Work

Light-dressed states under intense optical near fields

Year: 2018

Type: article

Abstract: We studied the excitation dynamics of a finite quantum system with an intense optical near field (ONF) from a perspective of light-dressed states. A simple model consisting of a single electron and a nanosized short dipole source were employed. By calculating the time-dependent wave function subjected to the ONF, we demonstrated that the optical responses involved not only the first- and third-order but also the second- and fourth-order harmonic generations that were not obtained from conventional spatially homogeneous laser fields. In order to elucidate the origins of the exotic even-order harmonic generations, the dressed states altered by the ONF were explored. The result showed that the spatial distribution of the dressed states were significantly influenced by the ONF, making forbidden optical transitions allowed by parity breaking. This was caused by the spatial inhomogeneousness of the ONF, specifically its asymmetry, that was inherited to the dressed states.

Source: Physical Review A

DOI: 10.1103/physreva.98.053440

Authors: Takashi Takeuchi, Tokuei Sako, Katsuyuki Nobusada

Institutions: University of Tsukuba, Center for Computational Sciences, University of Tsukuba, Nihon University, Institute for Molecular Science

Language: English

Topic: Laser-Matter Interactions and Applications

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: University of Tsukuba, Japan Society for the Promotion of Science, Japan Science and Technology Agency, Core Research for Evolutional Science and Technology

Awards: G2583623727, Development of near-field Raman microscope utilizing fluctuation, Cooperative light-matter dynamics in the theoretical framework with radiation reaction