A5060507047- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Advanced Fiber Optic Sensors
- Mechanical and Optical Resonators
- Optical Network Technologies
- Photonic Crystal and Fiber Optics
- Semiconductor Lasers and Optical Devices
- Advanced MEMS and NEMS Technologies
- Force Microscopy Techniques and Applications
- Nonlinear Dynamics and Pattern Formation
- Nonlinear Optical Materials Studies
- Advanced Photonic Communication Systems
Universitat de València
2014-2022
Centro Médico Sanitas Valencia
2020
The elasto-optic effect in optical fibers under axial strain can be characterized by means of the whispering gallery mode (WGM) resonances fiber itself. This technique enables a direct measurement anisotropy, determination individual Pockels' coefficients, and study wavelength dependence. method is based on rigorous theoretical WGM cylindrical microresonators. shift as function was measured for TE TM modes, showing strong modal anisotropy. In particular, rate modes 1.84 times one modes. From...
ABSTRACT Whispering gallery mode microresonators have been triggering considerable advances in science due to their ability confine light within small dielectric volumes, which makes them suitable for a wide range of applications. Lithographic approaches the dominant technique fabricating microresonators; however, they restrict choice materials multistep processing nature. As an alternative, report direct laser fabrication acrylic based hollow microcylinder resonators, via two‐photon...
Abstract We report on the experimental and theoretical analysis of parametrical optomechanical oscillations in hollow spherical phoxonic whispering gallery mode resonators due to radiation pressure. The optically excited acoustic eigenmodes cavity oscillate regeneratively leading parametric oscillation instabilities.
This Letter reports on the fabrication of long period fiber gratings having subnanometric bandwidths in 1500 nm spectral region. Large have been photo inscribed a high NA fiber; grating pitch and order HE cladding mode are optimized to produce with large number periods prevent coupling TE, TM, or EH modes. Resonances FWHM 0.83 0.68 achieved for 15 20 cm long, respectively; free range between transmission notches is 125 nm. The polarization effects sensitivity temperature strain variations...
UV-assisted fabrication of gratings using photosensitive fibers is a well-established technique, based on the UV-induced permanent modification refractive index fiber material. As result, absorption coefficient also changed. Here, we exploit thermal sensitivity whispering gallery mode resonances itself to measure profile heating along an irradiated versus input power and for different UV radiation intensities. Our technique allows discriminating between scattering contributions overall...
The physical mechanisms behind a mode cleaning effect observed in graphene oxide (GO)-doped polymeric microresonators are uncovered.
Optical fiber characterization using whispering gallery mode resonances of the itself has been demonstrated to be a powerful technique. In this work, we exploit thermal sensitivity characterize pump-induced temperature increment in holmium doped and holmium-ytterbium codoped optical fibers. The technique relies on measurement resonances’ wavelength shift due variation as function pump power. Holmium fibers were pumped second excited level 5I6 Ho3+ ion laser diode at 1125 nm ytterbium-holmium...
The strain-optic coefficients of PMMA are measured in a broad wavelength range from 800 to 2000 nm. sensitivity the azimuthal whispering gallery mode resonances strain is exploited measure micro-rods. technique based on measuring shift both polarizations states, TE and TM, when an axial applied polymer rods. This method enables determination material range. In particular, near-infrared range, exhibits negligible dispersion anisotropy, show constant values within experimental error: p 11 =...
We present a perturbative approximation to calculate the relative shift of WGM resonances in conventional optical fibers when an axial strain is applied. consider anisotropic character elasto-optic effect.
We were able to excite the whispering gallery mode of microresonators fabricated by two-photon polymerization. The resonators we have are 45 µm outer diameter hollow microcylinders with sidewall roughness approximately 100 nm. finesse such was estimated in 4.35, being at same order previously reported for high performance polymeric microrings resonators. By improving fabrication system been reduce microstructures roughness, which is major factor loss structures. These can be functionalized...
Experimental characterization of the refractive index anisotropy generated by elasto-optic effect in a conventional optical fiber under axial strain using WGMs resonances and their tunability with strain.
Summary form only given. When a photosensitive (PS) fiber is exposed to UV-irradiation, permanent refractive index change induced in the core. As result, according Kramers-Kronig relations, absorption coefficient (α) also increased. This increment of can lead significant heating when it illuminated by moderate optical power. Thermal effects may produce spectral changes some devices, as for example Long Period Gratings (LPGs) or Fiber Bragg (FBGs) [1]. In this paper, order measure temperature...
We present a technique to measure the absorption coefficient increment induced during UV-inscription of gratings in photosensitive fibers. Our also allows discriminating between and scattering contributions overall losses.
Whispering gallery mode resonators (WGMR) have attracted a great interest in the last decade. WGMR been fabricated different geometries, solid and hollow, spherical, toroidal, bottled shaped. Hollow spherical or microbubble (MBR) are arrived family of resonators. The approach used for their fabrication is based on surface tension driven plastic deformation pressurized capillary, similar to glassblowing. Using such technique we able fabricate large area thin shells with high quality factor...
We report on the experimental and theoretical analysis of parametrical optomechanical oscillations in hollow spherical PhoXonic whispering gallery mode resonators due to radiation pressure. The optically excited acoustic eigenmodes cavity oscillate regeneratively leading parametric oscillation instabilities.
Fiber whispering gallery modes (WGMs) are surface waves that propagate azimuthally along the outer of fiber cladding. Those in phase every turn give rise to narrow resonances defined by resonant wavelength and a high Q factor. The actual values wavelengths depend on radius refractive index cladding, enabling development several characterization techniques. In addition, typical factor these (Q > 106) provides techniques with low detection limit. Here, we report technique for measuring...
We report on the experimental analysis of parametrical optomechanical oscillations and photo-acoustical applications such as flow cytometers in hollow phoxonic whispering gallery mode resonators. Both phenomena can be enchanced or suppressed showed chaotic behavior.