Observation of discrete diffraction patterns in an optically induced lattice

Sheng, Jiteng; Wang, Jing; Miri, Mohammad‐Ali; Christodoulides, Demetrios N.; Xiao, Min

doi:10.1364/oe.23.019777

Cited by 47 publications

(21 citation statements)

References 34 publications

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“…It has been shown that by applying a standing-wave beam, the higher order Fraunhofer diffraction can be obtained for a probe light due to the modulation of the refractive index. Recently, the discreet diffraction patterns established via optically induced atomic lattices have been also experimentally demonstrated 20 .…”

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Tunneling induced two-dimensional phase grating in a quantum well nanostructure via third and fifth orders of susceptibility

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Sahrai

Hamedi

et al. 2020

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We study the nonlinear optical properties in an asymmetric double AlGaAs/GaAs quantum well nanostructure by using an external control field and resonant tunneling effects. It is found that the resonant tunneling can modulate the third-order and fifth-order of susceptibilities via detuning frequency of coupling light. In presence of the resonant tunneling and when the coupling light is in resonance with the corresponding transition, the real parts of third-order and fifth-order susceptibilities are enhanced which are accompanied by nonlinear absorption. However, in off-resonance of coupling light, real parts of third-order and fifth-order susceptibilities enhance while the nonlinear absorption vanishes. We investigate also the two-dimensional electromagnetically induced grating (2D-EIG) of the weak probe light by modulating the third-order and fifth-order susceptibilities. In resonance of coupling light, both amplitude and phase grating are formed in the medium due to enhancement of third-order and fifth-order probe absorption and dispersion. When the coupling light is out of resonance, most of probe energy is transferred from zero-order to higher-order directions due to resonant tunneling effect. The efficiency of phase grating for third-order of susceptibility is higher than phase grating for fifthorder susceptibility. Our proposed model may be useful for optical switching and optical sensors based on semiconductor nanostructures.

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confidence: 99%

Tunneling induced two-dimensional phase grating in a quantum well nanostructure via third and fifth orders of susceptibility

Vafafard

Sahrai

Hamedi

et al. 2020

Sci Rep

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“…The standing-wave coupling field propagating along the z direction is responsible for establishing the optically induced lattice along the transverse direction x. By launching the weak signal field into the lattice, we can obtain discrete diffraction patterns [40], as well as the underlying spatially modulated susceptibility, under the EIT condition. Our results clearly indicate that by adding another standing-wave pump field, spatially periodic gain and loss regions with high contrast can be generated on the launched signal field.…”

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Observation of Parity-Time Symmetry in Optically Induced Atomic Lattices

et al. 2016

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We experimentally demonstrate PT-symmetric optical lattices with periodical gain and loss profiles in a coherently prepared four-level N-type atomic system. By appropriately tuning the pertinent atomic parameters, the onset of PT-symmetry breaking is observed through measuring an abrupt phase-shift jump between adjacent gain and loss waveguides. The experimental realization of such a readily reconfigurable and effectively controllable PT-symmetric waveguide array structure sets a new stage for further exploiting and better understanding the peculiar physical properties of these non-Hermitian systems in atomic settings.

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“…The optically induced lattice (along the transverse direction x) inside the atomic vapor cell is generated by interfering a pair of coupling laser fields from a same external cavity diode laser (ECDL). As a result, we can observe the spatially intensity-modulated probe field [28] at the output plane of the vapor cell, which implies the formation of the spatially distributed probe-field susceptibility in the atomic medium. The EIT-assisted Talbot effect is manifested through the repetition of the image on the output surface of the cell at the integer Talbot planes.…”

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“…With the near-parallel weak probe beam E 1 having an elliptical-Gaussian intensity profile from another ECDL1 launched into the induced lattice, the probe-field susceptibility can be spatially modulated under the EIT condition. [28,29] By carefully choosing the parameters such as frequency detunings and Rabi frequencies of the probe and coupling fields, clear diffracted probe beam pattern from the formed EIG can be observed at the output plane of the cell, which is monitored by utilizing a charge coupled device (CCD) camera (see Fig. 1) with an imaging lens.…”

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Observation of electromagnetically induced Talbot effect in an atomic system

et al. 2018

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We experimentally demonstrate the Talbot effect resulting from the repeated self-reconstruction of a spatially intensity-modulated probe field under the Fresnel near-field regime. By launching the probe beam into an optically induced atomic lattice (established by interfering two coupling fields) inside a rubidium vapor cell, we can obtain an diffracted probe beam pattern from an formed electromagnetically induced grating (EIG) in a three-level -type Doppler-free atomic configuration with the assistance of electromagnetically induced transparency (EIT). The EIG-based diffraction pattern repeats itself at the planes of integer multiple Talbot lengths, which agrees well with the theoretical prediction [Appl. Phys. Lett., 98, 081108 (2011)]. In addition, fractional EIT-induced Talbot effect was also investigated. Such experimentally demonstrated EIT Talbot effect in a coherently-prepared atomic system may pave a way for lensless and nondestructive imaging of ultracold atoms and molecules, and further demonstrating nonlinear/quantum beam dynamical features predicted for established periodic optical systems. The conventional Talbot effect characterized as a self-imaging or lensless imaging phenomenon was first implemented by launching a very weak white light into a Fraunhofer diffraction grating and observing the images of the same periodic structure at certain periodical distances with integer multiples of Talbot length [1, 2]. The wide practicability and simplicity of the self-imaging processes have inspired continuous and in-depth researches on the Talbot effect in various systems.[3] Since the invention of coherent light sources, studies of this near-field diffraction phenomenon have made great progresses not only in optics, such as optical measurements [4] and optical computing [5], but also in a variety of new areas including waveguide arrays [6], parity-time symmetric optics [7], X-ray diffraction [8],Bose-Einstein condensates [9], second-harmonic generation [10], quantum optics [11,12] and the recently proposed Airy-Talbot effect [13][14][15]. In 2011, the Talbot effect based on an

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Observation of discrete diffraction patterns in an optically induced lattice

Cited by 47 publications

References 34 publications

Tunneling induced two-dimensional phase grating in a quantum well nanostructure via third and fifth orders of susceptibility

Tunneling induced two-dimensional phase grating in a quantum well nanostructure via third and fifth orders of susceptibility

Observation of Parity-Time Symmetry in Optically Induced Atomic Lattices

Observation of electromagnetically induced Talbot effect in an atomic system

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