TY - JOUR
T1 - Ultrafast optical phase modulation with metallic nanoparticles in ion-implanted bilayer silica
AU - Torres-Torres, C.
AU - Tamayo-Rivera, L.
AU - Rangel-Rojo, R.
AU - Torres-Martínez, R.
AU - Silva-Pereyra, H. G.
AU - Reyes-Esqueda, J. A.
AU - Rodríguez-Fernández, L.
AU - Crespo-Sosa, A.
AU - Cheang-Wong, J. C.
AU - Oliver, A.
PY - 2011/9/2
Y1 - 2011/9/2
N2 - The nonlinear optical response of metallic-nanoparticle-containing composites was studied with picosecond and femtosecond pulses. Two different types of nanocomposites were prepared by an ion-implantation process, one containing Au nanoparticles (NPs) and the other Ag NPs. In order to measure the optical nonlinearities, we used a picosecond self-diffraction experiment and the femtosecond time-resolved optical Kerr gate technique. In both cases, electronic polarization and saturated absorption were identified as the physical mechanisms responsible for the picosecond third-order nonlinear response for a near-resonant 532nm excitation. In contrast, a purely electronic nonlinearity was detected at 830nm with non-resonant 80fs pulses. Regarding the nonlinear optical refractive behavior, the Au nanocomposite presented a self-defocusing effect, while the Ag one presented the opposite, that is, a self-focusing response. But, when evaluating the simultaneous contributions when the samples are tested as a multilayer sample (silica-Au NPs-silica-Ag NPs-silica), we were able to obtain optical phase modulation of ultra-short laser pulses, as a result of a significant optical Kerr effect present in these nanocomposites. This allowed us to implement an ultrafast all-optical phase modulator device by using a combination of two different metallic ion-implanted silica samples. This control of the optical phase is a consequence of the separate excitation of the nonlinear refracting phenomena exhibited by the separate Au and Ag nanocomposites.
AB - The nonlinear optical response of metallic-nanoparticle-containing composites was studied with picosecond and femtosecond pulses. Two different types of nanocomposites were prepared by an ion-implantation process, one containing Au nanoparticles (NPs) and the other Ag NPs. In order to measure the optical nonlinearities, we used a picosecond self-diffraction experiment and the femtosecond time-resolved optical Kerr gate technique. In both cases, electronic polarization and saturated absorption were identified as the physical mechanisms responsible for the picosecond third-order nonlinear response for a near-resonant 532nm excitation. In contrast, a purely electronic nonlinearity was detected at 830nm with non-resonant 80fs pulses. Regarding the nonlinear optical refractive behavior, the Au nanocomposite presented a self-defocusing effect, while the Ag one presented the opposite, that is, a self-focusing response. But, when evaluating the simultaneous contributions when the samples are tested as a multilayer sample (silica-Au NPs-silica-Ag NPs-silica), we were able to obtain optical phase modulation of ultra-short laser pulses, as a result of a significant optical Kerr effect present in these nanocomposites. This allowed us to implement an ultrafast all-optical phase modulator device by using a combination of two different metallic ion-implanted silica samples. This control of the optical phase is a consequence of the separate excitation of the nonlinear refracting phenomena exhibited by the separate Au and Ag nanocomposites.
UR - http://www.scopus.com/inward/record.url?scp=84859496038&partnerID=8YFLogxK
U2 - 10.1088/0957-4484/22/35/355710
DO - 10.1088/0957-4484/22/35/355710
M3 - Artículo
C2 - 21828891
SN - 0957-4484
VL - 22
JO - Nanotechnology
JF - Nanotechnology
IS - 35
M1 - 355710
ER -