Vortex-based all-optical manipulation of stored light at low light levels

Zhao, Lu

doi:10.1364/oe.23.029808

Cited by 7 publications

(3 citation statements)

References 41 publications

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“…It is well-known that 2D optical diffraction is a fundamental operation for multimode spatial information processing 35 , 39 . Our 2D EIPG scheme could be combined with other models in atomic EIT systems to find potential applications in polarization-dependent beam splitting and fanning 12 – 14 , image processing 40 – 42 , and vortex manipulation 43 – 45 , which may further improve the capacity and speed for parallel signal processing by all-optical means.…”

Section: Resultsmentioning

confidence: 99%

Electromagnetically induced polarization grating

Zhao

2018

Sci Rep

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Based on electromagnetically induced transparency (EIT), we investigate an all-optical grating structure to realize polarization-dependent multiple beam splitting in the Raman-Nath limit. To optimize the grating performance, higher excited state [e.g., nS1/2 (n ≥ 6)] of ultracold 87Rb atoms is employed to construct a five-level Ξ-Λ system sharing one common populated ground state. A principal advantage of our proposed scheme is that the σ± components of a linearly polarized weak probe field can be decoupled and thus be independently diffracted with high efficiency in both one and two dimensions by exploiting different quasi-standing waves as the two strong coupling fields in the Ξ and Λ configurations. Such an all-optical polarization-sensitive operation could greatly enhance the tunability and capacity of all-optical multiplexing, interconnecting, and networking in free space for both classical and quantum applications.

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Section: Resultsmentioning

confidence: 99%

Electromagnetically induced polarization grating

Zhao

2018

Sci Rep

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“…To this end, EIT-based multilevel (more than three-level) atomic systems constitute many valuable candidates for few-photon quantum and nonlinear optics. For example, low-light-level or even a single-photon switch and transistor for slow and stored light can be constructed based on giant XPM between photons [16][17][18][19][20][21][22][23][24][25][26], which may also be helpful for quantum nondemolition detection [27].…”

Section: Introductionmentioning

confidence: 99%

Low-light-level spin–orbit splitting via structured light cross-Kerr interaction in coherent atomic media

Zhao

2023

Commun. Theor. Phys.

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We explore the spin-orbit coupling (SOC) mechanism for structured light in coherent atomic media with low-light-level cross-Kerr nonlinearity. Using the five-level M-type electromagnetic induced transparency (EIT) system as a prototype, we show that spin-orbit splitting for a weak spinor image can be generated by a weak trigger field carrying orbital angular momentum (OAM) at low-light intensity. By quantum-optical analogy, the paraxial focusing and defocusing of the two pseudo-spin states in the spinor image can be governed by a Pauli-like equation. More importantly, by changing the EIT parameters, especially the topological charge of the weak trigger field, the SOC-induced radial quantization of the spinor image can be rather significant, giving rise to positive or negative OAM-OAM mode separation in free space. This suggests that the separation can be flexibly controlled due to strong image-vortex interaction based on few-photon cross-Kerr modulation. Our findings may have the potential for all-optical OAM multiplexing and demultiplexing of structured light fields toward few-photon quantum control and multimode communication.

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“…人 [7,8] 提出EIT效应以来，研究人员已在不同的体系中实现了EIT效应，如冷原子体系 [9,10] 、热原子体系 [11,12] 、稀土离子掺杂晶体 [13,14] 等。相比原子气体，基于稀土离子掺杂晶体的固态量子存储体系，具有存储密度高、无原子运动带来的信息失真和易于集成等优势，非常适合于图像信息处理。目前，EIT效应已经被应用于光学信息图像存储 [15] 、涡旋光场操控 [16][17][18] 等领域。除了经典光领域的应用，EIT效应也被广泛应用于光量子存储 [19] 及量子逻辑门 [8] 等方向。青岛理工大学的邱田会等人从理论上设计了通过四能级系统的EIT效应和交叉相位调制引入的相位差的方法，实现两组光学图像加减操作的方案 [20] ，显示了EIT效应在全光操控及量子信息处理领域的潜在应用价值。不同于该方案，由于经过基于EIT效应存储的光脉冲，其复现光场的空间频率成分与信号光场、耦合光场和读取光场的空间频率成分均有关，同时带有不同光场的信息，因而可以通过操控各个光场的空间频率成分，实现对光学图像的特定操作。本文的主要工作就是基于掺镨硅酸钇(Pr:Y 2 SiO 5 , Pr:YSO)晶体的EIT效应实现无需提前制备频谱面滤波掩模版的光学图像动态加减操作。 2 理论分析通过EIT效应实现光脉冲存储的过程如下 [21] ：首先使用光谱烧孔技术在Pr:YSO晶体中完成Λ型三能 [22] 利用密度矩阵方程和波方程对光脉冲的存储和读取做了理论分析，表明经过存储和读取过程后…”

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Optical image addition and subtraction based on electromagnetically induced transparency effect

Liu¹,

Liu²,

Zhang³

2023

Acta Phys. Sin.

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The electromagnetically induced transparency (EIT) effect is a quantum coherence effect between different atomic transition channels. The absorption of the atomic ensemble is significantly reduced or even close to zero, while at the same time, the effect is accompanied with strong spectral dispersion near the atomic resonance frequency, which is widely used in group velocity control, light pulse storage, and coherent manipulation on the light field. In the light pulse storage based on the EIT effect, the retrieval field is determined by the signal, the coupling, and the readout fields, enabling dynamic control of the retrieval field by manipulating the spatial frequency components of the interacting light fields. In this paper, based on the EIT effect, we achieve experimentally the optical image addition and subtraction on the imaging plane of a 4f system through the coherent manipulation on the retrieval field via the interacting signal, coupling, and readout fields. Specifically, we first store the spatial frequency spectrum of a double-slit mask in the praseodymium-doped yttrium silicate crystal located at the confocal plane of the 4f system based on the EIT effect. Then, we utilize a specially designed mask containing the target objects and perform spatial filtering using the spatial frequency spectrum of the double-slit mask through the retrieval of stored light pulse. By moving the double-slit mask, addition and subtraction between the images of target objects can be achieved on the imaging plane of the 4f system. We present a theoretical model to describe the addition and subtraction between the target images through the EIT-based light pulse storage technique. The experimental results agree well with the theoretical prediction. As compared to the traditional scheme with a cosine grating filtering the spatial frequency spectrum, our method does not require the preparation of a spatial frequency filter, and only produces the first-order positive and negative diffraction images while without the influence of the zeroth-order diffraction image. The optical image addition and subtraction based on the EIT effect provide a new approach for optical image processing. This approach is not limited to image addition and subtraction, and it can be extended to achieve more complex operations such as differentiation, enhancement, encryption, and decryption with rational design. Therefore, it can be widely used in areas such as coherent manipulation of light fields and dynamic optical image processing.

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Vortex-based all-optical manipulation of stored light at low light levels

Cited by 7 publications

References 41 publications

Electromagnetically induced polarization grating

Electromagnetically induced polarization grating

Low-light-level spin–orbit splitting via structured light cross-Kerr interaction in coherent atomic media

Optical image addition and subtraction based on electromagnetically induced transparency effect

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