Tuning fork optomechanical NIR antenna with integrated optical transmission line
Khosh Maram, Daniyal (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Borrisé, Xavier (Institut Català de Nanociència i Nanotecnologia)
García García, Juan José (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Vandenbosch, Guy A.E. (KU Leuven. Department of Electrical Engineering)
Cartoixà Soler, Xavier (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Abadal Berini, Gabriel (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)

Date:	2026
Abstract:	We present a novel optomechanical antenna design that directly converts near-infrared (λ=1. 55 μm) light into mechanical motion using a tuning fork architecture with an integrated optical transmission line (OTL). The design consists of two parallel nanocantilever arms, made of gold-coated silicon nitride, forming a lateral tuning fork, with a plasmonic nanodipole antenna at the free end. Upon focused NIR laser illumination, our simulation results indicate that the nanodipole's feed gap concentrates the optical field and induces an oscillating voltage across the gap. This produces a strong DC electrostatic attraction between the tuning fork arms, causing an in-plane deflection. The integrated coplanar optical transmission line significantly enhances the antenna's performance by improving impedance matching, leading to nearly an order-of-magnitude higher gap voltage compared to designs without OTL. We verified the static mechanical response using COMSOL multiphysics simulations. An optimized design exhibits a lateral displacement up to 24. 6 nm at 8 mW optical power, which corresponds to a responsivity of 3 nm/mW at 1. 55 μm, outperforming previous NIR optomechanical transducers.
Grants:	Agencia Estatal de Investigación PID2021-127840NB-I00 Ministerio de Ciencia, Innovación y Universidades PID2024-161603NB-I00
Note:	Altres ajuts: acords transformatius de la UAB
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Mechanical antenna ; NIR nanoantenna ; Plasmonic nanoantenna ; Optomechanical transduction ; MEMS/NEMS resonators
Published in:	Sensors and Actuators A: Physical, Vol. 403 (June 2026) , art. 117714, ISSN 0924-4247

DOI: 10.1016/j.sna.2026.117714

8 p, 1.5 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles