2019
DOI: 10.1063/1.5050917
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Controlling the harmonic conversion efficiency in semiconductor superlattices by interface roughness design

Abstract: In semiconductor superlattices, when Bragg oscillating electrons interact with an input electromagnetic field, frequency multiplication is possible. An ideal superlattice has a purely antisymmetric voltage current response and can thus produce only odd harmonics. However, real world superlattices can also have even harmonic response and that increases the range of possible output frequencies. These effects have been recently explained with a predictive model that combines an Ansatz solution for the Boltzmann E… Show more

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Cited by 35 publications
(30 citation statements)
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“…The experiments have been performed with GHz input leading to THz output, demonstrating full control and enhancement of the nonlinearities in terms of applied voltage and power, in a regime that can be studied with input fields from compact devices 19,20 . A clear-cut proof of the role of asymmetric flow in our own data is highlighted in Fig.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…The experiments have been performed with GHz input leading to THz output, demonstrating full control and enhancement of the nonlinearities in terms of applied voltage and power, in a regime that can be studied with input fields from compact devices 19,20 . A clear-cut proof of the role of asymmetric flow in our own data is highlighted in Fig.…”
Section: Resultsmentioning
confidence: 99%
“…References 18 , 19 summarize the realistic HHG efficiencies that can be achieved by coupling unbiased SSLMs with the most relevant commercially available compact GHz input sources. These type of devices exploit the radiation at odd harmonics of the input oscillating field, originating from the phase-modulated Bloch oscillations and under the assumption of a uniform electric-field distribution across the SSL sample.…”
Section: Introductionmentioning
confidence: 99%
“…3,49 However, by considering the influence of the asymmetry in current flow induced by interface roughness scattering, even harmonic generation can emerge. 2,5,39 The V-I characteristics described by Eq. (1) then should be modified according to…”
Section: Appendix: Even-order Responses Of the Ssl Multipliersmentioning
confidence: 99%
“…The conversion efficiency of even harmonics for an unbiased SL multiplier is far weaker from the performance of other available material systems. 9 Nevertheless, as has been discussed recently, 39 the optimization of the asymmetric effects in a heterostructure semiconductor, i.e. a systematic interface roughness design, can lead to significant enhancement of even harmonic output power.…”
Section: Appendix: Even-order Responses Of the Ssl Multipliersmentioning
confidence: 99%
“…Graphene and carbon nanotubes may serve as highly tunable sources and detectors of THz radiation [28][29][30][31][32][33][34], and even in THz lasers [35][36][37][38][39][40]. In the dual-gate graphene-channel field-effect transistor [41] embedded into a cavity resonator [42,43], one observes spontaneous broadband light emission in the 0.1-7.6 THz range with the maximum radiation power of ∼ 10 µW at the temperature 100 K. There are also emerging sources of THz radiation that operate at room temperature and can deliver several frequencies, e.g., multiple harmonic generation in superlattices that can also be made compact by coupling with a sled [44,45], frequency difference generation in mid infrared QCLs leading to tunable THz radiation [46] and THz optical combs [47].…”
mentioning
confidence: 99%