Dr. Giancarlo C. Righini
CNR - IFAC, Sesto Fiorentino, Italy
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Academic Career Length
54Years (1973-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications23 April 2010 in Laser & Photonics Reviews
Journal Article
AAlessandro Chiasera
Alessandro Chiasera YDY. Dumeige
Y. Dumeige
PFP. Féron
P. Féron
Maurizio FerrariYJY. Jestin
Y. JestinGiancarlo C. Righini +3
Journal Article
Giancarlo C. Righini
Silvia Soria HuguetWhispering gallery mode (WGM) microresonators, thanks to their unique properties, have allowed researchers to achieve important results in both fundamental research and engineering applications. Among the various geometries, microspheres are the simplest 3D WGM resonators; the total optical loss in such resonators can be extremely low, and the resulting extraordinarily high Q values of 108–109 lead to high energy density, narrow resonant-wavelength lines and a lengthy cavity ringdown. They can also be coated in order to better control their properties or to increase their functionality. Their very high sensitivity to changes in the surrounding medium has been exploited for several sensing applications: protein adsorption, trace gas detection, impurity detection in liquids, structural health monitoring of composite materials, detection of electric fields, pressure sensing, and so on. In the present paper, after a general introduction to WGM resonators, attention is focused on spherical microresonators, either in bulk or in bubble format, to their fabrication, characterization and functionalization. The state of the art in the area of biosensing is presented, and the perspectives of further developments are discussed.
15 April 1996 in Physical Review B
Journal Article
Gaetano Scamarcio
Vincenzo SpagnoloGVGennaro Ventruti
Gennaro VentrutiMLM. Lugará
M. Lugará
Giancarlo C. RighiniAn increase in the Fröhlich-electron-LO-phonon interaction strength with decreasing nanocrystal size in the strong confinement limited is reported. This results from the size dependence of resonant Raman scattering by nanocrystals embedded in a glass slab. The mean particle radius Å increases monotonically with the position along the slab so that, for each laser line, the resonance has been tuned by scanning the sample with a microprobe. The relative strength between Fröhlich and deformation-potential contributions is determined by analyzing the polarization properties of the scattering.
3 February 2023 in Progress in Materials Science
Journal Article
WBWilfried Blanc
Wilfried Blanc
YCYong Gyu Choi
Yong Gyu Choi
XZXianghua Zhang
Xianghua Zhang
Marcelo NalinKRKathleen A. Richardson
Kathleen A. Richardson
LPLaeticia Petit
Laeticia Petit
+6
1 September 2011 in Optics Letters
Journal Article
Simone BerneschiDFD. Farnesi
D. Farnesi
FCF. Cosi
F. Cosi
GCGualtiero Nunzi Conti
Gualtiero Nunzi Conti
Stefano PelliSilvia Soria Huguet +1
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 at . 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 .
Journal Article
Silvia Soria HuguetSimone BerneschiMBMassimo Brenci
Massimo BrenciFCFranco Cosi
Franco CosiGCGualtiero Nunzi Conti
Gualtiero Nunzi ContiGiancarlo C. Righini +1
Optical resonators play an ubiquitous role in modern optics. A particular class of optical resonators is constituted by spherical dielectric structures, where optical rays are total internal reflected. Due to minimal reflection losses and to potentially very low material absorption, these guided modes, known as whispering gallery modes, can confer the resonator an exceptionally high quality factor Q, leading to high energy density, narrow resonant-wavelength lines and a lengthy cavity ringdown. These attractive characteristics make these miniaturized optical resonators especially suited as laser cavities and resonant filters, but also as very sensitive sensors. First, a brief analysis is presented of the characteristics of microspherical resonators, of their fabrication methods, and of the light coupling techniques. Then, we attempt to overview some of the recent advances in the development of microspherical biosensors, underlining a number of important applications in the biomedical field.
About Me
Dr. Giancarlo C. Righini is a Senior Associate at Nello Carrara Institute of Applied Physics, National Research Council of Italy (IFAC CNR). Physicist, fellow of EOS, Optica, SIOF, SPIE, and meritorious member of the Italian Physical Society (SIF), he worked almost 40 years at CNR, in Florence, and in Rome, where he was the director of various scientific committees. After his retirement from CNR, he was director of the Enrico Fermi Centre in Rome, a public institution dealing with research in physics and the history of physics. He is the author or co-author of over 600 papers, mostly on photonic glasses, integrated optics, microresonators, and cosmic rays’ detection (ORCID ID: 0000-0002-6081-6971). He has been a co-editor of some books on photonics and an editor or guest editor of various journals; currently, he is editor-in-chief of Section D4 of Micromachines. He was co-founder and president of the Italian Society of Optics and Photonics (SIOF), vice president of the International Union of Pure and Applied Physics (IUPAP) and of the International Commission on Optics (ICO), secretary of the European Optical Society (EOS), and member of the Board of Directors of SPIE. He is honorary chair of the series of PRE (Photoluminescence in Rare Earths) biannial workshops. In 2021, he was awarded the Turner award of the International Commission on Glass. In 2024, SIOF presented him a career award.