Person:
González Cano, Agustín

Profile Picture
First Name
Agustín
Last Name
González Cano
URI
https://hdl.handle.net/20.500.14352/79943
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Óptica y Optometría
Department
Óptica
Area
Optica
Identifiers
UCM identifierORCIDScopus Author IDDialnet ID

Filters

2016 - 201932020 - 20231
Reset filters

Settings

Start date: 2010 × Subject: 621.391.6 ×

Search Results

Now showing 1 - 4 of 4
  • Thumbnail Image
    Item
    Deposition of Graphene Oxide on an SPR Fiber Refractometer for Sensor Applications
    (Sensors, 2023) Navarrete Fernández, María Cruz; Díaz Herrera, Natalia; González Cano, Agustín
    Graphene-based materials have been increasingly incorporated to optical fiber plasmonic sensors due to the peculiar physical and chemical properties of these materials (hardness and flexibility, high electrical and thermal conductivity, and very good adsorption for many substances, etc.). In this paper, we theoretically and experimentally showed how the addition of graphene oxide (GO) to optical fiber refractometers permits the development of surface plasmon resonance (SPR) sensors with very good characteristics. We used doubly deposited uniform-waist tapered optical fibers (DLUWTs) as supporting structures because of their already proven good performance. The presence of GO as an effective third layer is useful to tune the wavelength of the resonances. In addition, the sensitivity was improved. We depict the procedures for the production of the devices and characterize the GO+DLUWTs produced in this way. We also showed how the experimental results are in agreement with the theoretical predictions and used these to estimate the thickness of deposited GO. Finally, we compared the performance of our sensors with other ones that have been recently reported, showing that our results are among the best reported. Using GO as the medium in contact with the analyte, in addition to the good overall performance of devices, permit consideration of this option as an interesting possibility for the future development of SPR-based fiber sensors.
  • Thumbnail Image
    Item
    Microfiber as light source for exciting fluorescence in a polymer optical fiber
    (Sensors and Actuators B - Chemical, 2016) Rodriguez Schwendtner, E.; Navarrete Fernández, María Cruz; Díaz Herrera, Natalia; Esteban Martínez, Óscar; González Cano, Agustín
    We present a new technique for exciting and collecting fluorescence with all-fiber devices, consisting of two different tapered fibers, a microfiber used as illuminating source and a polymer optical fiber where a fluorophore has been deposited and where the fluorescence takes place. We depict the fabrication of the device, characterize its performance and show the feasibility of our approach, the good performance obtained and the possibility of using the flexibility of the illuminating fiber to increase this performance and the compactness of the device.
  • Thumbnail Image
    Item
    Ellipsometric characterization of Bi and Al2O3 coatings for plasmon excitation in an optical fiber sensor
    (Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics, 2019) Rodriguez Schwendtner, Eva María; Álvarez Herrero, Alberto; Mariscal Jiménez, Antonio; Serna Galán, Rosalía; González Cano, Agustín; Navarrete Fernández, María Cruz; Díaz Herrera, Natalia
    The authors present the results of the ellipsometric characterization of thin layers of bismuth and aluminum oxide deposited over the waist of a tapered optical fiber by pulsed laser deposition. The characteristics of the deposits are studied by spectroscopic ellipsometry. From the effective thicknesses determined by the ellipsometric characterization, it is shown by simulations that surface plasmon resonances (SPRs) can occur in the fiber device, and it is demonstrated experimentally. These results show the feasibility of employing bismuth as a plasmonic material in SPR fiber sensors based on doubly-deposited uniform-waist tapered optical fibers, which show excellent performance and versatility.
  • Thumbnail Image
    Item
    Signal processing in SPR fiber sensors: Some remarks and a new method
    (Sensors and Actuators B: Chemical, 2018) Rodriguez Schwendtner, Eva María; González Cano, Agustín; Díaz Herrera, Natalia; Navarrete Fernández, María Cruz; Esteban Martínez, Óscar
    The importance of Surface Plasmon Resonance (SPR)-based devices in the field of chemical and biological sensing and the expectations created in terms of sensitivity and resolution impose the necessity of developing an adequate methodology for the processing of the signals obtained and for the evaluation of the performance of the sensing systems. We discuss in depth and clarify the problem of the analysis of data acquiring and processing in SPR fiber sensors, show how in many cases this analysis could and must be improved and propose a new method of SPR curve shaping, apt for sensors encapsulated or inaccesible. We illustrate the use of the method with real experimental examples.