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http://hdl.handle.net/2289/4016
Title: | Directional optical switch using interacting dark states |
Authors: | Narayanan, Andal Madathil, Preethi Thekkile Manjappa, Manukumara |
Issue Date: | Sep-2010 |
Publisher: | Optical Society of America |
Citation: | Journal of the Optical Society of America B, 2010, Vol. 27, p1778 |
Abstract: | We experimentally observe a non-linear absorption resonance in one of the two probe beams of a double Λ system which is interacting with three optical beams. This probe beam counterpropagates to the other two beams, both of which are co-propagating. The absorption resonance in this probe beam arises due to interaction between the dark states of the double Λ created by the co-propagating beams. The double Λ configuration of levels is in the D2 hyperfine manifold of 87Rb atoms, and the interaction is studied at room temperature. The non-linear absorption resonance is shown to be a three-photon process arising whenever the two co-propagating beams satisfy the two-photon Raman condition, necessary for electromagnetically induced transparency. Through a dressed state analysis, we show that the absorption feature is a result of interference between the absorption pathways to the excited states, from the ground states of the double Λ. The non-linear nature of the probe beam absorption enables it to perform like a directional optical switch. This absorption switch operates conditioned on non-absorption of a single photon of the same frequency due to a coherent process, in a beam traveling in the opposite direction. |
Description: | Restricted Access. |
URI: | http://hdl.handle.net/2289/4016 |
ISSN: | 1520-8540 (Online) 0740-3224 |
Alternative Location: | http://dx.doi.org/10.1364/JOSAB.27.001778 |
Copyright: | 2010 Optical Society of America |
Appears in Collections: | Research Papers (LAMP) |
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2010_JoptSAmB_27_1778.pdf Restricted Access | Restricted Access | 350.96 kB | Adobe PDF | View/Open Request a copy |
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