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Acta Physica Sinica

Controlling the photonic bandgap structures via manipulation of refractive index of electromagnetically induced transparency vapor

Fei Zhuang, Shen Jian-Qi, Jun Ye, (1)杭州师范学院理学院凝聚态物理研究所，杭州 310036; (2)浙江大学(紫金港校区)，浙江大学-瑞典皇家工学院光子学联合研究中心(东5教学楼)，杭州 310058

Published Jan 1, 2007• 7 citations
Publisher

Abstract

A new application of coherent manipulation of EIT (electromagnetically induced transparency) medium is suggested. A two-dimensional photonic cystal with a triangle lattice of elliptic air cylinders, which are filled with the EIT atomic vapor, in the KAs backgroud material is designed. By manipulating the refractive index of the EIT vapor via the external control field, one can obtain the controllable bandgap structure that is sensitive to the variations of external conditions (e.g. the intensity of the control field). It is shown that a large complete bandgap of about 0.0503ωe in the region of high normalized frequency could be achieved by choosing the specific parameters such as the spontaneous decay rate, dephasing rate, Rabi frequency of control light, atomic number density as well as elliptic geometric parameters.

DOI
10.7498/aps.56.541

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A new application of coherent manipulation of EIT (electromagnetically induced transparency) medium is suggested. A two-dimensional photonic cystal with a triangle lattice of elliptic air cylinders, which are filled with the EIT atomic vapor, in the KAs backgroud material is designed. By manipulating the refractive index of the EIT vapor via the external control field, one can obtain the controllable bandgap structure that is sensitive to the variations of external conditions (e.g. the intensity of the control field). It is shown that a large complete bandgap of about 0.0503ωe in the region of high normalized frequency could be achieved by choosing the specific parameters such as the spontaneous decay rate, dephasing rate, Rabi frequency of control light, atomic number density as well as elliptic geometric parameters.
A two-dimensional photonic cystal with a rctangular lattice of elliptic air cylinders,which are filled with the EIT atomic vapor in the GaAs backgroud material,is designed.By manipulating the refractive index of the EIT vapor via the external control field,one can obtain the controllable bandgap structure that is sensitive to the variations of external conditions(e.g.the intensity of the control field).It is shown that tunable bandgap in the high region of normalized frequency could be achieved by choosing the specific parameters such as the spontaneous activity rate,dephasing rate,Rabi frequency of controllable light,atomic number density as well as elliptic geometric parameters.
Using the Transfer matrix method to reserch the one-dimensional photonic crystal bandgap structure which is made of electromagnetically induced transparency atomic vapor.The results show that the photonic crystal bandgap can be manipulated by varying the refractive index of electromagnetically induced transparency atomic vapor.The EIT atomic vapor relative refractive index gradually increasing with the Rabi frequency.With the Rabi frequency gradually increasing,the band gap of the photonic crystal becomes more and more narrow,but the change is becoming slower.
A new application of coherent manipulation of EIT(electromagnetically induced transparency) medium is suggested,that is controlling the Brewster angle via manipulation of refractive index of electromagnetically induced transparency vapor.The EIT atomic vapor are filled on the background of two pieces glass whose refractive index is 1.5.By manipulating the refractive index of the EIT vapor via the external control field,one can obtain the controllable Brewster angle that is sensitive to the variations of external conditions(e.g.the intensity of the control field).It is shown that Controlling the Brewster angle can be achieved by choosing the specific parameters such as the Rabi frequency of control light.
A periodic layered medium, with unit cells consisting of a dielectric and an electromagnetically-induced transparency (EIT)-based atomic vapor, is designed for light propagation manipulation.Considering that a destructive quantum interference relevant to a two-photon resonance emerges in EIT-based atoms interacting with both control and probe fields, an EIT-based periodic layered medium exhibits a flexible frequency-sensitive optical response, where a very small variation in the probe frequency can lead to a drastic variation in reflectance and transmittance.The present EIT-based periodic layered structure can result in controllable optical processes that depend sensitively on the external control field.The tunable and sensitive optical response induced by the quantum interference of a multi-level atomic system can be applied in the fabrication of new photonic and quantum optical devices.This material will also open a good perspective for the application of such designs in several new fields, including photonic microcircuits or integrated optical circuits.
The optical response of an atomic vapor can be controlled by using tunable quantum interference induced by external control field. A periodic layered medium whose unit cells consist of dielectric (e.g., GaAs) and EIT (electromagnetically induced transparency) atomic vapor is suggested. It is demonstrated that such an EIT-based periodic layered medium shows more flexible optical response (sensitive to frequency) than a conventional photonic crystal does. The controllable band structure that depends on the external control field can be applicable to designs of new devices such as photonic switches and photonic logic gates, where one laser field can be controlled by the other one, and would have potential applications in the field of integrated optical circuits and other related areas, e.g., the all-optical technique.