Searched for: author:"Gerini, G."
(1 - 20 of 184)

Pages

document
Kenworthy, C.F. (author), Stoevelaar, L.P. (author), Alexander, A.J. (author), Gerini, G. (author)
In this paper, we report the effect of optical trapping on the enhancement factor for Raman spectroscopy, using a dielectric metasurface. It was found that a higher enhancement factor (up to 275%) can be obtained in a substrate immersed in water, where particles are freee to move, compared to a dried substrate, where the particles (radius r = 9...
article 2021
document
Buijs, R.D. (author), Wolterink, T.A.W. (author), Gerini, G. (author), Verhagen, E. (author), Koenderink, A.F. (author)
Control of optical fields at the nanoscale holds the promise of fast, efficient imaging methods, but is elusive due to the diffraction limit. This paper investigates how a single metasurface patch in the near field of a sample plane may be used to create a wide variety of intensity patterns by applying different illumination profiles from the...
article 2021
document
Wolterink, T.A.W. (author), Buijs, R.D. (author), Gerini, G. (author), Verhagen, E. (author), Koenderink, A.F. (author)
Overlay measurements are a critical part of modern semiconductor fabrication, but overlay targets have not scaled down in the way devices have. In this work, we produce overlay targets with very small footprint, consisting of just a few scattering nanoparticles in two separate device layers. Using moiré patterns to deterministically generate...
article 2021
document
Wolterink, T.A.W. (author), Buijs, R.D. (author), Gerini, G. (author), Koenderink, A.F. (author), Verhagen, E. (author)
We study how nanophotonic structures can be used for determining the position of a nearby nanoscale object with subwavelength accuracy. Through perturbing the near-field environment of a metasurface transducer consisting of nano-apertures in a metallic film, the location of the nanoscale object is transduced into the transducer’s far-field...
article 2021
document
Berzins, J. (author), Indrisiūnas, S. (author), van Erve, K. (author), Nagarajan, A. (author), Fasold, S. (author), Steinert, M. (author), Gerini, G. (author), Gecys, P. (author), Pertsch, T. (author), Bäumer, S.M.B. (author), Setzpfandt, F. (author)
article 2020
document
Nagarajan, A. (author), van Erve, K. (author), Gerini, G. (author)
A coupled dielectric-metal metasurface (CDMM) filter consisting of amorphous silicon (a-Si) rings and subwavelength holes in Au layer separated by a SiO2 layer is presented. The design parameters of the CDMM filter is numerically optimized to have a polarization independent peak transmittance of 0.55 at 1540 nm with a FullWidth at Half Maximum ...
article 2020
document
Gerini, G. (author), Stoevelaar, L.P. (author), Ceccotti, T. (author)
In this work, we present three different metamaterial based spectro-polarimetric systems. Their principles of operation and their performances are briefly discussed. A more detailed analysis of the three systems and the results of the experimental characterization of the first concept will be presented at the conference.
conference paper 2020
document
Ericsson, A. (author), Sjoberg, D. (author), Gerini, G. (author), Cappellin, C. (author), Jensen, F. (author), Balling, P. (author), Fonseca, N.J.G. (author), de Maagt, P. (author)
We present antenna system using a circular polarization selective surface (CPSS) to realize a circular polarization (CP) equivalent to the widely used linear polarization (LP) gridded or dual-gridded reflector (DGR). The CPSS is realized by a multilayer stack of nonresonant anisotropic meander line surfaces, achieving a very wide bandwidth. The...
article 2020
document
Gandini, E. (author), Silvestri, F. (author), Benini, A. (author), Gerini, G. (author), Martini, E. (author), Maci, S. (author), Vigano, M.C. (author), Toso, G. (author), Monni, S. (author)
The design and experimental validation of a wide scanning dome antenna with reduced profile is presented. The antenna is based on the combination of a planar phased array with limited scanning capabilities and a dielectric lens which allows to broaden the field of view. The angular variation of the scan loss can be almost arbitrarily designed if...
article 2020
document
Buijs, R.D. (author), Schilder, N.J. (author), Wolterink, T.A.W. (author), Gerini, G. (author), Verhagen, E. (author), Koenderink, A.F. (author)
Super-resolution imaging is often viewed in terms of engineering narrow point spread functions, but nanoscale optical metrology can be performed without real-space imaging altogether. In this paper, we investigate how partial knowledge of scattering nanostructures enables extraction of nanoscale spatial information from far-field radiation...
article 2020
document
Stoevelaar, L.P. (author), Berzins, J. (author), Silvestri, F. (author), Fasold, S. (author), Zangeneh Kamali, K. (author), Knopf, H. (author), Eilenberger, F. (author), Setzpfandt, F. (author), Pertsch, T. (author), Bäumer, S.M.B. (author), Gerini, G. (author)
We present a planar spectro-polarimeter based on Fabry-Pérot cavities with embedded polarization-sensitive high-index nanostructures. A 7 μm-thick spectro-polarimetric system for 3 spectral bands and 2 linear polarization states is experimentally demonstrated. Furthermore, an optimal design is theoretically proposed, estimating that a system...
article 2020
document
Buijs, R.D. (author), Schilder, N.J. (author), Wolterink, T.A.W. (author), Gerini, G. (author), Femius Koenderink, A. (author), Verhagen, E. (author)
We investigate how partial knowledge of scattering nanostructures enables extraction of spatial information from far-field radiation patterns. A reconstruction technique based on singular value decomposition allows localisation of a point-like light source with nanoscale resolution.
conference paper 2020
document
Huang, J. (author), Cao, Z. (author), Zhao, X. (author), Zhang, X. (author), Liu, Y. (author), Xiang, Y. (author), Gerini, G. (author), Koonen, A.M.J. (author)
In this article, a novel electrically controlled optical broadband phase shifter (ECO-BPS) is proposed and experimentally investigated for broadband microwave orbital angular momentum (OAM) mode generation. Based on the proposed ECO-BPS and a 17-element circular antenna array, the effect of the phase error on the OAM mode quality is studied by...
article 2020
document
Nagarajan, A. (author), Siemons, M. (author), Stoevelaar, L.P. (author), Silvestri, F. (author), Achanta, V.G. (author), Bäumer, S.M.B. (author), Gerini, G. (author)
In this paper, we discuss the setup of a confocal nanoscope in reflection using a super-oscillatory lens (SOL)which offers a sub-diffracted focal spot with an ultra-short depth of focus (≈100 nm). A tolerance of 20 nm defocussing in a 10 μm travel range is thus necessary, translating to an alignment requirement of the stage, with respect to the...
conference paper 2019
document
Stoevelaar, L.P. (author), Gerini, G. (author)
This contribution presents the design and performance assessment of a metasurface based spectro-polarimeter concept.
other 2019
document
Stoevelaar, L.P. (author), Cernigoj, J. (author), Berzinš, J. (author), Silvestri, F. (author), Gerini, G. (author)
In this paper, an all-dielectric metasurface for surface enhanced Raman spectroscopy (SERS) is presented. The proposed design constitutes of an array of silicon (Si) dimers on top of thin film of silicon nitride (SiN), deposited on a glass substrate. The coupling mechanism between the dimers is based on two orthogonal guided waves in the SiN...
conference paper 2019
document
Stoevelaar, L.P. (author), Gerini, G. (author)
TNO is currently performing a theoretical assessment of an optical system based on a Solid Immersion Lens (SIL). This contribution presents the theoretical approach and the modelling framework developed for this study.
other 2019
document
Ahopelto, J. (author), Benini, A. (author), Bilotti, F. (author), Casali, B. (author), Chazelas, J. (author), Gerini, G. (author), Hao, Y. (author), Herbertz, K. (author), Maci, S. (author), Massa, A. (author), Pierantoni, L. (author), Torres, C.M. Sotomayor (author), Treyakov, S. (author), Tripon-Canseliet, C. (author), Vardaxoglou, Y. (author), Vecchi, G. (author), Zayats, A. (author)
'Nanoarchitectronics' (NTX) denotes a new interdisciplinary research area at the crossroad of Electromagnetics and Nanoelectronics. This new technology will develope reconfigurable, adaptive and cognitive structures with unique physical properties, and engineering applications in the whole electromagnetic spectrum. This FET project funded by the...
conference paper 2019
document
Gandini, E. (author), Silvestri, F. (author), Benini, A. (author), Gerini, G. (author), Martini, E. (author), MacI, S. (author), Viganò, M.C. (author), Toso, G. (author), Monni, S. (author)
A wide scanning dome antenna with reduced profile is presented in this contribution. The minimum height of the dielectric lens is derived from its geometrical configuration and imposed in the design. The antenna is analysed using in-house ray tracing and physical optics tools. Because of the presence of the lens, the phase distribution of the...
conference paper 2019
document
Nagarajan, A. (author), Stoevelaar, L.P. (author), Silvestri, F. (author), Siemons, M. (author), Achanta, V.G. (author), Bäumer, S.M.B. (author), Gerini, G. (author)
A superoscillatory lens (SOL) is known to produce a sub-diffraction hotspot that is useful for high-resolution imaging. SOLs have not yet been directly used in a confocal reflection setup, as the SOL suffers from poor imaging properties. Additionally, the illuminating intensity distribution of the SOL still has high-intensity rings called...
article 2019
Searched for: author:"Gerini, G."
(1 - 20 of 184)

Pages