[15a-F202-1~13] 3.12 Nanoscale optical science and near-field optics

[15a-F202-12] Theory of Non-resonant Effect in Near-filed Optics I

〇Itsuki Banno¹ (1.Univ. of Yamanashi)

Keywords:Near-field Optics, Non-resonant Effect, Nonlinear Optical Effect

In a near-field optical system, a nanostructure irradiates to the neighboring material the longitudinal and transverse electric fields, which are of distinct natures. The longitudinal incidence field should be the cause of specific phenomena in near-field optical system, because it does not exist in conventional optical system. In the Hamiltonian, the longitudinal and transverse fields are represented in terms of the scalar and vector potentials (under the Coulomb gauge), respectively, and the dependences to the two fields are different. Therefore, the longitudinal and transverse fields irradiating the material cause distinct responses, which appear only under the non-resonant condition. This presentation explores what linear and nonlinear effects are emphasized in the non-resonant near-field optical system, through our response theory adequate for the many-electron system in near-field optics.