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Berneschi S Farnesi D Cosi F Conti GN Pelli S Righini GC Soria S 《Optics letters》2011,36(17):3521-3523
Microbubble resonators combine the unique properties of whispering gallery mode resonators with the intrinsic capability of integrated microfluidics. Here an improved fabrication method of microbubble resonators is presented, based on the heating of a slightly pressurized capillary by a rotating arc discharge. Rotation of the electrodes, moved out of a fiber splicer, ensures a homogeneous distribution of the heat all over the capillary surface. The demonstrated microbubble resonators have Q factors up to 6×10(7) at 1550?nm. Microbubbles were filled with water and aqueous solutions of ethanol in order to test the refractive index sensing capabilities of such resonators, which also show a good temporal stability. The limit of detection of our microbubble resonator sensor is 10(-6)?RIU. 相似文献
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Whispering-gallery-mode (WGM) microresonators are used as optical transducers for sensing applications. The typical detection scheme is based on tracking the WGM resonance shift, by scanning with a tunable laser, when a change of the refractive index in the region probed by the WGM takes place. We propose a sensing approach based instead on monitoring the position of the laser line of a fiber ring laser having a WGM microsphere in its loop. We have demonstrated that the induced shift is the same for the ring laser line and for the microsphere resonance. The proposed method requires simpler, cheaper equipment and may also improve the sensor resolution because the ring laser line is much narrower than the microsphere WGM resonance. 相似文献
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G.C. Righini S. Berneschi G. Nunzi Conti S. Pelli E. Moser R. Retoux P. Fron R.R. Gonalves G. Speranza Y. Jestin M. Ferrari A. Chiasera A. Chiappini C. Armellini 《Journal of Non》2009,355(37-42):1853-1860
In this paper we present some result on sol–gel derived silica–hafnia systems. In particular we focus on fabrication, morphological and spectroscopic assessment of Er3+-activated thin films. Two examples of silica–hafnia-derived waveguiding glass ceramics, prepared by top–down and bottom–up techniques are reported, and the main optical properties are discussed. Finally, some properties of activated microspherical resonators, having a silica core, obtained by melting the end of a telecom fiber, coated with an Er3+-doped 70SiO2–30HfO2 film, are presented. 相似文献
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Chiappini Andrea Chiasera Alessandro Berneschi Simone Armellini Cristina Carpentiero Alessandro Mazzola Maurizio Moser Enrico Varas Stefano Righini Giancarlo C. Ferrari Maurizio 《Journal of Sol-Gel Science and Technology》2011,60(3):408-425
Sol–gel is a handy, very flexible, and cheap method to fabricate, study, and apply innovative photonic structures. The possibility
of starting from molecular precursors and elementary building blocks permits to tailor structures at the molecular level and
to create new materials with enhanced performances. Of specific interest for the study of important physical effects as well
as for application in light management are confined structures on the nano-micro scale as photonic crystal and planar waveguides.
Activation by luminescent species and in particular by rare earth ions allows results in the integrated optics area covering
application in sensing, biomedical diagnostic, telecommunication, lightning, and photon management. The present review is
focused on some recent results obtained by the authors in Sol–gel photonics. The first part presents colloidal structures
including single nano-micro spheres and photonic crystal structures. The second part of the review deals with amorphous and
transparent glass–ceramic employed for the fabrication of confined structures in planar format. Some specific application
are also reported to highlight the role of sol gel photonics in the development of high performance optical sensors, waveguide
lasers, and nanostructured materials. 相似文献
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