Optical bistability in a five-level cascade EIT medium: an analytical approach

Khoa, Dinh Xuan; Doai, Le Van; Anh, Le Nguyen Mai; Trung, Le Canh; Thuan, Phan Van; Dũng, Nguyễn Tiến; Bang, Nguyen Huy

doi:10.1364/josab.33.000735

Cited by 32 publications

(21 citation statements)

References 25 publications

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“…We have obtained EIA resonances with amplitude comparable with Our results thus disclose new paths for EIA applications, from state manipulation in fundamental physics and metrology, to tunable and narrowband optical and photonic devices. Examples include: atomic optical isolators [33,34], atom-based polarization filters and splitters, atomic filters with sub-MHz band [35][36][37], and cavity-less bistable systems and switches [38,39], all with potential for reduced dissipation, fast switching time and efficiency tunability, not to mention control of light group velocity [9] and novel photonic metamaterials [10]. …”

Section: Configurationmentioning

confidence: 99%

Tunable and polarization-controlled high-contrast bright and dark coherent resonances in potassium

et al. 2017

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We demonstrate high-contrast Electromagnetically Induced Absorption (EIA) bright resonances on the D 1 line of 39 K with characteristics comparable to those of the Electromagnetically Induced Transparency (EIT) dark resonances observed in the same conditions. EIA is produced by the interaction of a weak probe beam with the atomic ground state driven in a degenerate coherent superposition by either a co-or counterpropagating pump beam. We have obtained an order of magnitude increase of the EIA's contrast with respect to previous similar experiments, performed with other alkalis, without compromising its linewidth. Furthermore, we show that the magneto-optic resonances can be continuously tuned from EIT to EIA by changing the relative handedness of circular polarizations of pump and probe beams, or depending on whether they co-or counter-propagate. This opens new perspectives in the use of EIA in a broad range of physical domains and in a large wealth of potential applications in optics and photonics. Contrary to Coherent Population Trapping and Electromagnetically Induced Transparency (EIT) with their ultra-narrow linewidths [1][2][3][4][5][6][7][8], Electromagnetically Induced Absorption (EIA) has found limited applications, mainly due to its broader linewidth and significantly smaller contrast. Nonetheless, an increasing interest in EIA was recently generated in view of potential applications, such as enhancement of the group velocity of light [9] and photonic metamaterials [10].EIA linewidths of several tens of kiloHertz have been reported, either with bichromatic excitation of Zeeman sublevels[11] or in Hanle configuration [12][13][14]. Bi-chromatic Hanle configuration has been explored by using Rb D 1 and D 2 lines [15]. Low-contrast EIA, resulting from EIT on D 2 line, was reported. Higher contrast EIA has been observed in [16], although overlapped to large background, which could be detrimental for highly-selective applications. More recently, sub-kHz EIA resonances were observed in Rb [17] and Cs [18,19]. In both cases, however, the contrast was of only a few percents. A pump/probe scheme in Hanle configuration for high-contrast EIA was proposed in a buffered vapor cell [20]. To date, however, no experimental demonstration has been reported. Highcontrast EIA has been observed on the 87 Rb D 2 line by using a complex excitation scheme with three separate photonic fields [21], and was theoretically investigated in [22]. EIA was also observed in the Paschen-Back regime in a purely non-degenerate three-level ladder system in 87 Rb [23]. Furthermore, while Rb and Cs have been widely investigated, this is the first observation of EIA in K, confirming our preliminary results [24].In this Letter, we report on an alternative and simpler approach for large contrast EIA in Hanle configuration using a pump/probe excitation scheme. We have observed EIA resonance contrast exceeding 50% in thermal K vapor. In this case, hyperfine optical pumping, which accumulates atoms to levels non interacting with the light [25,26], ...

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Section: Configurationmentioning

confidence: 99%

Tunable and polarization-controlled high-contrast bright and dark coherent resonances in potassium

et al. 2017

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“…Indeed, OB in the multi-level systems has also been studied extensively, e.g., four-level EIT configurations with two controlling fields [123][124][125][126][127], and a Kobrak -Rice 5-level system [128] with four controlling fields. More recently, the OB model consisting of a five-level cascade EIT medium placed inside a ring cavity has been proposed [78]. We assume a medium of length L composed of Nfive-level cascade systems placed in a unidirectional ring cavity as shown in Fig.…”

Section: Controlling Optical Bistabilitymentioning

confidence: 99%

“…the input-output relationship for the probe field under the slowly varying envelop approximation is given as [78]:…”

Section: Controlling Optical Bistabilitymentioning

confidence: 99%

“…In order to overcome this lack, Bang and co-workers have recently developed an analytical method to represent the EIT spectrum [74][75][76]. Such analytical model supports several interesting works concerning giant Kerr nonlinearity [77], OB [78], generating optical nano-fiber (ONF) for guiding entangled beams [79], slowed multi-frequency light [80,81], and lossless propagation of light pulse [34,35].…”

Section: Introductionmentioning

confidence: 98%

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Controllable Optical Properties of Multiple Electromagnetically Induced Transparency in Gaseous Atomic Media

Bang¹,

Van²,

Xuan³

2019

Comm. in Phys.

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The advent of electromagnetically induced transparency (EIT) offered a new coherent material with exotic and controllable optical properties. Although, studies on single-EIT are described in detail for single-EIT, however, extension from single- to multi- EIT is currently of current interest due to it gains advantages in multi-channel optical communication, waveguides for optical signal processing and multi-channel quantum information processing. In this work, we review recent research works concerning multi-EIT and some related applications, as controlling group velocity of light, giant Kerr nonlinearity, optical bistability. A special attention of the review also gives for analytical interpretations of EIT spectrum, its dispersion and related applications such as EIT enhanced Kerr nonlinearity and optical bistability to give physics insight. From experimental point of view, a latest development for measuring multi-EIT spectrum and its dispersion in hot medium is presented and compared to theoretical analytical representations.

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“…The studies showed that the Kerr nonlinearity2 International Journal of Optics bistability in the three-level EIT system inside an optical ring cavity in the presence of Doppler broadening. Since then, aspects that influence OB hysteresis loop have been extensively investigated [16][17][18][19][20][21][22][23][24][25][26]. Similar optical bistability and vacuum Rabi splitting of ring cavity in EIT medium are well known theoretically and experimentally [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Optical Bistability in a Controllable Giant Self-Kerr Nonlinear Gaseous Medium under Electromagnetically Induced Transparency and Doppler Broadening

Minh

Van

Xuan

et al. 2018

International Journal of Optics

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We study optical bistability (OB) in a controllable giant self-Kerr nonlinear atomic gaseous medium placed in a unidirectional ring cavity. The medium is coherently excited by strong controlling field and a weak probe laser field under electromagnetically induced transparency (EIT) and Doppler broadening. In a weak field limit of the probe light, an analytic OB equation for the probe light field is derived as an analytic function of parameters of the controlling field and temperature of the medium. It is shown that OB characters can be manipulated with the parameters due to the controllable properties of the self-Kerr nonlinearity. Furthermore, enhancement of the Kerr nonlinearity reduces the switching intensity threshold and width of the OB.

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Optical bistability in a five-level cascade EIT medium: an analytical approach

Cited by 32 publications

References 25 publications

Tunable and polarization-controlled high-contrast bright and dark coherent resonances in potassium

Tunable and polarization-controlled high-contrast bright and dark coherent resonances in potassium

Controllable Optical Properties of Multiple Electromagnetically Induced Transparency in Gaseous Atomic Media

Optical Bistability in a Controllable Giant Self-Kerr Nonlinear Gaseous Medium under Electromagnetically Induced Transparency and Doppler Broadening

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