltrimethyl ammonium bromide (CTAB) to obtain two different nanostructures of the PMMA matrix: lamellar, and hexagonal, respectively. X-ray diffraction studies were performed to determine the long-order structure tailored in the films. The measurements of the optical absorption and the second harmonic generation (SHG) intensity were carried out at different orientation arrangements of the chromophores embedded in the films. The chromophore orientation distributions were obtained by means of the corona technique. These distributions depend on the corona poling time. We physically modeled the optical absorption and the second harmonic generation experimental results as function of the corona poling time, employing only one fitting parameter related to the matrix-chromophore interactions. The physical model and the experimental results were in an excellent agreement. The experimental results fitted by the model are shown in plots of order parameter against corona poling time and SHG intensity against corona poling time. The amorphous films provide a larger SHG intensity values than those obtained from the nanostructured films. Thin films with lamellar structure have a SHG intensity bigger than those from hexagonal and PMMA:TEOS thin films.
KW - Chromophores
KW - Films
KW - Optical absorption
KW - Poling
KW - Second harmonic generation
UR - http://www.scopus.com/inward/record.url?scp=42149193903&partnerID=8YFLogxK
U2 - 10.1117/12.730866
DO - 10.1117/12.730866
M3 - Contribución a la conferencia
AN - SCOPUS:42149193903
SN - 9780819468017
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Linear and Nonlinear Optics of Organic Materials VII
PB - SPIE
T2 - Linear and Nonlinear Optics of Organic Materials VII
Y2 - 28 August 2007 through 30 August 2007
ER -