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Electric and magnetic dipole allowed transitions of atoms for three-dimensionally isotropic left handedness in a mixed atomic vapor
KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
2014 (Engelska)Ingår i: Progress of Theoretical and Experimental Physics, ISSN 2050-3911, nr 3, s. 033A01-Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Since previous negative-index atomic media based on quantum optical approaches are highly lossy, a proposal for realizing a three-dimensionally isotropic left-handed atomic vapor medium is suggested based on a mechanism of incoherent gain assisted atomic transitions. Two three-level atomic systems are utilized for producing simultaneously negative permittivity and negative permeability, respectively, in the same frequency band. We suggest that fine and hyperfine level transitions of atoms (e.g., a hyperfine level transition in a hydrogen atomic system and a fine level transition in an alkali-metal atomic system) would be applicable to realization of such a negatively refracting atomic vapor. The attractive features of the present scenario include: i) three-dimensionally isotropic negative indices; ii) incoherent gain wave amplification in the negative-index atomic vapor; iii) tunable negative indices depending upon external fields. Such a left-handed quantum optical medium can serve as a supporting substrate for lossy negative-index materials for loss compensation. It can also be used in designing new quantum optical and photonic devices (e.g., a subwavelength focusing system and a negative-index superlens for perfect imaging) because of its attractive properties of three-dimensional isotropy and high-gain wave amplification.

Ort, förlag, år, upplaga, sidor
2014. nr 3, s. 033A01-
Nyckelord [en]
Negative Index, Gain, Metamaterial, Spectroscopy, Refraction, Gas
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Identifikatorer
URN: urn:nbn:se:kth:diva-146578DOI: 10.1093/ptep/ptu018ISI: 000335898300003Scopus ID: 2-s2.0-84898474108OAI: oai:DiVA.org:kth-146578DiVA, id: diva2:724634
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QC 20140613

Tillgänglig från: 2014-06-13 Skapad: 2014-06-12 Senast uppdaterad: 2014-06-13Bibliografiskt granskad

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Shen, Jian Qi
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Zhejiang-KTH Joint Research Center of Photonics, JORCEP
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