title: Optoelectronic modulation by multi-wall carbon nanotubes.
abstract: We report the observation of photoconduction and a strong nonlinear optical absorptive response exhibited by multi-wall carbon nanotubes. An aerosol pyrolysis method was employed for the preparation of the samples. Measurements of the optical transmittance with 7 ns pulses at 1064 nm wavelength allowed us to identify a two-photon absorption effect as the main mechanism of third-order nonlinearity. Photoconductive experiments at 445 nm wavelength seem to confirm the possibility for generating non-resonant multi-photonic absorption processes in the multi-wall carbon nanotubes. By the optical control of the conductivity in the nanotubes, we implement an optoelectronic amplitude modulator device with potential applications for sharp selective functionalities.
authors.affiliation: Sección de Estudios de Posgrado e Investigación, ESIME-Z, Instituto Politécnico Nacional, México, D F, 07738, Mexico. crstorres@yahoo.com.mx
authors.forename: C
authors.initials: C
authors.lastname: Torres-Torres
authors.forename: N
authors.initials: N
authors.lastname: Peréa-López
authors.forename: H
authors.initials: H
authors.lastname: Martínez-Gutiérrez
authors.forename: M
authors.initials: M
authors.lastname: Trejo-Valdez
authors.forename: J
authors.initials: J
authors.lastname: Ortíz-López
authors.forename: M
authors.initials: M
authors.lastname: Terrones
mesh_terms: D004566:Electrodes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008422:Materials Testing; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000528:radiation effects*; D010783:Photometry / Q000295:instrumentation* / Q000379:methods; D012031:Refractometry / Q000379:methods*; D013499:Surface Properties
chemical_list: D037742:Nanotubes, Carbon