Alq(3) coated silicon nanomembranes for cavity optomechanics
Authors: Fogliano F., Ortu A., Camposeo A., Pisignano D., Ciampini D., Fuso F., Arimondo E.
Autors Affiliation: Univ Pisa, Dipartimento Fis E Fermi, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy; Euromediterranean Ctr Nanomat Modelling & Technol, Ist Nanosci CNR, Via Arnesano, I-73100 Lecce, Italy; Univ Salento, Dipartimento Matemat & Fis Ennio De Giorgi, Via Arnesano, I-73100 Lecce, Italy; INO CNR, Via G Moruzzi 1, I-56124 Pisa, Italy
Abstract: The optomechanical properties of a silicon-nitride membrane mirror covered by Alga and Silver layers are investigated. Excitation at two laser wavelengths, 780 and 405 nm, corresponding to different absorptions of the multilayer, is examined. Such dual driving will lead to a more flexible optomechanical operation. Topographic reconstruction of the whole static membrane deformation and cooling of the membrane oscillations are reported. The cooling, observed for blue laser detuning and produced by bolometric forces, is deduced from the optomechanical damping of the membrane eigenfrequency. We detemine the presence of different contributions to the photothermal response of the membrane.
KeyWords: Cavity optomechanics; photothermal forces; multilayer medium