R
R.D. Younger
Researcher at Massachusetts Institute of Technology
Publications - 20
Citations - 734
R.D. Younger is an academic researcher from Massachusetts Institute of Technology. The author has contributed to research in topics: Avalanche photodiode & Bandwidth (signal processing). The author has an hindex of 10, co-authored 20 publications receiving 687 citations. Previous affiliations of R.D. Younger include Boston University.
Papers
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Journal ArticleDOI
Optically sampled analog-to-digital converters
Paul W. Juodawlkis,J.C. Twichell,Gary E. Betts,J.J. Hargreaves,R.D. Younger,J.L. Wasserman,Frederick J. O'Donnell,K.G. Ray,R.C. Williamson +8 more
TL;DR: In this article, the authors present a phase-encoded optical sampling technique for analog-to-digital (ADC) converters with high-extinction LiNbO/sub 3/1/to-8 optical time-division demultiplexers.
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Optical down-sampling of wide-band microwave signals
TL;DR: In this article, a 60-MS/s phase-encoded optical sampling (PES) system was used to down-sample two different FM chirp signals: 1) a baseband (0-250 MHz) linear-chirp waveform and 2) a nonlinear-chircp waveforms having a 10-GHz center frequency and a frequency excursion of 1 GHz.
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Afterpulsing in Geiger-mode avalanche photodiodes for 1.06μm wavelength
Katharine Jensen,P.I. Hopman,E.K. Duerr,Eric A. Dauler,Joseph P. Donnelly,Steven H. Groves,L.J. Mahoney,K. A. McIntosh,K.M. Molvar,A. Napoleone,Douglas C. Oakley,Simon Verghese,Christopher J. Vineis,R.D. Younger +13 more
TL;DR: In this article, the authors considered the afterpulsing in avalanche photodiodes (APDs) operating in gated and free-running Geiger mode and obtained a dominant trap lifetime of τd=0.32μs, a trap energy of 0.11eV, and a baseline dark count rate 245kHz.
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Large-Format Geiger-Mode Avalanche Photodiode Arrays and Readout Circuits
Brian F. Aull,E.K. Duerr,Jonathan Frechette,K. Alexander McIntosh,Daniel R. Schuette,R.D. Younger +5 more
TL;DR: This paper reviews the development of arrays of custom-fabricated silicon and InP Geiger-mode avalanche photodiode arrays, CMOS readout circuits to digitally count or time stamp single-photon detection events, and discusses key technical challenges to scaling to large format.
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A case study for optics: The solid immersion microscope
A. Nickolas Vamivakas,A. Nickolas Vamivakas,R.D. Younger,R.D. Younger,Bennett B. Goldberg,Anna K. Swan,M. Selim Ünlü,Ernest R. Behringer,Ernest R. Behringer,S.B. Ippolito +9 more
TL;DR: In this article, the angular spectrum representation is used to calculate the focal fields produced by a conventional and a solid immersion microscope and a simple model for lens aberration is proposed to compare the performance of conventional and solid immersion microscopes.