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Thermal Noise in Optical Coatings: A Rigorous Opto-Mechanical Comparison of Nanolaminates and Isotropic Mixtures
Vincenzo Pierro, Vincenzo Fiumara, Veronica Granata +1
We investigate whether a perfectly ordered periodic nanolaminate is intrinsically less mechanically dissipative than an isotropic co-sputtered mixture designed to provide the exact…
Thermal Noise Reduction in Ternary Optical Coatings: From Ti::GeO-Based Ternary Systems to High Index Materials
Vincenzo Pierro, Guerino Avallone, Jessica Steinlechner +11
Minimizing coating thermal noise is crucial for enhancing gravitational wave detector sensitivity, with a target Amplitude Spectral Density Reduction Factor (ASD RF) of relat…
Experimental Realization of Optimized Ternary Mirror Coatings
V. Pierro, M. Granata, C. Michel +9
We report on the first experimental realization of multi-material dielectric mirror coatings designed through a multi-objective optimization algorithm to simultaneously minimize th…
Ternary Quarter Wavelength Coatings for Gravitational Wave Detector Mirrors: Design Optimization via Exhaustive Search
V. Pierro, V. Fiumara, F. Chiadini +9
Multimaterial optical coatings are a promising viable option to meet the challenging requirements (in terms of transmittance, absorbance and thermal noise) of next generation gravi…
Quantum correlation measurements in interferometric gravitational wave detectors
D. V. Martynov, V. V. Frolov, S. Kandhasamy +199
Quantum fluctuations in the phase and amplitude quadratures of light set limitations on the sensitivity of modern optical instruments. The sensitivity of the interferometric gravit…
Fabry -Perot filters with Tunable Josephson Junction Defects
Vincenzo Pierro, Giovanni Filatrella
We propose to take advantage of the properties of long Josephson junctions to realize a frequency variable Fabry-Perot Filter that operates in the range 100-500 GHz with a bandwidt…
Material loss angles from direct measurements of broadband thermal noise
Maria Principe, Innocenzo M. Pinto, Vincenzo Pierro +8
We estimate the loss angles of the materials currently used in the highly reflective test-mass coatings of interferometric detectors of gravitational waves, namely Silica, Tantala,…
Noise Estimate of Pendular Fabry-Perot through Reflectivity Change
Paolo Addesso, Vincenzo Pierro, Giovanni Filatrella
A key issue in developing pendular Fabry-Perot interferometers as very accurate displacement measurement devices, is the noise level. The Fabry-Perot pendulums are the most promisi…
Escape Time of Josephson Junctions for Signal Detection
P. Addesso, G. Filatrella, V. Pierro
In this Chapter we investigate with the methods of signal detection the response of a Josephson junction to a perturbation to decide if the perturbation contains a coherent oscilla…
Evidence of local effects in anomalous refraction and focusing properties of dodecagonal photonic quasicrystals
Emiliano Di Gennaro, Carlo Miletto, Salvatore Savo +5
We present the key results from a comprehensive study of the refraction and focusing properties of a two-dimensional dodecagonal photonic ``quasicrystal'' (PQC), carried out via bo…
A parametric study of the lensing properties of dodecagonal photonic quasicrystals
E. Di Gennaro, D. Morello, C. Miletto +5
We present a study of the lensing properties of two-dimensional (2-D) photonic quasicrystal (PQC) slabs made of dielectric cylinders arranged according to a 12-fold-symmetric squar…
Directive Emission from Defect-Free Dodecagonal Photonic Quasicrystals: A Leaky-Wave Characterization
Alessandro Micco, Vincenzo Galdi, Filippo Capolino +4
In this paper, we study the radiation from embedded sources in two-dimensional finite-size "photonic-quasicrystal" (PQC) slabs made of dielectric rods arranged according to a 12-fo…
Radiation Properties of One-Dimensional Quasirandom Antenna Arrays Based on Rudin-Shapiro Sequences
Vincenzo Galdi, Vincenzo Pierro, Giuseppe Castaldi +2
The development of exotic new materials, such as metamaterials, has created strong interest within the electromagnetics (EM) community for possible new phenomenologies and device a…
Parameterizing Quasiperiodicity: Generalized Poisson Summation and Its Application to Modified-Fibonacci Antenna Arrays
Vincenzo Galdi, Giuseppe Castaldi, Vincenzo Pierro +2
The fairly recent discovery of "quasicrystals", whose X-ray diffraction patterns reveal certain peculiar features which do not conform with spatial periodicity, has motivated studi…