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DTSTART;TZID=America/New_York:20241009T160000
DTEND;TZID=America/New_York:20241009T170000
DTSTAMP:20240919T165614Z
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SUMMARY:Photonics Initiative Seminar: Jonathan Pelliciari
DESCRIPTION:Co-sponsored with CCNY. \nUsing Resonant Inelastic X-Ray Scattering to study quantum materials \nAbstract – Modern light sources like the NSLS-II at Brookhaven National Lab deliver bright tunable photons in a wide range of energies from the THz regime up to 100 keV. This allowed the development of scattering techniques relying on the use of atomic resonances enabling the access to the electronic degrees of freedom in materials. Resonant Inelastic X-Ray Scattering (RIXS) is one of these techniques and thanks to the massive development in instrumentation and theory is playing a significant role in the study of quantum materials with contributions in multiple fields such as superconductivity\, quantum magnetism\, 2D materials\, and lately single photon emission. The sensitivity of RIXS to bosonic excitations of different nature (spin\, orbital\, lattice\, and charge) can provide microscopic information on materials as a function of energy and momentum. In my seminar I will start by introducing RIXS its capabilities and limitations\, followed by a description of the experimental components needed to perform high-resolution RIXS and the solution that we developed at BNL. I will then move forward by highlighting three scientific cases in different fields. The first will involve our investigations on superconducting infinite layer nickelates where we studied the evolution of the spin dynamics across the superconducting dome akin to past studies on the cuprates. The second case regards the study of quantum emitters in hBN where in collaboration with CUNY we could unveil vibronic states and connect them to the signals detected in photoluminescence possibly identifying N2 molecular vibrations as the key for the emergence of quantum emission. Finally\, I will conclude by highlighting one of our studies on excitons in 2D van der Waals magnets where we could detect their nature\, evolution as a function of charge transfer energy (and hybridization)\, and their dispersion in momentum space. \n[1] Ament et al.\, Rev. Mod. Phys. 83\, 705\n[2] Fan et al.\, unpublished\n[3] Pelliciari et al.\, Nat. Mat. 23\, 1230\n[4] Occhialini et al.\, Phys. Rev. X 14\, 031007 \nBio – Jonathan (Johnny) Pelliciari is an Associate Scientist at NSLS-II where he uses advanced scattering techniques (including Resonant Elastic and Inelastic X-Ray Scattering RIXS) to investigate the electronic properties of quantum materials. He got a Bachelor and Master degree in Chemistry at the University of Modena and Reggio Emilia (Italy) and a PhD in Experimental Condensed Matter Physics at the Paul Scherrer Institute and University of Fribourg/Freiburg (Switzerland). His research involves the study of electronic orders such charge and spin density waves and the elementary (spin\, charge\, orbital\, and lattice) excitations in superconductors\, low dimensional systems\, and materials displaying metal-to-insulator transitions. Overall\, his research interests span different physical phenomena such as ultrafast phenomena\, unconventional charge density waves\, spin excitations\, superconductivity\, 2D van der Waals systems\, spin liquids\, and quantum emitters. He developed a laser-RIXS setup commissioned at the SIX beamline to study quantum materials and their ultrafast transitions. \nHe has several active collaborations with external universities and research institutes (CUNY\, Stanford\, MIT\, Yale\, Harvard\, University of Zagreb\, and PSI) on different projects.
URL:https://asrc.gc.cuny.edu/event/photonics-initiative-seminar-jonathan-pelliciari/
LOCATION:CCNY Marshak room 418\, 160 Convent Avenue\, New York\, NY\, 10031\, United States
CATEGORIES:Photonics
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DTSTART;TZID=America/New_York:20241014T100000
DTEND;TZID=America/New_York:20241014T110000
DTSTAMP:20240831T192413Z
CREATED:20240821T152558Z
LAST-MODIFIED:20240831T192413Z
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SUMMARY:Photonics Initiative Seminar: Yakir Hadad
DESCRIPTION:Exact formulation of the mutual particle-cavity dynamics and its use for the study of loss threshold phenomenon under magnetization\nAbstract – Light-matter interaction plays a pivotal role in pushing forward nanotechnology. A particularly important setup involves a resonating particle\, say an emitting molecule or a macroscopic quasi-statically resonating plasmonic or ferromagnetic sphere\, that is located inside a cavity. \nIn this work\, we provide an analytic formulation for the exact calculation of the mutual dynamics between a resonant particle and a rectangular cavity in which it is located. The particle is assumed to be small on the wavelength\, and thus\, its excitation is dominated by a dipolar response that can be described using the discrete dipole approximation and polarizability theory.  The dipolar response depends on the particle’s polarizability function which encapsulates the particle’s materials and geometry\, and on the local field acting on the particle. In principle\, the latter is nothing more than the backscattering of the particle field by the cavity walls.  However\, its derivation may be challenging since it involves a three-dimensional singularity subtraction of the Green’s function in the cavity and the Green’s function in the free space that are differently represented. In this work\, we discuss the use of a recursive ladder-type process involving alternative Green’s function representations to calculate the local field in a computationally efficient and numerically stable manner. Using this approach\, we solve exactly several strongly coupled particle-cavity systems and calculate the collective resonance frequencies of the system. \nAs a particularly interesting example\, we focus on the case when the plasmonic particle is subject to a static magnetic field\,  . In this case\, its gyrotropic response gives rise to non-reciprocal dynamics of the ambient surroundings.  This dynamics depends on the particle’s excitation\, which in turn depends on the gyrotropic material damping rate  . Thus\, intuitively speaking\, the heavier the gyrotropic material loss is\, the weaker the non-reciprocal response will be. This is indeed the case when the particle is located in free space. However\, when the gyrotropic particle is placed inside a cavity\, we show that the non-reciprocity measure is robust against material loss up to a specific loss threshold\,  that depends on the magnetic biasing . \nBio – Dr. Yakir Hadad received the B.Sc. and M.Sc. degrees (summa cum laude) in electrical and computer engineering from the Ben Gurion University of the Negev\, Be’er Sheva\, Israel\, in 2006 and 2008\, respectively\, and the Ph.D. degree in physical electronics from Tel Aviv University\, Tel Aviv\, Israel\, in 2014.\,From 2015 to 2017\, he was a Post-Doctoral Fellow with the Department of Electrical and Computer Engineering\, The University of Texas at Austin\, Austin\, TX\, USA. During recent years\, he also spent several periods as a Visiting Scientist with the FOM Institute Atomic and Molecular Physics (AMOLF)\, Amsterdam\, The Netherlands\, in Fall 2015\, and the University of Pennsylvania\, Philadelphia\, PA\, USA\, in Spring 2013 and in Summer 2018. In 2017\, he joined the Department of Physical Electronics\, Faculty of Engineering\, Tel Aviv University\, where he is currently an Associate Professor. His research interest spreads on a wide range of wave modeling problems as well as on analytical and semi-analytical methods in electromagnetics and acoustics\, with a particular emphasize on wave phenomena in complex media with applications in overcoming bounds of wave theory\, Dr. Hadad received the Felsen Award for Excellence in Electrodynamics from the European Association for Antennas and Propagation in 2016\, the 2017 recipient of the prestigious Alon Fellowship for Outstanding Young Faculty from the Israeli Council of Higher Education\, Listed in Tel-Aviv University Rector’s list for excellence in teaching\, and won the 2020 Krill Prize for excellence in research by the Wolf Foundation. \nThis is an in-person seminar. If you opt to join via zoom use meeting ID 837 9843 9863 Passcode 700331
URL:https://asrc.gc.cuny.edu/event/photonics-initiative-fall-2024-seminar-series-yakir-hadad/
LOCATION:ASRC Auditorium\, 85 St. Nicholas Terrace\, New York\, NY\, 10031\, United States
CATEGORIES:Photonics
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DTSTART;TZID=America/New_York:20241021T100000
DTEND;TZID=America/New_York:20241021T120000
DTSTAMP:20241009T220559Z
CREATED:20240831T191933Z
LAST-MODIFIED:20241009T220559Z
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SUMMARY:Photonics Initiative Seminar: Giovanni Toso and Piero Angeletti
DESCRIPTION:Multi-Beam Antennas (MBAs) and Beam-Forming Networks (BFNs)\nAbstract – Distinguished Speakers Giovanni Toso and Piero Angeletti from European Space Agency\, Netherlands will present the state of the art and the on-going development in Multi-Beam Antennas (MBAs) and Beam-Forming Networks (BFNs). They find applications in several fields including communications\, remote sensing (e.g. radars\, radiometers\, etc.)\, electric surveillance and defense systems\, science (e.g. multibeam radio telescopes)\, RF navigation systems\, etc. They may be installed on board satellites\, airplanes\, trains\, buses\, cars etc. MBAs and BFNs are becoming also fundamental elements in emerging MIMO and 5G communications. The BFN plays an essential role in any antenna system relaying on a set of radiating elements to generate a beam. The lectures cover both theoretical and practical aspects for the following topics: \n\nOverview of systems applications\nMultibeam Antenna Architecture (based on Reflectors\, Arrays. Lenses)\nBeamforming Networks\n\nAnalogue BFNs (Corporate\, Blass\, Nolen\, Butler matrices\, Digital BFNs)\n\n\nOverview of some Operational Multibeam Antennas/BFNs\nOn-going European Developments\nCurrent Design and Technical Challenges\n\nBio – Giovanni Toso received the Laurea Degree (cum laude)\, the Ph.D. and the Post Doctoral Fellowship from the University of Florence\, Italy\, in 1992\, 1995 and 1999\, respectively. Since 2000\, he has been with the Antenna and Submillimeter Waves Section\, European Space Agency (ESA)\, European Space Research and Technology Centre (ESTEC)\, Noordwijk\, The Netherlands. He has been initiating several research and development activities on satellite antennas based on arrays\, reflectarrays\, discrete lenses\, and reflectors. Since 2010\, together with Dr. P. Angeletti\, he has been instructing short courses on Multibeam Antennas and Beamforming Networks during international conferences that have been attended by more than 1200 participants. He is the organizer of two EurAAP-ESoA Courses on Active Antennas and on Satellite Antennas. From January 2023 Giovanni Toso has been elevated to IEEE Fellow grade for contributions to multibeam antenna developments for satellite applications. G. Toso is a Distinguished Lecturer of the IEEE Antennas and Propagation Society and has coauthored about 20 ESA International Patents. \nPiero Angeletti (M’07) received the Laurea degree in electronics engineering from the University of Ancona\, Ancona\, Italy\, in 1996\, and the Ph.D. degree in electromagnetism from the University of Rome “La Sapienza\,” Rome\, Italy\, in 2010.\,His 15 years of experience in RF Systems engineering and technical management encompass conceptual/architectural design\, tradeoffs\, detailed design\, production\, integration\, and testing of satellite payloads and active antenna systems for commercial/military telecommunications and navigation (spanning all the operating bands and set of applications) as well as for multifunction RADARs and electronic counter measure systems. He is currently a Member of the Technical Staff with the European Space Research and Technology Centre (ESTEC)\, European Space Agency\, Noordwijk\, The Netherlands. He is with the RF Payload Systems Division\, ESA Technical and Quality Management Directorate\, which is responsible for RF space communication systems\, instrumentation\, subsystems\, equipment\, and technologies. In particular he oversees ESA R&D activities related to flexible satellite payloads\, RF front ends and on-board digital processors. He authored or coauthored over 150 technical reports\, book chapters\, and papers published in peer reviewed professional journals and international conference proceedings. \nThis is an in-person seminar. If you opt to join via zoom use meeting ID 878 4444 5479 Passcode 058517
URL:https://asrc.gc.cuny.edu/event/photonics-initiative-seminar-ieee/
LOCATION:ASRC Auditorium\, 85 St. Nicholas Terrace\, New York\, NY\, 10031\, United States
CATEGORIES:Photonics
END:VEVENT
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DTSTART;TZID=America/New_York:20241025T150000
DTEND;TZID=America/New_York:20241025T170000
DTSTAMP:20241007T152610Z
CREATED:20240919T180225Z
LAST-MODIFIED:20241007T152610Z
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SUMMARY:Communicating Your Science Series Open House Event
DESCRIPTION:Join us for our rescheduled kickoff of our 2024/25 Communicating Your Science Series\, which helps CUNY STEM students\, postdocs and faculty bone up on their science communications skills. Sponsored by the CUNY ASRC IlluminationSpace Hub\, CUNYSciCom\, BRAINE and CUNY Women in STEM\, this open house event will showcase the resources CUNY offers to help you communicate your science to the public and across STEM disciplines. The new date is: \nFriday\, October 25\, 2024\, 3-5 PM \nAdvanced Science Research Center \n85 Saint Nicholas Terrace \nCafé & Auditorium \nNew York\, NY \n  \nEvent Features \n\nTabling Event – Meet the student-led organizations focused on science communications\nLightening Talks – Short talks by CUNY students across different STEM disciplines showcasing how they make their research accessible and exciting\nGC Resources – Representatives from the Teaching & Learning Center\, Career Planning & Professional Development\, Writing Center\, Library and CUNY ASRC IlluminationSpace will be on hand to discuss their resources\nTour – Take a tour of the ASRC’s facilities and the IlluminationSpace.\nSnacks & Beverage – There will be light fare.\n\nPlease register here for the October 4th Communicating Your Science event. \nFor more information\, contact Shawn Rhea at srhea@gc.cuny.edu
URL:https://asrc.gc.cuny.edu/event/communicating-your-science-series-open-house-event/
LOCATION:Advanced Science Research Center (ASRC)\, 85 St. Nicholas Terrace\, New York\, NY\, 10031\, United States
CATEGORIES:Environmental Sciences,Nanoscience,Neuroscience,Photonics,Structural Biology
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