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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

Calculated absorption spectra for upper-level coupled three-level system, which is proportional to the real part of .The magnitude of absorption at the resonance frequency gradually decreases with . For , the absorption spectrum equals to the sum of two Lorentzian peaks with the same linewidth  (Blue). For  (), constructive (destructive) interference of the absorption is observed at the resonance frequency.
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f3: Calculated absorption spectra for upper-level coupled three-level system, which is proportional to the real part of .The magnitude of absorption at the resonance frequency gradually decreases with . For , the absorption spectrum equals to the sum of two Lorentzian peaks with the same linewidth (Blue). For (), constructive (destructive) interference of the absorption is observed at the resonance frequency.

Mentions: For the scheme we have and , with and the dephasing rates for and , respectively. If the dephasing rate is very small compared with , we have , leading to almost complete destructive interference at . If we have very large dephasing rate compared with , which can be realized by adding some collision mechanism with level (not level ), we will have , resulting in almost complete constructive interference at . By changing the dephasing rate from small to large, we can have from almost complete destructive interference to no interference, and then to constructive interference. In Fig. 3, we plot the real part of for the scheme with different from to with and . The blue curve is a sum of two Lorentzians for . From Fig. 3 we can see clearly the transition from complete destructive interference (red curve) to constructive interference (orange curve). Similar curves can be found for the cascade EIT scheme, from almost complete constructive () to almost complete destructive () interference by changing only the dephasing rates.


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

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

Calculated absorption spectra for upper-level coupled three-level system, which is proportional to the real part of .The magnitude of absorption at the resonance frequency gradually decreases with . For , the absorption spectrum equals to the sum of two Lorentzian peaks with the same linewidth  (Blue). For  (), constructive (destructive) interference of the absorption is observed at the resonance frequency.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: Calculated absorption spectra for upper-level coupled three-level system, which is proportional to the real part of .The magnitude of absorption at the resonance frequency gradually decreases with . For , the absorption spectrum equals to the sum of two Lorentzian peaks with the same linewidth (Blue). For (), constructive (destructive) interference of the absorption is observed at the resonance frequency.
Mentions: For the scheme we have and , with and the dephasing rates for and , respectively. If the dephasing rate is very small compared with , we have , leading to almost complete destructive interference at . If we have very large dephasing rate compared with , which can be realized by adding some collision mechanism with level (not level ), we will have , resulting in almost complete constructive interference at . By changing the dephasing rate from small to large, we can have from almost complete destructive interference to no interference, and then to constructive interference. In Fig. 3, we plot the real part of for the scheme with different from to with and . The blue curve is a sum of two Lorentzians for . From Fig. 3 we can see clearly the transition from complete destructive interference (red curve) to constructive interference (orange curve). Similar curves can be found for the cascade EIT scheme, from almost complete constructive () to almost complete destructive () interference by changing only the dephasing rates.

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