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Papers by E. Randone

Research paper thumbnail of On the Optical Concentration Achievable by a Non-imaging Microprism Array Combined to an Image Photodetector

Research paper thumbnail of Dispositivo per la ripresa di immagini 3D basato su tecnologiaCMOS 180nm e telemetria a modulazione sinusoidale

Research paper thumbnail of Dipt. di Ing. Ind. e dell'Inf., Univ. di Pavia, Pavia, Italy

Research paper thumbnail of SPAD-array photoresponse is increased by a factor 35 by use of a microlens array concentrator

2009 IEEE LEOS Annual Meeting Conference Proceedings, 2009

Using an array of 32x32 plano-convex microlenses, fabricated by co-polymer casting in a photoresi... more Using an array of 32x32 plano-convex microlenses, fabricated by co-polymer casting in a photoresist replica mold, we have been able to increase the detection sensitivity of a SPAD (Single Photon Avalanche Detector) array of 32x32 pixels, 50-μm pitch, up to a factor of 35.

Research paper thumbnail of Uniformity of Concentration Factor and Back Focal Length in Molded Polymer Microlens Arrays

Conference on Lasers and Electro-Optics 2010, 2010

Abstract - An array of polymer microlenses, made of 32x32 individual elements spaced by a 50-μm p... more Abstract - An array of polymer microlenses, made of 32x32 individual elements spaced by a 50-μm pitch, is used in connection to an array of 32x32 6-μm diameter SPADs (Single Photon Avalanche Detector), with the aim of mitigating the loss in sensitivity due to the area ...

Research paper thumbnail of Improving Photodetector Performance by Means of Microoptics Concentrators

Journal of Lightwave Technology, 2000

We discuss the benefits of using microoptics concentration arrays in connection with image (or pi... more We discuss the benefits of using microoptics concentration arrays in connection with image (or pixellated) photodetectors, in terms of: 1) recovery of area fill-factor; 2) reduction of equivalent dark-current; 3) mitigate dead-time issues; and 4) improved dynamic range. As an example of application, we describe the fill-factor recovery in connection to an array of 32 32 6-m diameter, 50-m pitch, single photon avalanche detector (SPAD). We use a 32 32 array of microlenses, fabricated by polymer casting in a photoresist replica mold. We demonstrate, for the first time to the best of our knowledge, an increase by a factor 25 of the effective spectral sensitivity of the final device. The lens array itself allows a 35 recovery, and projected improvements in excess of 50 appear feasible.

Research paper thumbnail of Uniformity of Concentration Factor and BFL in Microlens Array for Image Detectors Applications

We use an array of polymer microlenses spatially matched to an array of SPADs (Single Photon Aval... more We use an array of polymer microlenses spatially matched to an array of SPADs (Single Photon Avalanche Detector) to mitigate the loss of sensitivity due to the area fill-factor. The lens array is fabricated by polymer casting in a photoresist replica mold. We report results about reproducibility of concentration factor and back focal length within an individual 32x32 array. At a C factor of 35 and a focal length F=40 µm, the spread of concentration is < 6%, and the spread of BFL is <0.5 µm.

Research paper thumbnail of On the Optical Concentration Achievable by a Non-imaging Microprism Array Combined to an Image Photodetector

Research paper thumbnail of Dispositivo per la ripresa di immagini 3D basato su tecnologiaCMOS 180nm e telemetria a modulazione sinusoidale

Research paper thumbnail of Dipt. di Ing. Ind. e dell'Inf., Univ. di Pavia, Pavia, Italy

Research paper thumbnail of SPAD-array photoresponse is increased by a factor 35 by use of a microlens array concentrator

2009 IEEE LEOS Annual Meeting Conference Proceedings, 2009

Using an array of 32x32 plano-convex microlenses, fabricated by co-polymer casting in a photoresi... more Using an array of 32x32 plano-convex microlenses, fabricated by co-polymer casting in a photoresist replica mold, we have been able to increase the detection sensitivity of a SPAD (Single Photon Avalanche Detector) array of 32x32 pixels, 50-μm pitch, up to a factor of 35.

Research paper thumbnail of Uniformity of Concentration Factor and Back Focal Length in Molded Polymer Microlens Arrays

Conference on Lasers and Electro-Optics 2010, 2010

Abstract - An array of polymer microlenses, made of 32x32 individual elements spaced by a 50-μm p... more Abstract - An array of polymer microlenses, made of 32x32 individual elements spaced by a 50-μm pitch, is used in connection to an array of 32x32 6-μm diameter SPADs (Single Photon Avalanche Detector), with the aim of mitigating the loss in sensitivity due to the area ...

Research paper thumbnail of Improving Photodetector Performance by Means of Microoptics Concentrators

Journal of Lightwave Technology, 2000

We discuss the benefits of using microoptics concentration arrays in connection with image (or pi... more We discuss the benefits of using microoptics concentration arrays in connection with image (or pixellated) photodetectors, in terms of: 1) recovery of area fill-factor; 2) reduction of equivalent dark-current; 3) mitigate dead-time issues; and 4) improved dynamic range. As an example of application, we describe the fill-factor recovery in connection to an array of 32 32 6-m diameter, 50-m pitch, single photon avalanche detector (SPAD). We use a 32 32 array of microlenses, fabricated by polymer casting in a photoresist replica mold. We demonstrate, for the first time to the best of our knowledge, an increase by a factor 25 of the effective spectral sensitivity of the final device. The lens array itself allows a 35 recovery, and projected improvements in excess of 50 appear feasible.

Research paper thumbnail of Uniformity of Concentration Factor and BFL in Microlens Array for Image Detectors Applications

We use an array of polymer microlenses spatially matched to an array of SPADs (Single Photon Aval... more We use an array of polymer microlenses spatially matched to an array of SPADs (Single Photon Avalanche Detector) to mitigate the loss of sensitivity due to the area fill-factor. The lens array is fabricated by polymer casting in a photoresist replica mold. We report results about reproducibility of concentration factor and back focal length within an individual 32x32 array. At a C factor of 35 and a focal length F=40 µm, the spread of concentration is < 6%, and the spread of BFL is <0.5 µm.

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