Study of EIT resonances in an anti-relaxation coated Rb vapor cell

• Published in: Physics letters. A 2019-01, Vol.383 (1), p.91-96
• Main Authors: Bhattarai, Mangesh, Bharti, Vineet, Natarajan, Vasant, Sargsyan, Armen, Sarkisyan, David
• Format: Article
• Language: English
• Subjects: Anti-relaxation coating; Electromagnetically induced transparency; Rb D1 line
• ISSN: 0375-9601; 1873-2429
• DOI: 10.1016/j.physleta.2018.09.036

•The scheme can be used to produce both slow and fast light.•The experimental results use magnetic sublevels of a hyperfine transition in the D1 line of 87Rb.•A two-region theoretical model reproduces the experimental results quite well. We study the sign of resonances obtained in electromagnetically induced transparency (EIT). Resonances of both kinds—bright (corresponding to enhanced absorption) and dark (corresponding to reduced absorption)—are obtained when the frequency of a probe beam is scanned. The experimental results, presented earlier, use magnetic sublevels of a hyperfine transition in the D1 line of 87Rb along with a magnetic field of 27 G. The atoms are contained in a vapor cell at room temperature, and with anti-relaxation coating on the walls. A quantitative theoretical model, which reproduces the experimental results quite well, is presented for the first time. The model solves the density matrix of the sublevels involved, and uses two regions—one with both the light and magnetic field, and the second without light and just a magnetic field. This ability to have both bright and dark resonances promises applications in sub- and super-luminal propagation of light.