Voltage-controlled transmission through a dielectric slab doped with quantum dot molecules

Zohravi, Lida Ebrahimi; Mahmoudi, Mohammad

doi:10.3788/col201412.042601

Cited by 7 publications

(5 citation statements)

References 11 publications

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“…In this report, we have considered the quantum-dot molecule dielectric film to realize the quantum coherence following the work [18] of controlling the propagation of light via external gate voltage in dielectric film doped with quantum-dot molecules. The gate voltage driving the inner-dot tunneling can make the quantumdot molecule system exhibit quantum coherence-EIT.…”

Section: Discussionmentioning

confidence: 99%

“…As is well known, in a traditional atomic EIT, a control light couples the pair of 2 -1 and a weak probe light drives the transition of 0 -1 . Now in the present quantum-dot molecule (see Figure 1(a)), a low-frequency gate voltage plays the role of the control light, which excites the 2 -1 transition (causing inner-dot electron tunneling between two quantum dots in a quantum-dot molecular system [18]). …”

Section: Theoretical Mechanism Of Controllable Tunneling Of Light Thrmentioning

confidence: 99%

“…Besides, we should also take into account the quantum-dot molecules [13] [14] [15] [16]. A quantum-dot molecule is a system of two or more coupled quantum dots, where coherent electronic states form through inter-dot tunneling [17] [18]. There have been many interesting applications and effects realized in quantum-dot molecular media, e.g., optical bistability [19] [20], slow light [21] [22], resonance fluorescence [23], electron-hole excitons [24], quantum interference and unusual optical responses [25], as well as tripartite hybrid quantum entanglement [26].…”

Section: Introductionmentioning

confidence: 99%

“…Our study is performed based on the work of Zohravi and M. Mahmoudi [18]. We shall focus on the controllable tunneling effect via quantum coherence, including the multilevel transitions of quantum-dot molecules.…”

Section: Introductionmentioning

confidence: 99%

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Controllable Tunneling of Light through a Quantum-Dot-Molecule Dielectric Film via Electromagnetically Induced Transparency

Zeng¹,

Gu²,

Shen³

2017

OPJ

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Since discrete multilevel transitions of quantum-dot molecules driven by external electromagnetic fields can exhibit quantum coherence effects, such an optical characteristic can be utilized to control propagation of electromagnetic wave through a quantum-dot molecule dielectric film. Since inner-dot tunneling in quantum-dot molecules can be controlled by a gate voltage, destructive quantum coherence among multilevel transitions in quantum-dot molecule would give rise to EIT (electromagnetically induced transparency). In this report, we shall investigate controllable on-and off-resonance tunneling effects of an incident electromagnetic wave through such a quantum-dot-molecule dielectric film, of which the optical response is tuned by the switchable gate voltage. We have found from the theoretical mechanism that a high gate voltage can cause the EIT phenomenon of quantum-dot-molecule systems, and under the condition of on-resonance light tunneling through the thin film, the probe field will propagation without loss if the probe frequency detuning is zero. By taking advantage of these effects sensitive to the tunable gate voltage, such quantum coherence would be integrated in certain photonic structures, and some devices such as photonic switching and transistors can be designed. Transient evolution of optical characteristics in the quantum-dot-molecule dielectric film (once the tunable gate voltage is turned on or off) is also considered in this report.

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Section: Discussionmentioning

confidence: 99%

Section: Theoretical Mechanism Of Controllable Tunneling Of Light Thrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Controllable Tunneling of Light through a Quantum-Dot-Molecule Dielectric Film via Electromagnetically Induced Transparency

Zeng¹,

Gu²,

Shen³

2017

OPJ

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“…OB via tunneling induced transparency in QD molecules was also investigated [19] and the effect of incoherent pumping on OB has been studied [20]. Recently, OB behavior in a multifold QD molecule composed of five quantum dots has been controlled by tunneling coupling [21]. The transmission and reflection of an electromagnetic pulse through a dielectric slab doped with QD molecules were investigated [22].…”

mentioning

confidence: 99%

Low threshold optical bistability and superluminal light propagation using a dielectric slab via inter-dot tunneling

Taherzadeh¹,

Nasehi²,

Mahmoudi³

2015

Laser Phys.

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The optical bistability (OB) behavior of a dielectric slab doped with quantum dot (QD) molecules is investigated in the presence of the inter-dot tunneling effect. It is shown that the threshold point of OB reduces by increasing inter-dot tunneling as well as by reducing the slab thickness. It is worth noting that the threshold of OB in a slab doped with QD molecules is smaller, by at least one order of magnitude, in respect to free QD molecules. We find that the inter-dot tunneling induces a negative group delay to the reflected pulse and it propagates in the superluminal region. Such simple control can be used in all optical switching.

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Constructions of secure entanglement channels assisted by quantum dots inside single-sided optical cavities

Heo

Kang

Hong³

et al. 2017

Optics Communications

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Voltage-controlled transmission through a dielectric slab doped with quantum dot molecules

Cited by 7 publications

References 11 publications

Controllable Tunneling of Light through a Quantum-Dot-Molecule Dielectric Film via Electromagnetically Induced Transparency

Controllable Tunneling of Light through a Quantum-Dot-Molecule Dielectric Film via Electromagnetically Induced Transparency

Low threshold optical bistability and superluminal light propagation using a dielectric slab via inter-dot tunneling

Constructions of secure entanglement channels assisted by quantum dots inside single-sided optical cavities

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