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| 1 | Strongly enhanced light trapping in a two-dimensional silicon nanowire random fractal array显示文摘We report on the unconventional optical properties exhibited by a two-dimensional array of thin Si nanowires arranged in a random fractal geometry and fabricated using an inexpensive,fast and maskless process compatible with Si technology.The structure allows for a high light-trapping efficiency across the entire visible range,attaining total reflectance values as low as 0.1%when the wavelength in the medium matches the length scale of maximum heterogeneity in the system.We show that the random fractal structure of our nanowire array is responsible for a strong in-plane multiple scattering,which is related to the material refractive index fluctuations and leads to a greatly enhanced Raman scattering and a bright photoluminescence.These strong emissions are correlated on all length scales according to the refractive index fluctuations.The relevance and the perspectives of the reported results are discussed as promising for Si-based photovoltaic and photonic applications. | Barbara Fazio Pietro Artoni Maria Antonia Iatì Cristiano D’Andrea Maria JosèLo Faro Salvatore Del Sorbo Stefano Pirotta Pietro Giuseppe Gucciardi Paolo Musumeci Cirino Salvatore Vasi Rosalba Saija Matteo Galli Francesco Priolo Alessia Irrera | 2016 | Light(Science & Applications)2016，5，1： | 4 |
| 2 | Integrated sources of photon quantum states based on nonlinear optics显示文摘The ability to generate complex optical photon states involving entanglement between multiple optical modes is not only critical to advancing our understanding of quantum mechanics but will play a key role in generating many applications in quantum technologies.These include quantum communications,computation,imaging,microscopy and many other novel technologies that are constantly being proposed.However,approaches to generating parallel multiple,customisable bi-and multi-entangled quantum bits(qubits)on a chip are still in the early stages of development.Here,we review recent advances in the realisation of integrated sources of photonic quantum states,focusing on approaches based on nonlinear optics that are compatible with contemporary optical fibre telecommunications and quantum memory platforms as well as with chip-scale semiconductor technology.These new and exciting platforms hold the promise of compact,low-cost,scalable and practical implementations of sources for the generation and manipulation of complex quantum optical states on a chip,which will play a major role in bringing quantum technologies out of the laboratory and into the real world. | Lucia Caspani Chunle Xiong Benjamin J Eggleton Daniele Bajoni Marco Liscidini Matteo Galli Roberto Morandotti David J Moss | 2017 | Light(Science & Applications)2017，6，1： | 3 |
| 3 | Higher volume growth rate is associated with development of worrisome features in patients with branch duct-intraductal papillary mucinous neoplasms显示文摘BACKGROUND Branch duct-intraductal papillary mucinous neoplasms(BD-IPMNs)are the most common pancreatic cystic tumours and have a low risk of malignant transformation.Current guidelines only evaluate cyst diameter as an important risk factor but it is not always easy to measure,especially when comparing different methods.On the other side,cyst volume is a new parameter with low interobserver variability and is highly reproducible over time.AIM To assess both diameter and volume growth rate of BD-IPMNs and evaluate their correlation with the development of malignant characteristics.METHODS Computed tomography scans and magnetic resonance imaging exams were retrospectively reviewed.The diameter was measured on three planes,while the volume was calculated by segmentation:The volume of the entire cyst was determined by manually drawing a region of interest along the edge of the neoplasm on each consecutive slice covering the whole lesion;therefore,a threedimensional volume of interest was finally obtained with the calculated value expressed in cm^(3).Changes in size over time were measured.The development of worrisome features was evaluated.RESULTS We evaluated exams of 98 patients across a 40.5-mo median follow-up time.Ten patients developed worrisome features.Cysts at baseline were significantly larger in patients who developed worrisome features(diameters P=0.0035,P=0.00652,P=0.00424;volume P=0.00222).Volume growth rate was significantly higher in patients who developed worrisome features(1.12 cm^(3)/year vs 0 cm^(3)/year,P=0.0001);diameter growth rate was higher as well,but the difference did not always reach statistical significance.Volume but not diameter growth rate in the first year of follow-up was higher in patients who developed worrisome features(0.46 cm^(3)/year vs 0 cm^(3)/year,P=0.00634).CONCLUSION The measurement of baseline volume and its variation over time is a reliable tool for the follow-up of BD-IPMNs.Volume measurement could be a better tool than diameter measurement to predict the development of worrisome features. | Tommaso Innocenti Ginevra Danti Erica Nicola Lynch Gabriele Dragoni Matteo Gottin Filippo Fedeli Daniele Palatresi Maria Rosa Biagini Stefano Milani Vittorio Miele Andrea Galli | 2022 | World Journal of Clinical Cases2022，10，17： | 0 |
| 4 | Thermo-optically induced transparency on a photonic chip显示文摘Controlling the optical response of a medium through suitably tuned coherent electromagnetic fields is highly relevant in a number of potential applications,from all-optical modulators to optical storage devices.In particular,electromagnetically induced transparency(EIT)is an established phenomenon in which destructive quantum interference creates a transparency window over a narrow spectral range around an absorption line,which,in turn,allows to slow and ultimately stop light due to the anomalous refractive index dispersion.Here we report on the observation of a new form of both induced transparency and amplification of a weak probe beam in a strongly driven silicon photonic crystal resonator at room temperature.The effect is based on the oscillating temperature field induced in a nonlinear optical cavity,and it reproduces many of the key features of EIT while being independent of either atomic or mechanical resonances.Such thermo-optically induced transparency will allow a versatile implementation of EIT-analogs in an integrated photonic platform,at almost arbitrary wavelength of interest,room temperature and in a practical,low cost,and scalable system. | Marco Clementi Simone Iadanza Sebastian A.Schulz Giulia Urbinati Dario Gerace Liam O’Faloain Matteo Galli | 2021 | Light(Science & Applications)2021，10，12： | 0 |
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