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Spectrum Cascade Bloch Oscillations in Temporally Modulated Acoustics | Chengzhi Qin
; Yugui Peng
; Ying Li
; Xuefeng Zhu
; Bing Wang
; Cheng-Wei Qiu
; Peixiang Lu
; | Date: |
17 Nov 2018 | Abstract: | Bloch oscillations (BOs) refer to a periodically oscillatory motion of
particle in lattice systems driven by a constant force. By temporally
modulating acoustic waveguides, BOs can be generalized from spatial to
frequency domain, opening new possibilities for spectrum manipulations. The
modulation can induce mode transitions in the waveguide band and form an
artificial frequency lattice, with the mismatched wave vector during
transitions acting as a constant force that drives frequency Bloch oscillations
(FBOs). Furthermore, the modulation phase accompanying transitions serves as a
gauge potential that controls the initial oscillation phase, providing an
additional degree of freedom to tailor FBOs. We report that multiple FBOs with
judiciously designed oscillation phases can be further cascaded to realize
acoustic spectrum self-imaging, unidirectional transduction and bandwidth
engineering. The study proposes the concept of FBOs in acoustic systems and
functionalizes its cascade configurations for advanced control of sound
spectrum. This paradigm may find versatile applications in underwater secure
communication, voice encryption and signal processing. | Source: | arXiv, 1811.7121 | Services: | Forum | Review | PDF | Favorites |
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