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Pulse propagation through a slab with time-periodic dielectric function ε(t).
Zurita-Sánchez, Jorge R; Abundis-Patiño, J H; Halevi, P.
Afiliação
  • Zurita-Sánchez JR; Instituto Nacional de Astrofísica, Optica y Electrónica, Apdo. Postal 51 y 216, Puebla, Pue. 72000, Mexico.
Opt Express ; 20(5): 5586-600, 2012 Feb 27.
Article em En | MEDLINE | ID: mdl-22418365
We describe pulse propagation through a slab with periodic dielectric function ε(t), thus extending our previous investigation for monochromatic incidence [Phys. Rev. A 79, 053821 (2009)]. Based on the concepts of phase and group delays, we prove that, for an incident quasi-monochromatic pulse, the transmitted pulse can be expressed as a superposition of partial pulses that are exact replicas of the incident pulse and that exit the slab with a time delay. These partial pulses have harmonic carrier frequencies ω c - nΩ (n is an integer, ω c is the carrier frequency of the incident pulse, and Ω = 2π/T is the slab modulation frequency). We find numerically that these partial pulses can be fast (peak velocity vn > c or vn < 0) or slow (vn << c). Further, we investigate the peak velocity v p of the outcoming pulse for several cases. We find that this peak velocity v p and the partial peak velocities vn do not diverge--as occurs to the group velocity v g of the bulk dynamic-periodic medium when ω c = Ω/2. We expect that these results could be verified in the microwave regime [see Halevi et al., Proc. SPIE 8095, 80950I (2011)].
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Refratometria / Algoritmos / Modelos Teóricos / Nefelometria e Turbidimetria Idioma: En Revista: Opt Express Assunto da revista: OFTALMOLOGIA Ano de publicação: 2012 Tipo de documento: Article País de afiliação: México País de publicação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Refratometria / Algoritmos / Modelos Teóricos / Nefelometria e Turbidimetria Idioma: En Revista: Opt Express Assunto da revista: OFTALMOLOGIA Ano de publicação: 2012 Tipo de documento: Article País de afiliação: México País de publicação: Estados Unidos