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Chinese Journal of Spectroscopy Laboratory

Controlling the One-Dimensional Photonic Crystal Bandgap Structures Via Manipulation of Electromagnetically Induced Transparency Atomic Vapor

Xu Sen

Published Jan 1, 2013• 0 citations
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Abstract

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.

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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. 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 kind of photonic crystal structure with modulation of the refractive index is investigated both experimentally and theoretically for exploiting electromagnetically induced transparency (EIT). The combination of EIT with periodically modulated refractive index medium gives rise to high efficiency reflection as well as forbidden transmission in a three-level atomic system coupled by standing wave. We show an accurate theoretical simulation via transfer-matrix theory, automatically accounting for multilayer reflections, thus fully demonstrate the existence of photonic crystal structure in atomic vapor.
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 technique of electromagnetically induced transparency, three photonic bandgaps can be established and manipulated at any time due to the refraction modulated periodically by the one-dimensional optical lattice in a tripod atomic system which is trapped in a one-dimensional optical lattice with a Gaussian density distribution. Using the density-matrix equations to describe the interaction between laser and atoms and the transfer-matrix equation to describe the scattering of light waves in periodic media, we can obtain the steady reflection and transmission spectra. It can be found that the position and width as well as the reflectivity of the photonic band-gap could be tuned by changing the detunings and intensities of the coupling fields and the geometric Bragg detuning.
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.