Tailoring the photon emission patterns in nanostructures

Guo, Shi-Fang; Duan, Suqing; Xie, Yan; Chu, Weidong; Zhang, Wei

doi:10.1088/1367-2630/13/5/053005

Cited by 5 publications

(9 citation statements)

References 46 publications

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“…Then odd harmonics alone are generated because of the spatial-temporal symmetry. Other types of spatial-temporal symmetry may lead to many interesting emission patterns 20 . Here we give some analysis on the hyper-Raman lines and their relation to the harmonic components.…”

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confidence: 99%

“…It can be easily obtained from natural systems (such as atoms, molecules, and semiconductors) and artificial structures (such as quantum dots). The large energy spacing makes it robust against thermal fluctuation and also insensitive to the initial state 20 . Our mechanism based on the symmetry principle is different from those (based on four-wave mixing 8 or transit current 30 ) used before.…”

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confidence: 99%

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Terahertz wave generation from hyper-Raman lines in two-level quantum systems driven by two-color lasers

Zhang¹,

Guo²,

Duan³

et al. 2013

Opt. Express

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Based on spatial-temporal symmetry breaking mechanism, we propose a novel scheme for terahertz (THz) wave generation from hyper-Raman lines associated with the 0th harmonic (a particular even harmonic) in a two-level quantum system driven by two-color laser fields. With the help of analysis of quasi-energy, the frequency of THz wave can be tuned by changing the field amplitude of the driving laser. By optimizing the parameters of the laser fields, we are able to obtain arbitrary frequency radiation in the THz regime with appreciable strength (as strong as the typical harmonics). Our proposal can be realized in experiment in view of the recent experimental progress of even-harmonics generation by two-color laser fields.PACS numbers: 42.65. Ky, 42.50.Hz, 78.20.Bh Introduction Terahertz (THz) radiation, electromagnetic radiation with typical frequency from 0.1 THz to 10 THz-lying in the spectrum gap between the infrared and microwaves, has varieties of applications in information and communication technology, biology and medical sciences, homeland security, and global environmental monitoring etc.1 . The generation of THz wave is a challenge problem due to the lack of appropriate materials with small bandgaps in the usual optical approach. Great effort has been made to the design of THz sources 2-15 . THz wave can be obtained by both electronic and optical methods. The uni-travelling-carrier photodiode 6 and the quantum cascade laser 9-13 are two examples. The electronic approach is limited in the low frequency end of the THz regime, and the optical approach usually focuses on the cases of small energy gap. Technological innovation in photonics and nanotechnology has provided us more new ways for THz radiation generation. Recently an interesting approach based on semiconductor nanostructure driven by acoustic wave was suggested 16 , and electrically pumped photonic-crystal THz laser was developed 17 . THz wave generation by up conversion method through high-order harmonics generation(HHG) in semiconductor quantum dot(QD) was also suggested in our previous work 18 .

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confidence: 99%

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confidence: 99%

Terahertz wave generation from hyper-Raman lines in two-level quantum systems driven by two-color lasers

Zhang¹,

Guo²,

Duan³

et al. 2013

Opt. Express

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“…As was demonstrated in our previous paper [31], for a quantum system described by the Hamiltonian in Eq. (1), if there exists one symmetric operation Q, which is the time shift θ : t → t + T /2(T = 2π/ω 0 ) combined with another operation in the spatial domain, i.e., Q = θ , such that the initial condition and the Hamiltonian (up to a sign) are invariant, and the dipole operatorP has a definite parity, then the emission spectrum contains no odd or even component if operatorP is even or odd.…”

Section: Tailoring Emission Spectramentioning

confidence: 53%

“…In our recent work, we provided a selection rule based on a spatialtemporal symmetry and studied tailoring photon emission patterns in driven coupled quantum dots [31]. In this Brief Report, based on the symmetry principle we propose a more efficient and flexible scheme for even-harmonics generation in coupled QDs.…”

Section: Introductionmentioning

confidence: 99%

Generation of even harmonics in coupled quantum dots

et al. 2011

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Using the spatial-temporal symmetry principle we developed recently, we propose an effective scheme for even-harmonics generation in coupled quantum dots. The relative intensity of odd and even harmonic components in the emission spectrum can be controlled by tuning the dipole couplings among the dots, which can be realized in experiments by careful design of the nanostructures. In particular, pure 2nth harmonics and (2n + 1)th harmonics (where n is an integer) can be generated simultaneously with polarizations in two mutual perpendicular directions in our systems. An experimental design of the coupled dots system is presented.

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“…Compared to real benzene, the artificial molecule has been shown to present characteristic double plateaus in the spectrum [22]. Finally, HHG in the THz range has been studied in mesoscopic rings with a localized impurity [23], and even harmonics production have been investigated in coupled quantum dots [24,25].…”

Section: Introductionmentioning

confidence: 99%

Laser driven structured quantum rings

Castiglia¹,

Corso²,

Giovannini³

et al. 2015

J. Phys. B: At. Mol. Opt. Phys.

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In this work we study harmonic emission from structured quantum rings (SQRs). In SQRs, electrons trapped in two-dimensional structures are further confined by an external potential composed of N scattering centers arranged on a circle. We build a suitable one-dimensional model Hamiltonian describing this class of systems and analytically solve the associated Schödinger equation. We find that the solution can be expressed in terms of Mathieu functions and focus on the specific case of N = 6. By exactly solving the time-dependent Schödinger equation, we then show how the harmonic response to linearly polarized lasers strongly depends on the ring physical parameters. The results illustrate how the additional degrees of freedom introduced by these parameters, provide important handles to control the emitted spectrum that in some cases extends into the XUV region.

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Tailoring the photon emission patterns in nanostructures

Cited by 5 publications

References 46 publications

Terahertz wave generation from hyper-Raman lines in two-level quantum systems driven by two-color lasers

Terahertz wave generation from hyper-Raman lines in two-level quantum systems driven by two-color lasers

Generation of even harmonics in coupled quantum dots

Laser driven structured quantum rings

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