Selective Optical Generation of Coherent Acoustic Nanocavity Modes

Winter, M. F. Pascual; Rozas, G.; Fainstein, A.; Jusserand, B.; Perrin, Bernard; Huynh, A.; Vaccaro, Pablo O.; Saravanan, S.

doi:10.1103/physrevlett.98.265501

Cited by 58 publications

(23 citation statements)

References 15 publications

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“…This gradual transition from real to virtual excitation has strong consequences regarding the selectivity of the optically generated coherent phonons. 13,[23][24][25] This conceptually explains the abrupt sign change of the electronic contribution to DR=R observed between 150 K and 100 K [see Fig. 3(a)], and the change in the acoustic components in Fig.…”

Section: -3mentioning

confidence: 69%

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Investigation of coherent acoustic phonons in terahertz quantum cascade laser structures using femtosecond pump-probe spectroscopy

Bruchhausen¹,

Lloyd‐Hughes²,

Hettich³

et al. 2012

Journal of Applied Physics

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The dynamics of acoustic vibrations in terahertz quantum cascade laser structures (THz-QCLs) is studied by means of femtosecond pump-probe spectroscopy. The phonon modes are characterized by the folding of the acoustic dispersion into an effective reduced Brillouin zone. An accurate identification of this dispersion allows the sample structure and periodicity to be determined with high precision on the order of 0.1%. By temperature tuning the energy of the electronic levels of the system and performing wavelength dependent measurements, we are able to study the impulsive resonant generation and detection of coherent acoustic phonon modes. These results are supported by simulations of the electronic system that well explain the experimental observations. The effects of interface (IF) roughness on coherent acoustic phonon spectra are clearly observed for equal nominal THz-QCL structures but with different interface qualities.

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Section: -3mentioning

confidence: 69%

“…4(b)], i.e., when the detection mechanism occurs due to the coupling to real carriers in the absorbing range to a regime where the sample is more transparent and the coupling is more virtual. 13,[23][24][25] In fact, the curve corresponding to k …”

Section: -3mentioning

confidence: 99%

Investigation of coherent acoustic phonons in terahertz quantum cascade laser structures using femtosecond pump-probe spectroscopy

Bruchhausen¹,

Lloyd‐Hughes²,

Hettich³

et al. 2012

Journal of Applied Physics

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show abstract

“…In these cases, the excitation laser should be resonant with the excitonic transition of the acoustic spacer, as described in Refs. [13,40].…”

Section: Interface Modes Through Materials Composition Tuningmentioning

confidence: 99%

“…The mass density and the speed of sound are usually condensed into a single parameter, the acoustic impedance (Z = ρv) [11,12]. Acoustic cavities have been used to study fundamental phenomena such as the confinement of acoustic phonons [10,13,14], their lifetimes [15] to control phonon propagation dynamics [10], and as efficient coherent phonon generators [13,16,17]. By coupling several acoustic resonators, it is furthermore possible to generate effective phononic potentials and to study, e.g., Bloch oscillations of acoustic phonons [12,18,19].…”

Section: Introductionmentioning

confidence: 99%

A Topological View on Optical and Phononic Fabry–Perot Microcavities through the Su–Schrieffer–Heeger Model

Esmann

Lanzillotti‐Kimura

2018

Applied Sciences

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Advances in nanofabrication technologies have enabled the study of acoustic wave phenomena in the technologically relevant GHz-THz range. First steps towards applying concepts from topology in nanophononics were made with the proposal of a new topological acoustic resonator, based on the concept of band inversion. In topology, the Su-Schrieffer-Heeger (SSH) model is the paradigm that accounts for the topological properties of many one-dimensional structures. Both the classical Fabry-Perot resonator and the reported topological resonators are based on Distributed Bragg Reflectors (DBRs). A clear and detailed relation between the two systems, however, is still lacking. Here, we show how a parallelism between the standard DBR-based acoustic Fabry-Perot type cavity and the SSH model of polyacetylene can be established. We discuss the existence of surface modes in acoustic DBRs and interface modes in concatenated DBRs and show that these modes are equivalent to Fabry-Perot type cavity modes. Although it is not possible to assign topological invariants to both acoustic bands enclosing the considered minigap in the nanophononic Fabry-Perot case, the existence of the confined mode in a Fabry-Perot cavity can nevertheless be interpreted in terms of the symmetry inversion of the Bloch modes at the Brillouin zone edge.

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“…Elastic waves in solids could also endure a periodic Young modulus and/or a periodic density. Studies on such systems are currently numerous 5,6,7 and lead to a new field of physics namely Phononics 8,9 .…”

Section: Introductionmentioning

confidence: 99%

Surface loving and surface avoiding modes

2009

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We theoretically study the propagation of sound waves in GaAs/AlAs superlattices focussing on periodic modes in the vicinity of the band gaps. Based on analytical and numerical calculations, we show that these modes are the product of a quickly oscillating function times a slowly varying envelope function. We carefully study the phase of the envelope function compared to the surface of a semi-infinite superlattice. Especially, the dephasing of the superlattice compared to its surface is a key parameter. We exhibit two kind of modes: Surface Avoiding and Surface Loving Modes whose envelope functions have their minima and respectively maxima in the vicinity of the surface. We finally consider the observability of such modes. While Surface avoiding modes have experimentally been observed (Phys. Rev. Lett. 97, 1224301 (2006)), we show that Surface Loving Modes are likely to be observable and we discuss the achievement of such experiments. The proposed approach could be easily transposed to other types of wave propagation in unidimensional semi-infinite periodic structures as photonic Bragg mirror.

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Selective Optical Generation of Coherent Acoustic Nanocavity Modes

Cited by 58 publications

References 15 publications

Investigation of coherent acoustic phonons in terahertz quantum cascade laser structures using femtosecond pump-probe spectroscopy

Investigation of coherent acoustic phonons in terahertz quantum cascade laser structures using femtosecond pump-probe spectroscopy

A Topological View on Optical and Phononic Fabry–Perot Microcavities through the Su–Schrieffer–Heeger Model

Surface loving and surface avoiding modes

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