4.8 Article

Buckling-Mediated Phase Transitions in Nano-Electromechanical Phononic Waveguides

期刊

NANO LETTERS
卷 21, 期 15, 页码 6416-6424

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c00764

关键词

waveguide; buckling; metamaterials; NEMS; phonon; nonlinearity

资金

  1. NSF Emerging Frontiers Research Initiative (EFRI) [1741565]
  2. NSF-CAREER Award [CMMI-1846732]
  3. NSF through the University of Illinois Materials Research Science and Engineering Center [DMR-1720633]
  4. Emerging Frontiers & Multidisciplinary Activities
  5. Directorate For Engineering [1741565] Funding Source: National Science Foundation

向作者/读者索取更多资源

Thermal induced elastic buckling of resonators in waveguides can lead to phase transitions, allowing reversible control of signal transmission. The merging of lower and upper band gaps results in localized signals at the excitation boundary, opening up opportunities for drastic phononic band reconfiguration in on-chip circuitry and computing.
Waveguides for mechanical signal transmission in the megahertz to gigahertz regimes enable on-chip phononic circuitry, which brings new capabilities complementing photonics and electronics. Lattices of coupled nano-electromechanical drumhead resonators are suitable for these waveguides due to their high Q-factor and precisely engineered band structure. Here, we show that thermally induced elastic buckling of such resonators causes a phase transition in the waveguide leading to reversible control of signal transmission. Specifically, when cooled, the lowest-frequency transmission band associated with the primary acoustic mode vanishes. Experiments show the merging of the lower and upper band gaps, such that signals remain localized at the excitation boundary. Numerical simulations show that the temperature-induced destruction of the pass band is a result of inhomogeneous elastic buckling, which disturbs the waveguide's periodicity and suppresses the wave propagation. Mechanical phase transitions in waveguides open opportunities for drastic phononic band reconfiguration in on-chip circuitry and computing.

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