Coherent control of localization of a three-level atom by symmetric and asymmetric superpositions of two standing-wave fields

Dutta, Bibhas Kumar; Panchadhyayee, Pradipta; Mahapatra, P. K.

doi:10.1088/1054-660x/23/4/045201

Cited by 27 publications

(21 citation statements)

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“…2 . We must mention that, for the atom moving through the standing-wave fields, atom-field interaction energy is taken to be highly dominant over the kinetic energy of its centre-of-mass motion under the Raman-Nath approximation 18 i.e. the recoil of the atom during its passage through the standing-wave regime is neglected.…”

Section: Theoretical Formulationmentioning

confidence: 99%

“…Different fields of studies like atom nano-lithography 6 , laser cooling and trapping of neutral atoms 7 and Bose-Einstein condensation 8 have been enriched by the versatile applications of atom localization. The pioneering works 2,3,9,10 on atom localization involving energy and phase shifts with spatial variation are followed by studies in one dimension [11][12][13][14][15][16][17][18] , which describe the fundamental aspects of measurement-induced localization of atoms through a variety of atom-field configurations. To be more specific, an interesting property of coherent population trapping (CPT) is exploited in the study of atom localization 14 .…”

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confidence: 99%

“…To be more specific, an interesting property of coherent population trapping (CPT) is exploited in the study of atom localization 14 . The mechanism of electromagnetically induced transparency (EIT) is also taken into consideration in manipulating the localization pattern 11,18 . As explored in refs.…”

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Optical absorption microscopy of localized atoms at microwave domain: two-dimensional localization based on the projection of three-dimensional localization

Dutta¹,

Panchadhyayee

Bayal³

et al. 2020

Sci Rep

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A new approach for achieving two-dimensional (2D) atom localization microscopy based on the projection of three-dimensional (3D) localization in the plane of the detector is described in the present work. Spatial variation of the position-dependent 2D-localization pattern in the xy-plane is obtained with the shifting of the position of the detector along the z-axis under the parallel-and cross-axis configurations of the standing-wave fields. An attempt is made to study the 2D-localization characteristics in the specific parametric conditions for which the localization structures evolve with different shapes eventually leading to 100% detection probability of the atom both in the subwavelength and sub-half-wavelength regimes. The scope of tuning the cross-axis configuration over a wide range adds novelty and robustness to this model. Apart from the 2D-localization, various localization patterns with eight-to single-peak structures appear as interesting outcomes through the efficient manipulation of control parameters in the study of one-dimensional (1D) atom localization. The application of the traveling-wave field or its equivalent appears to be unique in achieving high-precision localization with maximal probability (100%) in both the 1D and 2D field-configuration schemes. Proper tuning of the traveling wave accompanied by the standing wave in the 1D scheme results in the singlepeak localization in the sub-half-wavelength range. As a whole, the present work seems to be very much efficient for high-precision optical lithography.

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Section: Theoretical Formulationmentioning

confidence: 99%

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confidence: 99%

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Optical absorption microscopy of localized atoms at microwave domain: two-dimensional localization based on the projection of three-dimensional localization

Dutta¹,

Panchadhyayee

Bayal³

et al. 2020

Sci Rep

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“…This research has many potential applications, which include trapping of neutral atoms, atom nanolithography and so on [1][2][3][4]. A large number of theoretical studies have been proposed by researchers for one-dimensional (1D) atom localization via the effect of atomic coherence and quantum interference [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. In these schemes, the position information of the atom has been correlated with the spatial distribution of the quantities, i.e., resonance fluorescence, level population, spontaneous emission, probe absorption and gain, due to the intensity modulation of a standing-wave field.…”

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confidence: 99%

High-precision three-dimensional atom localization in a three-level pump–probe atomic system

Zheng

Wang

2018

Can. J. Phys.

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We propose a new scheme for three-dimensional (3D) atom localization controlled by incoherent pump in a three-level Λ-type atomic system. The spatial position information of an atom in 3D space can be achieved via measuring probe gain and absorption when the atom passes through three mutually perpendicular standing-wave fields. It is found that high-detecting-probability and high-precision 3D atom localization can be obtained via properly adjusting the relevant parameters in the presence of the combination of a traveling-wave field and three orthogonal standing-wave fields. Furthermore, it is also shown that the incoherent pumping field can switch the localization patterns from the probe-gain sphere to the probe-absorption sphere and enhance 3D atom-localization precision.

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“…The highest theoretical localization degrees have been demonstrated in schemes that rely on measuring either spontaneous emission [10][11][12] or a level population [13,14] of an atom moving through a resonant standing wave.In general, as a proof-of-principle, one-dimensional systems have been very popular, see e.g. the recent studies [15][16][17][18][19][20]. Studies of atomic systems in two dimensions have also been numerous recently [21][22][23][24][25][26][27][28][29][30][31][32].…”

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Three-dimensional atom localization by laser fields in a four-level tripod system

2014

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We present a scheme of the high-precise three-dimensional (3D) localization by the measurement of the atomic-level population. The scheme is applied to a four-level tripod-type atom coupled by three strong standing waves and a probe running wave. As a result, the atom can be localized in volumes that are substantially smaller than a cubic optical wavelength. The upper-level distribution depends crucially on the atom-field coupling and it forms 3D periodic structures composed of spheres, hourglasses, bowls, donuts, or deformed barrels.PACS numbers: 42.50. Gy, 42.50.Nn, 42.50.Wk, 42.50.St The concept of Heisenberg microscope [1] demonstrates that atoms can not be localized using light within the optical half-wavelength unless one takes advantage of the internal structure of atoms. One approach is to obtain spatially changing structures in level populations in a cloud of atoms. Motivated e.g. by possible applications in atomic nanolithography [2], different methods for going beyond this limit have been proposed over the years, including the measurement of the atomic resonance frequency [3][4][5], the phase shift [6][7][8], or the atomic dipole [9]. The highest theoretical localization degrees have been demonstrated in schemes that rely on measuring either spontaneous emission [10][11][12] or a level population [13,14] of an atom moving through a resonant standing wave.In general, as a proof-of-principle, one-dimensional systems have been very popular, see e.g. the recent studies [15][16][17][18][19][20]. Studies of atomic systems in two dimensions have also been numerous recently [21][22][23][24][25][26][27][28][29][30][31][32]. It is important to note that in 2D, one can obtain, in addition to mere subwavelength localization, further spatial structuring of the atomic locations, see e.g. [33]. A key question is whether localization and structuring can be obtained also in 3D, and what kind of structures can appear. Possible applications may include high-precision position-dependent chemistry without a real change in the atomic distribution, combining state-selective localization with state-selective chemical reactions. In addition, 3D structuring produces a wide variety of practical realizations of such chemical reactions, demonstrating the necessity of reliable methods for the prediction of localization structures. For any realistic scheme one needs to carefully consider the atomic structure and to include spontaneous emission. Previously 3D localization has been discussed in a five-level system without taking the geometry of the atomic dipole coupling into account [34]. We show that 3D localization is realistically possible with only four atomic levels in a tripod scheme, and that one obtains interesting structures around points of localization by simple tuning of the parameters of the localizing fields.We consider the 87 Rb D 2 line (the 5 2 S 1/2 → 5 2 P 3/2 transition), which is only thought as a possible example of tripod system with three ground states |F = 1, m F (m F = −1, 0, 1) and upper state |F = 0, m...

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Coherent control of localization of a three-level atom by symmetric and asymmetric superpositions of two standing-wave fields

Cited by 27 publications

References 50 publications

Optical absorption microscopy of localized atoms at microwave domain: two-dimensional localization based on the projection of three-dimensional localization

Optical absorption microscopy of localized atoms at microwave domain: two-dimensional localization based on the projection of three-dimensional localization

High-precision three-dimensional atom localization in a three-level pump–probe atomic system

Three-dimensional atom localization by laser fields in a four-level tripod system

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