• Photonics Research
  • Vol. 5, Issue 6, 676 (2017)
Feng Wen1、2, Huapeng Ye2, Xun Zhang1, Wei Wang1, Shuoke Li1, Hongxing Wang1、*, Yanpeng Zhang1, and Cheng-wei Qiu2
Author Affiliations
  • 1Key Laboratory for Physical Electronics and Devices of the Ministry of Education & School of Science & Shaanxi Key Laboratory of Information Photonic Technique & Institute of Wide Bandgap Semiconductors, Xi’an Jiaotong University, Xi’an 710049, China
  • 2Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583, Singapore
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    DOI: 10.1364/PRJ.5.000676 Cite this Article Set citation alerts
    Feng Wen, Huapeng Ye, Xun Zhang, Wei Wang, Shuoke Li, Hongxing Wang, Yanpeng Zhang, Cheng-wei Qiu. Optically induced atomic lattice with tunable near-field and far-field diffraction patterns[J]. Photonics Research, 2017, 5(6): 676 Copy Citation Text show less

    Abstract

    Conventional periodic structures usually have nontunable refractive indices and thus lead to immutable photonic bandgaps. A periodic structure created in an ultracold atoms ensemble by externally controlled light can overcome this disadvantage and enable lots of promising applications. Here, two novel types of optically induced square lattices, i.e., the amplitude and phase lattices, are proposed in an ultracold atoms ensemble by interfering four ordinary plane waves under different parameter conditions. We demonstrate that in the far-field regime, the atomic amplitude lattice with high transmissivity behaves similarly to an ideal pure sinusoidal amplitude lattice, whereas the atomic phase lattices capable of producing phase excursion across a weak probe beam along with high transmissivity remains equally ideal. Moreover, we identify that the quality of Talbot imaging about a phase lattice is greatly improved when compared with an amplitude lattice. Such an atomic lattice could find applications in all-optical switching at the few photons level and paves the way for imaging ultracold atoms or molecules both in the near-field and in the far-field with a nondestructive and lensless approach.
    H=GPeiΔPt|ab|+GeffeiΔ2t|bc|+h.c,(1)

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    χ=iN|μab|22ϵ0γaciΔ12Geff2(x)+(γabiΔ1)(γaciΔ12),(2)

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    EPz=(α/2+iσ)EP,(3)

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    T(x,y)=exp[α(x,y)L2+iσ(x,y)L].(4)

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    E(X,Y,Z)=dxdyT(x,y)exp[ikP(2Z+x2+y22ZxX+yY2Z+X2+Y22Z)],(5)

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    T(x,y)=m,n=Cmnexp[i(2πmax+2πnby)],(6)

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    Ψ(u1,u2;v1,v2)=C0n=cmn{exp[iπλPZ(m2a2+n2b2)]×exp[i2π(maX+nbY)]},(7)

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    I(θx,θy)=|J(θx,θy)|2sin2[Pπasin(θx/λP)]P2sin2[πasin(θx/λP)]×sin2[Qπbsin(θy/λP)]Q2sin2[πbsin(θy/λP)],(8)

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    Feng Wen, Huapeng Ye, Xun Zhang, Wei Wang, Shuoke Li, Hongxing Wang, Yanpeng Zhang, Cheng-wei Qiu. Optically induced atomic lattice with tunable near-field and far-field diffraction patterns[J]. Photonics Research, 2017, 5(6): 676
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