Search results for: Ren-Gang Wan

Items from 1 to 18 out of 18 results

article

Two-dimensional electromagnetically induced grating via nonlinear modulation in a five-level atomic system

Zhuan-Zhuan Liu, Yu-Yuan Chen, Jia-Yu Yuan, Ren-Gang Wan

Optics Communications > 2017 > 402 > C > 545-550

We theoretically propose a scheme for two-dimensional electromagnetically induced grating in a five-level atomic system interacting with two orthogonal standing-wave fields. In such atomic system, nonlinear absorption or refractivity can be significantly enhanced with nearly vanishing linear absorption under different resonant conditions. When applying two coupling fields with standing-wave pattern,...

article

Electromagnetically Induced Grating Without Absorption Using Incoherent Pump

Yu-Yuan Chen, Zhuan-Zhuan Liu, Ren-Gang Wan

International Journal of Theoretical Physics > 2017 > 56 > 10 > 3117-3128

We propose a scheme for creating electromagnetically induced grating in a four-level double- Λ atomic system driven by a coupling field and an incoherent pump field. Owing to the incoherent pumping process, large refractivity accompanied with vanishing absorption or even gain across the probe field can be built up in the atoms, thus phase grating or gain-phase grating, which diffracts a probe light...

article

Electromagnetically induced two-dimensional grating assisted by incoherent pump

Yu-Yuan Chen, Zhuan-Zhuan Liu, Ren-Gang Wan

Physics Letters A > 2017 > 381 > 16 > 1362-1368

We propose a scheme for realizing electromagnetically induced two-dimensional grating in a double-Λ system driven simultaneously by a coherent field and an incoherent pump field. In such an atomic configuration, the absorption is suppressed owing to the incoherent pumping process and the probe can be even amplified, while the refractivity is mainly attributed to the dynamically induced coherence....

article

Transient gain–absorption of the probe field in triple quantum dots coupled by double tunneling

Si-Cong Tian, Xiao-Jun Zhang, Ren-Gang Wan, Shuai Zhao, more

Optics Communications > 2016 > 368 > C > 129-133

The transient gain–absorption property of the probe field in a linear triple quantum dots coupled by double tunneling is investigated. It is found that the additional tunneling can dramatically affect the transient behaviors under the transparency condition. The dependence of transient behaviors on other parameters, such as probe detuning, the pure dephasing decay rate of the quantum dots and the...

article

Creation and Transfer of Coherence via Technique of Stimulated Raman Adiabatic Passage in Triple Quantum Dots

Si-Cong Tian, Ren-Gang Wan, Chun-Liang Wang, Shi-Li Shu, more

Nanoscale Research Letters > 2016 > 11 > 1 > 1-7

We propose a scheme for creation and transfer of coherence among ground state and indirect exciton states of triple quantum dots via the technique of stimulated Raman adiabatic passage. Compared with the traditional stimulated Raman adiabatic passage, the Stokes laser pulse is replaced by the tunneling pulse, which can be controlled by the externally applied voltages. By varying the amplitudes and...

article

Controllable cavity linewidth narrowing via spontaneously generated coherence in a four level atomic system

Si-Cong Tian, Ren-Gang Wan, Xiao-Nan Shan, Cun-Zhu Tong, more

Optics Communications > 2015 > 356 > C > 155-160

A scheme for cavity linewidth narrowing in a four-level atomic system with spontaneously generated coherence is proposed. The atomic system consists of three closely spaced excited levels, which decay to one common ground level. In such a system, spontaneously generated coherence can result in the appearance of two narrow transparency windows accomplished by steep normal dispersion. When the medium...

article

Tunneling induced transparency and giant Kerr nonlinearity in multiple quantum dot molecules

Si-Cong Tian, Ren-Gang Wan, En-Bo Xing, Jia-Min Rong, more

Physica E: Low-dimensional Systems and Nanostructures > 2015 > 69 > C > 349-353

The linear absorption and the Kerr nonlinearity of multiple quantum dots molecules controlled by the tunneling rather than the laser fields are investigated. The tunneling between the dots can induce multiple transparency windows. By varying the energy splitting of the excited states and the tunneling intensity, the width of the tunneling induced transparency windows can be narrowed. Within the narrowed...

article

Cavity linewidth narrowing by tunneling induced double dark resonances in triple quantum dot molecules

Si-Cong Tian, Ren-Gang Wan, Lian-He Li, Cun-Zhu Tong, more

Optics Communications > 2015 > 334 > Complete > 94-100

A scheme for obtaining a tunable ultranarrow cavity transmission controlled by two tunneling in triple quantum dots system is proposed. In such system, the tunneling can induce double dark resonances, resulting in the appearance of two transparency windows. With the steep dispersion within the narrowed transparency windows, an ultranarrow transmission peak can be obtained, compared with that of double...

article

Resolution and visibility of two-color pseudothermal lensless ghost imaging

Yu-Lang Xue, Ren-Gang Wan, Fei Feng, Tong-Yi Zhang

Optik - International Journal for Light and Electron Optics > 2014 > 125 > 16 > 4452-4455

Two-color (or nondegenerate-wavelength) lensless ghost imaging using pseudothermal light source is investigated theoretically by use of classical optical coherence theory. We find that for two-color pseudothermal lensless ghost imaging the visibility and resolution is determined by (Δ) the product of the wavelength and the corresponding path length rather than the wavelength for each path or the path...

article

Effect of turbulence on visibility and signal-to-noise ratio of lensless ghost imaging with thermal light

Yin-Ping Yao, Ren-Gang Wan, Shi-Wei Zhang, Tong-Yi Zhang

Optik - International Journal for Light and Electron Optics > 2013 > 124 > 24 > 6973-6977

Lensless ghost imaging with thermal light through turbulent atmosphere is investigated. Based on the extended Huygens–Fresnel integral and the classical optical coherence theory, we derive the expressions for the visibility and signal-to-noise ratio (SNR) of lensless ghost imaging through turbulence. To show the effect of turbulence on the quality of lensless ghost imaging, we numerically calculate...

article

Observation of spontaneously generated coherence on absorption in rubidium atomic beam

Si-Cong Tian, Zhi-Hui Kang, Chun-Liang Wang, Ren-Gang Wan, more

Optics Communications > 2012 > 285 > 3 > 294-299

We report the experimental observation of the effect of spontaneously generated coherence on absorption without the rigorous requirement of close-lying levels. The experiments are studied in both a four-level N-type and a four-level inverted-Y-type atomic system in a rubidium atomic beam. With the coupling and controlling field, the N-type system is equivalent to a system with three closely upper...

article

The atom-photon entanglement of a two-level system embedded in double-band photonic band edge

Li Jiang, Shan Du, Ren-Gang Wan, Jun Kou, more

Optics Communications > 2011 > 284 > 10-11 > 2509-2514

The entanglement of a two-level atom with its spontaneously emitted photon embedded in double-band anisotropic photonic crystal has been investigated via the method of the quantum entropy. Different from the case in an isotropic crystal or in vacuum, the entanglement has symmetrical properties and much slower entanglement rate near the two band edges. Moreover, as a result of the atom-photon bound...

article

Coherently induced double photonic band gaps in a driven N-type atomic system

Ren-Gang Wan, Jun Kou, Li Jiang, Shang-Qi Kuang, more

Optics Communications > 2011 > 284 > 6 > 1569-1574

In an N-type atomic system with double electromagnetically induced transparency, when the traveling-wave coupling field is replaced by a standing-wave, double fully developed photonic band gaps open up due to space-modulated refractive index within the two electromagnetically induced transparency widows. The dynamically induced band gaps can be tuned coherently, and have applications in manipulating...

article

Double dark resonances and the dispersion properties in a four-level inverted-Y atomic system

Jun Kou, Ren-Gang Wan, Shang-Qi Kuang, Li Jiang, more

Optics Communications > 2011 > 284 > 6 > 1603-1607

The electromagnetically induced transparency (EIT) and its dispersion properties in a four-level inverted-Y atomic system are investigated. The absorption spectrum of a weak probe field shows two EIT windows (dark resonances) whose location, width, and depth can be controlled by manipulating the parameters of the coupling fields; the corresponding dispersion properties are also measured by using a...

article

Two-dimensional atom localization via quantum interference in a coherently driven inverted-Y system

Ren-Gang Wan, Jun Kou, Li Jiang, Yun Jiang, more

Optics Communications > 2011 > 284 > 4 > 985-990

A scheme for two-dimensional (2D) subwavelength atom localization is proposed, in which the atom is in an inverted-Y configuration and driven by two orthogonal standing-wave lasers. Due to the spatial dependence of atom–field interaction, the quantities of system, including the frequency of spontaneously emitted photon, the population in the excited state, and the probe absorption, carry information...

article

Coherent control of spontaneous emission and radiation property in an anisotropic PBG

Li Jiang, Shan Du, Ren-Gang Wan, Jun Kou, more

Optics Communications > 2010 > 283 > 19 > 3714-3720

The spontaneous emission and radiation properties of a three-level atom driven by a phase-sensitive laser field in the anisotropic photonic crystal have been investigated. Due to the modified density in PC and the dynamical coherence induced by the coupling field, the population becomes oscillated and a fractionalized steady-state inversion appears in the two upper levels under certain initial conditions...

article

Polarization phase gate and three-photon GHZ state using coherently enhanced Kerr nonlinearity

Nuo Ba, Ren-Gang Wan, Bo-Nan Jiang, Heng Wang, more

Optics Communications > 2010 > 283 > 6 > 1017-1021

We study the nonlinear optical response of a five-level atomic system in the regimes of electromagnetically induced transparency and coherent Raman gain, corresponding to two different schemes of light–atom interaction. Our analytical and numerical results show that greatly enhanced Kerr nonlinearity and efficient cross phase modulation may be achieved between a weak probe field and a weak signal...

article

Measurement of coherence dynamics based on coherent anti-Stokes Raman scattering

Jun Kou, Ren-Gang Wan, Zhi-Hui Kang, Xiao-Jun Zhang, more

Optics Communications > 2009 > 282 > 23 > 4573-4576

Nanosecond time-resolved evolution of coherence between two nondegenerate ground levels has been investigated in Rb atomic vapor. Using STIRAP and fractional STIRAP, a time-dependent coherence is prepared and indirectly monitored by the generated coherent Raman scattering signal proportional to the coherence. The experimental data fit very well with numerical simulations. This technique have potential...

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Keywords

ELECTROMAGNETICALLY INDUCED TRANSPARENCY (5)
TRIPLE QUANTUM DOTS (3)
ELECTROMAGNETICALLY INDUCED GRATING (2)
INCOHERENT PUMP (2)
SPONTANEOUSLY GENERATED COHERENCE (2)
STIMULATED RAMAN ADIABATIC PASSAGE (2)
ATOMIC BEAM (1)
ATOMIC COHERENCE (1)
ATOMIC COHERENCE DYNAMICS (1)
CAVITY LINEWIDTH NARROWING (1)
CAVITY TRANSMISSION SPECTRUM (1)
COHERENT ANTI-STOKES RAMAN SCATTERING (1)
CREATION AND TRANSFER OF COHERENCE (1)
DIFFRACTION (1)
DIFFRACTION GRATING (1)
DOUBLE DARK RESONANCES (1)
ELECTROMAGNETICALLY INDUCED TRANSPARENCY (1)
FRACTIONAL STIMULATED RAMAN ADIABATIC PASSAGE (1)
INTRACAVITY ELECTROMAGNETICALLY INDUCED TRANSPARENCY (1)
KERR NONLINEARITY (1)
LENSLESS GHOST IMAGING (1)
LINEWIDTH NARROWING (1)
NONLINEAR MODULATION (1)
PSEUDOTHERMAL LIGHT SOURCE (1)
QUANTUM DOTS MOLECULES (1)
REFRACTIVE INDEX ENHANCEMENT (1)
RESOLUTION AND VISIBILITY (1)
SIGNAL-NOISE-ROTE RATIO (SNR) (1)
TRANSIENT EVOLUTION (1)
TUNNELING INDUCED TRANSPARENCY (1)
TURBULENCE (1)
TWO-COLOR LENSLESS GHOST IMAGING (1)
TWO-DIMENSIONAL ELECTROMAGNETICALLY INDUCED GRATING (1)
TWO-DIMENSIONAL GRATING (1)
VISIBILITY (1)
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Elsevier (16)
Springer (2)

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Search results for: Ren-Gang Wan

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