Terahertz radiation in semiconductor quantum dots driven by gigahertz waves: The role of tailoring the quasienergy spectrum

Duan, Suqing; Zhang, Wei; Xie, Yan; Chu, Weidong; Zhao, Xian-Geng

doi:10.1103/physrevb.80.161304

Cited by 8 publications

(8 citation statements)

References 25 publications

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“…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%

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%

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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“…The high-order harmonic generation (HHG) in semiconductor nanostructures [1][2][3][4][5][6][7] and atomic and molecular systems [8][9][10][11][12][13][14], and bulk material [15][16][17], has been paid much attention during the last several decades. The great interest in this topic is due to its importance in the understanding of nonlinear optical processes in laser-matter interacting systems, as well as its extensive applications, such as the source of attosecond extreme ultraviolet (XUV), soft x-ray pulses [18][19][20], terahertz (THz) spectra, etc.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, THz wave generation by the up-conversion method through HHG in a semiconductor quantum dot (QD) was suggested recently in Ref. [3].…”

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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“…[1][2][3][4] Most recently, the HHG study is extended to semiconductor quantum dots ͑QDs͒ and coupled QDs ͑CQDs͒, the so-called "artificial atoms and molecules." [5][6][7] One motivation of the study of the HHG in QDs is to find an efficient way of terahertz wave generation due to their controllable energy spectra and wave functions.…”

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confidence: 99%

“…For example, there are only odd harmonics in the two-level QDs with or without the inversion symmetry. [5][6][7] In this work, we explore the dynamic behaviors of an electron in lateral-coupled triple-QD structures ͑TQDSs͒ under driving fields and reveal the selection rule of HHG in multilevel systems without the inversion symmetry.…”

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Model of generating either odd or even optical harmonics by varying the coupling parameters between source quantum dots

et al. 2010

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We show that the high harmonics generation ͑HHG͒ in quantum dot structures can be changed from only odd orders to both odd and even orders by controlling the coupling parameters. We find that even harmonics cannot be generated in a multilevel system if the electronic levels can be classified into groups by the parity of oscillation modes ͑the Fourier components of Floquet states͒ and the radiative transitions within same group are forbidden. Otherwise both odd and even harmonics are possible. According to the two distinct dynamic behaviors of HHG, we obtain a straightforward judgement of HHG in any multilevel systems.

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Terahertz radiation in semiconductor quantum dots driven by gigahertz waves: The role of tailoring the quasienergy spectrum

Cited by 8 publications

References 25 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

Model of generating either odd or even optical harmonics by varying the coupling parameters between source quantum dots

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