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Dephasing-Induced Control of Interference Nature in Three-Level Electromagnetically Induced Tansparency Systems.

Sun Y, Yang Y, Chen H, Zhu S - Sci Rep (2015)

Bottom Line: The nature of the interference, constructive, no interference or destructive, can be controlled by adjusting the dephasing rates.This new phenomenon is experimentally observed in meta-atoms.The physics behind the dephasing-induced control of interference nature is the competing between stimulated emission and spontaneous emission.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Advanced Micro-structure Materials (MOE) and School of Physics Sciences and Engineering, Tongji University, Shanghai 200092, China.

ABSTRACT
The influence of the dephasing on interference is investigated theoretically and experimentally in three-level electromagnetically induced transparency systems. The nature of the interference, constructive, no interference or destructive, can be controlled by adjusting the dephasing rates. This new phenomenon is experimentally observed in meta-atoms. The physics behind the dephasing-induced control of interference nature is the competing between stimulated emission and spontaneous emission. The random phase fluctuation due to the dephasing will result in the correlation and anti-correlation between the two dressed states, which will enhance and reduce the stimulated emission, respectively.

No MeSH data available.


Related in: MedlinePlus

Experimental setup to simulate the dephasing-induced control of interference in atomic EIT system.Transmission and reflection coefficients are measured with the microwave network analyzer. The EIT meta-atom consists of a “bright” resonator, a “dark” resonator, the pair of split rings. The near-field coupling strength between the two resonators is determined by the separation , and the dephasing rates of the two resonators, , can be adjusted by two resistors , respectively. Geometric parameters can be found in the Main Text.
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f4: Experimental setup to simulate the dephasing-induced control of interference in atomic EIT system.Transmission and reflection coefficients are measured with the microwave network analyzer. The EIT meta-atom consists of a “bright” resonator, a “dark” resonator, the pair of split rings. The near-field coupling strength between the two resonators is determined by the separation , and the dephasing rates of the two resonators, , can be adjusted by two resistors , respectively. Geometric parameters can be found in the Main Text.

Mentions: Our experiments are conducted by using meta-atom in microwave range. The experimental setup is shown in Fig. 4. The meta-atom is composed of two coupled resonators. The bright resonator () is a copper branch with the length of , and it is connected with the main-strip by the resistor , as indicted in the middle of Fig. 4. The dark resonator () is composed of two metal split rings with the dimensions of , which are located at the two sides of the first resonator. It has been demonstrated that the response of this configuration composed of the bright and the dark resonators can be regarded as the classical analogue of the EIT262728293435. Here the width of the metal copper wires is . The gap size of the two rings is . The frequencies of the two resonant modes are designed to be the same at 23.56 GHz. The dephasing rates of the two resonators, , can be adjusted by two resistors , respectively. By putting the two resonators close to each other with a distance of , we can introduce the near-field coupling between the two modes. When a microwave of frequency propagates along the main-strip (incident from the left), we have input to the bright resonator () which excites . The dark resonator is far away from the main-strip, so that no input for the dark resonator. The dark mode is excited by the coupling between the two modes. The motion of the resonant modes is described by Eq. (5). After doing the full-wave simulations of the meta-atom with the chosen geometric parameters, we have , , and , 39. Then we can adjust and to have different and .


Dephasing-Induced Control of Interference Nature in Three-Level Electromagnetically Induced Tansparency Systems.

Sun Y, Yang Y, Chen H, Zhu S - Sci Rep (2015)

Experimental setup to simulate the dephasing-induced control of interference in atomic EIT system.Transmission and reflection coefficients are measured with the microwave network analyzer. The EIT meta-atom consists of a “bright” resonator, a “dark” resonator, the pair of split rings. The near-field coupling strength between the two resonators is determined by the separation , and the dephasing rates of the two resonators, , can be adjusted by two resistors , respectively. Geometric parameters can be found in the Main Text.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4644959&req=5

f4: Experimental setup to simulate the dephasing-induced control of interference in atomic EIT system.Transmission and reflection coefficients are measured with the microwave network analyzer. The EIT meta-atom consists of a “bright” resonator, a “dark” resonator, the pair of split rings. The near-field coupling strength between the two resonators is determined by the separation , and the dephasing rates of the two resonators, , can be adjusted by two resistors , respectively. Geometric parameters can be found in the Main Text.
Mentions: Our experiments are conducted by using meta-atom in microwave range. The experimental setup is shown in Fig. 4. The meta-atom is composed of two coupled resonators. The bright resonator () is a copper branch with the length of , and it is connected with the main-strip by the resistor , as indicted in the middle of Fig. 4. The dark resonator () is composed of two metal split rings with the dimensions of , which are located at the two sides of the first resonator. It has been demonstrated that the response of this configuration composed of the bright and the dark resonators can be regarded as the classical analogue of the EIT262728293435. Here the width of the metal copper wires is . The gap size of the two rings is . The frequencies of the two resonant modes are designed to be the same at 23.56 GHz. The dephasing rates of the two resonators, , can be adjusted by two resistors , respectively. By putting the two resonators close to each other with a distance of , we can introduce the near-field coupling between the two modes. When a microwave of frequency propagates along the main-strip (incident from the left), we have input to the bright resonator () which excites . The dark resonator is far away from the main-strip, so that no input for the dark resonator. The dark mode is excited by the coupling between the two modes. The motion of the resonant modes is described by Eq. (5). After doing the full-wave simulations of the meta-atom with the chosen geometric parameters, we have , , and , 39. Then we can adjust and to have different and .

Bottom Line: The nature of the interference, constructive, no interference or destructive, can be controlled by adjusting the dephasing rates.This new phenomenon is experimentally observed in meta-atoms.The physics behind the dephasing-induced control of interference nature is the competing between stimulated emission and spontaneous emission.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Advanced Micro-structure Materials (MOE) and School of Physics Sciences and Engineering, Tongji University, Shanghai 200092, China.

ABSTRACT
The influence of the dephasing on interference is investigated theoretically and experimentally in three-level electromagnetically induced transparency systems. The nature of the interference, constructive, no interference or destructive, can be controlled by adjusting the dephasing rates. This new phenomenon is experimentally observed in meta-atoms. The physics behind the dephasing-induced control of interference nature is the competing between stimulated emission and spontaneous emission. The random phase fluctuation due to the dephasing will result in the correlation and anti-correlation between the two dressed states, which will enhance and reduce the stimulated emission, respectively.

No MeSH data available.


Related in: MedlinePlus