TY - JOUR
T1 - On the physical contributions to the third-order nonlinear optical response in plasmonic nanocomposites
AU - Fernández-Hernández, Roberto Carlos
AU - Gleason-Villagran, Roberto
AU - Torres-Torres, Carlos
AU - Rodríguez-Fernández, Luis
AU - Crespo-Sosa, Alejandro
AU - Cheang-Wong, Juan Carlos
AU - López-Suárez, Alejandra
AU - Rangel-Rojo, Raúl
AU - Oliver, Alicia
AU - Reyes-Esqueda, Jorge Alejandro
PY - 2012/12
Y1 - 2012/12
N2 - Au and Ag isotropic and anisotropic nanocomposites were prepared using the ion implantation technique. Their optical properties were studied at several wavelengths in the optical range 300-800 nm, across their plasmon resonances. The linear regime was characterized by measuring the absorption spectrum and the third-order nonlinear regime by means of the Z-scan technique using a tunable picosecond pulsed laser system (26 ps). Open-aperture Z-scan traces show a superposition of different optical nonlinear absorption (NLA) processes in the whole range studied. We associate these phenomena with the excitation of inter- and intra-band electronic transitions, which contribute with a positive sign to NLA, and to the formation of hot-electrons, which contribute with opposite sign to NLA. Closed-aperture traces for measuring nonlinear refraction (NLR) show different signs for Au and Ag samples, and a change of sign in Au is found when purely inter-band transitions are excited. In this work, for the appropriate wavelength, it is worth remarking on the free-electron response to the exciting light and its strong contribution to the nonlinear optical properties for low (intra-band) and high (hot-electrons) irradiances.
AB - Au and Ag isotropic and anisotropic nanocomposites were prepared using the ion implantation technique. Their optical properties were studied at several wavelengths in the optical range 300-800 nm, across their plasmon resonances. The linear regime was characterized by measuring the absorption spectrum and the third-order nonlinear regime by means of the Z-scan technique using a tunable picosecond pulsed laser system (26 ps). Open-aperture Z-scan traces show a superposition of different optical nonlinear absorption (NLA) processes in the whole range studied. We associate these phenomena with the excitation of inter- and intra-band electronic transitions, which contribute with a positive sign to NLA, and to the formation of hot-electrons, which contribute with opposite sign to NLA. Closed-aperture traces for measuring nonlinear refraction (NLR) show different signs for Au and Ag samples, and a change of sign in Au is found when purely inter-band transitions are excited. In this work, for the appropriate wavelength, it is worth remarking on the free-electron response to the exciting light and its strong contribution to the nonlinear optical properties for low (intra-band) and high (hot-electrons) irradiances.
KW - nanocomposites
KW - nonlinear optical spectroscopy
KW - nonlinear optics
KW - plasmonics
UR - http://www.scopus.com/inward/record.url?scp=84870337725&partnerID=8YFLogxK
U2 - 10.1088/2040-8978/14/12/125203
DO - 10.1088/2040-8978/14/12/125203
M3 - Artículo
SN - 2040-8978
VL - 14
JO - Journal of Optics (United Kingdom)
JF - Journal of Optics (United Kingdom)
IS - 12
M1 - 125203
ER -