Negatively refracting atomic vapour

• A new mechanism for realizing negative refractive index with a four-level atomic system is suggested. The explicit expressions for the electric permittivity and magnetic permeability at probe frequency are presented. It is shown that there is a frequency band in which the four-level photonic-resonant atomic vapour may exhibit simultaneously negative permittivity and permeability, and that such an atomic vapour may become a left-handed material ( negatively refracting medium). Compared with the previous schemes to realize negative refraction within the framework of classical electromagnetic theory, the most remarkable features of the present scenario are as follows: ( i) isotropic material with microscopic structure units at atomic-scale level, ( ii) negative refraction in visible and infrared frequency bands, ( iii) controllable manipulation by external fields and ( iv) based on quantum coherence in a multilevel atomic system.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Nyckelord

Electrical engineering, electronics and photonics

Elektroteknik, elektronik och fotonik

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)