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In parallel, serpentine mechanical links engineered through their complex band structure are designed as compact mechanical mirrors and experimentally demonstrated as evanescent couplers for MHz flexural waves. In coupled-cavity devices, the normal-mode splitting decays exponentially with the number of serpentine cells, yielding an experimental attenuation constant in quantitative agreement with full-system simulations. Geometry-dependent measurements further show that the coupling can be tuned by the interconnect design and identify regimes where finite-link modes hybridize with the cavity modes, beyond a simple two-resonator picture. These results establish complex-band-engineered mechanical links as calibrated interconnects for scalable optomechanical nanocircuits based on optically addressable MHz flexural resonators.<\/jats:p>","DOI":"10.1088\/1361-6633\/aeb625","type":"journal-article","created":{"date-parts":[[2026,10,19]],"date-time":"2026-10-19T22:50:26Z","timestamp":1792450226000},"page":"107901","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Coupled flexural optomechanical cavities with engineered nanomechanical interconnects"],"prefix":"10.1088","volume":"89","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7804-8720","authenticated-orcid":true,"given":"David","family":"Alonso-Tom\u00e1s","sequence":"first","affiliation":[{"name":"MIND-IN2UB, Departament d\u2019Enginyeria Electr\u00f3nica i Biom\u00e9dica, Facultat de F\u00edsica, Universitat de Barcelona"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6458-5277","authenticated-orcid":false,"given":"Guillermo","family":"Arregui","sequence":"additional","affiliation":[{"name":"Swiss Federal Institute of Technology Lausanne (EPFL)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7686-0734","authenticated-orcid":false,"given":"Bingrui","family":"Lu","sequence":"additional","affiliation":[{"name":"DTU Electro, Technical University of Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5674-1666","authenticated-orcid":true,"given":"Sergei","family":"Lepeshov","sequence":"additional","affiliation":[{"name":"DTU Electro, Technical University of Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0991-041X","authenticated-orcid":false,"given":"S\u00f8ren","family":"Stobbe","sequence":"additional","affiliation":[{"name":"DTU Electro, Technical University of Denmark"},{"name":"NanoPhoton\u2014Center for Nanophotonics, Technical University of Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9055-1583","authenticated-orcid":true,"given":"Daniel","family":"Navarro-Urrios","sequence":"additional","affiliation":[{"name":"MIND-IN2UB, Departament d\u2019Enginyeria Electr\u00f3nica i Biom\u00e9dica, Facultat de F\u00edsica, Universitat de Barcelona"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2026,10,29]]},"reference":[{"key":"ropaeb625bib1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1927327","type":"journal-article","article-title":"Nanoelectromechanical systems","volume":"76","author":"Ekinci","year":"2005","journal-title":"Rev. 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