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Time Circular Birefringence in Time-Dependent Magnetoelectric Media.

Zhang RY, Zhai YW, Lin SR, Zhao Q, Wen W, Ge ML - Sci Rep (2015)

Bottom Line: The superposition of the two TCB modes causes the "time Faraday effect", namely the globally unified polarization axes rotate with time.If the wave-vector spectrum of a pulse mainly concentrates in the non-traveling-wave band, the pulse will be trapped with nearly fixed center while its intensity will grow rapidly.In addition, we propose an experimental scheme of using molecular fluid with external time-varying electric and magnetic fields both parallel to the direction of light to realize these phenomena in practice.

View Article: PubMed Central - PubMed

Affiliation: Theoretical Physics Division, Chern Institute of Mathematics, Nankai University, Tianjin, 300071, China.

ABSTRACT
Light traveling in time-dependent media has many extraordinary properties which can be utilized to convert frequency, achieve temporal cloaking, and simulate cosmological phenomena. In this paper, we focus on time-dependent axion-type magnetoelectric (ME) media, and prove that light in these media always has two degenerate modes with opposite circular polarizations corresponding to one wave vector , and name this effect "time circular birefringence" (TCB). By interchanging the status of space and time, the pair of TCB modes can appear simultaneously via "time refraction" and "time reflection" of a linear polarized incident wave at a time interface of ME media. The superposition of the two TCB modes causes the "time Faraday effect", namely the globally unified polarization axes rotate with time. A circularly polarized Gaussian pulse traversing a time interface is also studied. If the wave-vector spectrum of a pulse mainly concentrates in the non-traveling-wave band, the pulse will be trapped with nearly fixed center while its intensity will grow rapidly. In addition, we propose an experimental scheme of using molecular fluid with external time-varying electric and magnetic fields both parallel to the direction of light to realize these phenomena in practice.

No MeSH data available.


Related in: MedlinePlus

Illustration of circularly polarized pulse traveling in a fluid of diamagnetic molecules located in time-dependent external electric field  and magnetic field  both parallel to the propagating direction of the pulse.For the three-piece product , the fluid acts as a time wave plate. At t0, the incident pulse splits into a refracted one and a reflected one. At t1, the two pulses further split into four.
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f4: Illustration of circularly polarized pulse traveling in a fluid of diamagnetic molecules located in time-dependent external electric field and magnetic field both parallel to the propagating direction of the pulse.For the three-piece product , the fluid acts as a time wave plate. At t0, the incident pulse splits into a refracted one and a reflected one. At t1, the two pulses further split into four.

Mentions: As a result, the effective axion field can be controlled via the external electric and magnetic fields. If the product of the external fields changes with time, we could observe the TCB and correlated phenomena predicted in this paper. The schematic illustration are shown in Fig. 4.


Time Circular Birefringence in Time-Dependent Magnetoelectric Media.

Zhang RY, Zhai YW, Lin SR, Zhao Q, Wen W, Ge ML - Sci Rep (2015)

Illustration of circularly polarized pulse traveling in a fluid of diamagnetic molecules located in time-dependent external electric field  and magnetic field  both parallel to the propagating direction of the pulse.For the three-piece product , the fluid acts as a time wave plate. At t0, the incident pulse splits into a refracted one and a reflected one. At t1, the two pulses further split into four.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4556965&req=5

f4: Illustration of circularly polarized pulse traveling in a fluid of diamagnetic molecules located in time-dependent external electric field and magnetic field both parallel to the propagating direction of the pulse.For the three-piece product , the fluid acts as a time wave plate. At t0, the incident pulse splits into a refracted one and a reflected one. At t1, the two pulses further split into four.
Mentions: As a result, the effective axion field can be controlled via the external electric and magnetic fields. If the product of the external fields changes with time, we could observe the TCB and correlated phenomena predicted in this paper. The schematic illustration are shown in Fig. 4.

Bottom Line: The superposition of the two TCB modes causes the "time Faraday effect", namely the globally unified polarization axes rotate with time.If the wave-vector spectrum of a pulse mainly concentrates in the non-traveling-wave band, the pulse will be trapped with nearly fixed center while its intensity will grow rapidly.In addition, we propose an experimental scheme of using molecular fluid with external time-varying electric and magnetic fields both parallel to the direction of light to realize these phenomena in practice.

View Article: PubMed Central - PubMed

Affiliation: Theoretical Physics Division, Chern Institute of Mathematics, Nankai University, Tianjin, 300071, China.

ABSTRACT
Light traveling in time-dependent media has many extraordinary properties which can be utilized to convert frequency, achieve temporal cloaking, and simulate cosmological phenomena. In this paper, we focus on time-dependent axion-type magnetoelectric (ME) media, and prove that light in these media always has two degenerate modes with opposite circular polarizations corresponding to one wave vector , and name this effect "time circular birefringence" (TCB). By interchanging the status of space and time, the pair of TCB modes can appear simultaneously via "time refraction" and "time reflection" of a linear polarized incident wave at a time interface of ME media. The superposition of the two TCB modes causes the "time Faraday effect", namely the globally unified polarization axes rotate with time. A circularly polarized Gaussian pulse traversing a time interface is also studied. If the wave-vector spectrum of a pulse mainly concentrates in the non-traveling-wave band, the pulse will be trapped with nearly fixed center while its intensity will grow rapidly. In addition, we propose an experimental scheme of using molecular fluid with external time-varying electric and magnetic fields both parallel to the direction of light to realize these phenomena in practice.

No MeSH data available.


Related in: MedlinePlus