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SUMMARY:Thesis Defense: Shixiong Yin
DESCRIPTION:Enhanced Light-Matter Interactions in Complex Photonic Systems \nMentor: Andrea Alù \nAbstract  \nInteractions between light and matter are fundamental to breakthroughs in lasers\, sensing\, imaging\, spectroscopy\, energy harvesting\, and quantum information processing. As a result\, significant recent efforts have been geared towards enhancing and controlling light-matter interactions to advance these applications and technologies. Complex engineered photonic systems\, often involving nanoscale designs of photonic components\, have provided fertile grounds to manipulate light unprecedentedly\, achieving extreme control over interactions among photons and between light and matter. In this dissertation\, we exploit four types of complexity to enhance light-matter and light-light interactions in various photonic platforms. \nFirst\, we start by tailoring the spatial complexity in photonic designs\, which can stimulate unusual light interactions with plasmonic materials. In a one-dimensional metamaterial\, i.e.\, an artificially engineered periodic structure\, we show that perturbing the discrete translational symmetry can induce a topological knot in reciprocal space. It enables strong nonlocal coupling between a dark mode and a brighter surface mode\, which offers new opportunities for efficient sensing and Raman scattering. \nIntroducing complexity in the material constituents together with deliberate spatial designs\, we further explore how nonlinearities in metamaterials unleash novel forms of controlling light emission\, leveraging strongly enhanced interactions with light. Besides\, blending different types of materials can also push the limits of complex photonic designs. We design an ultrasmall nanocavity hybridizing two distinct materials — a high-index dielectric encapsulated by the low-loss metal\, demonstrating record-high Purcell enhancement. The proposed hybridized nanocavity is expected to enhance quantum emission and strong coupling substantially. \nAs another degree of freedom\, complexity can be introduced in the temporal dimension. Time variations in material properties provide a new knob for complex photonic designs. Among them\, time-interfaces\, realized by switching the properties of the entire medium in time\, introduce striking complexity in wave dynamics. In a transmission-line metamaterial\, we have observed time reflections at a photonic time interface and associated broadband and ultrafast frequency translation for the first time. Combining multiple time interfaces in the same platform\, we realize a passive photonic time crystal\, which holds the prospect of extreme interaction with light with zero energy cost\, inaccessible in either time-invariant or conventional time-varying systems. \nFinally\, we harness the complexity in the frequency domain. Complex spectral responses and modal patterns can arise in wave-chaotic systems. In this context\, we realize coherent control over photon-photon interactions in a chaotic photonic microcavity involving over a thousand optical modes. Efficient control of its radiation is further demonstrated via reflectionless scattering modes\, paving the way for efficient energy harvesting\, routing\, and conversion. \nZoom Meeting ID: 722 951 7086 Passcode: 2024 \nMembers of the doctoral faculty are invited to attend.
URL:https://asrc.gc.cuny.edu/event/thesis-defense-shixiong-yin/
LOCATION:ASRC 5th Floor Data Visualization Room\, 85 St. Nicholas Terrace\, New York\, NY\, 10031\, United States
CATEGORIES:Photonics
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DTSTART;TZID=America/New_York:20241115T140000
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SUMMARY:Photonics Initiative Seminar: Bing Cheng
DESCRIPTION:Terahertz probes of quantum matter: from pairing symmetry to high harmonics\nQuantum materials often harbor emergent orders and phases that reveal themselves at low-energy scales\, around 1 to 10 meV. To investigate these collective behaviors\, we turn to the terahertz energy regime—a crucial window for probing and controlling quantum phenomena. In this talk\, I will present our latest breakthroughs in unraveling the superconducting gap structure of the newly discovered unconventional nickelate superconductors— a topic that has sparked intense debate and remains unresolved. Using both linear and nonlinear terahertz spectroscopy\, we uncovered multiple evidence to demonstrate a cuprate-like d-wave gap structure in nickelate superconductors\, providing key insights to steer future research in this field. Expanding beyond understanding\, I will broaden the discussion to the manipulation of quantum materials through light. I will show how we harness intense terahertz pulses to drive the electronic structure of a Dirac semimetal\, leading to the observation of record-breaking terahertz high harmonics. Our findings position topological materials as promising platforms for delving into high harmonic generation and strong-field physics. \nBrief Bio: Bing Cheng earned his Ph.D. in Johns Hopkins University in Sep 2019. Then he moved to Stanford\, and Ames National Lab\, working as a postdoc researcher. At present\, He is working as a research fellow in Prof. Mengkun Liu’s group at Stony Brook University. His research mainly focuses on discovering and understanding exotic quantum phases of matter using a suite of terahertz optics
URL:https://asrc.gc.cuny.edu/event/photonics-initiative-seminar-bing-cheng/
LOCATION:ASRC 1st Floor Seminar Room\, 85 St. Nicholas Terrace\, New York\, NY\, 10031\, United States
CATEGORIES:Photonics
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DTSTART;TZID=America/New_York:20241125T100000
DTEND;TZID=America/New_York:20241125T110000
DTSTAMP:20260521T001824
CREATED:20240801T123937Z
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SUMMARY:Photonics Initiative Seminar: David Burghoff
DESCRIPTION:Nonlinear Photonics in the Mid-Infrared and Terahertz\nAbstract – Optical sensing at long wavelengths presents significant opportunities and significant challenges. The longwave infrared and terahertz ranges are renowned for their potential to sense molecules in a variety of contexts\, such as high-speed chemical imaging\, disease detection\, and environmental monitoring; however\, their promise has yet to be fulfilled due to a lack of compact broadband sources and low-loss integrated photonics platforms. The most important sensing challenges require extremely wideband sources to achieve specificity and selectivity\, but to date\, there are no technologies that are compact\, bright\, and broadband. \nI will discuss some of the work of my group that seeks to address this challenge. First\, I will discuss our development of quantum cascade laser-based frequency combs\, light sources that fill the gap between broadband incoherent sources and lasers. I will also discuss how our experimental investigations of these combs led to my discovery of a new fundamental comb state that manifests in almost any laser at any wavelength\, acting as the phase equivalent of passive modelocking [1]\, [2]. Next\, I will discuss our recent development of ultra-low-loss platforms for long wavelengths based on hybrid photonic integration\, which allowed us to create optical resonators in the longwave infrared with quality factors 100 times better than the state-of-the-art [3]\, [4]. This approach is fully wavelength-scalable and allows for the first efficient nonlinear optics at long wavelengths\, serving as a foundational element for future applications in quantum sensing. Finally\, I will discuss our development of ptychoscopy\, a new sensing modality that allows for ultra-precise measurements of optical spectra. This measurement enables the measurement of remote signals with quantum-limited frequency resolution over the entire bandwidth of a comb\, for the first time allowing incoherent spectra to be characterized with the precision techniques of combs [5]. \n[1] D. Burghoff\, “Unraveling the origin of frequency modulated combs using active cavity mean-field theory\,” Optica\, vol. 7\, no. 12\, pp. 1781–1787\, Dec. 2020.  [2] M. Roy\, Z. Xiao\, S. Addamane\, and D. Burghoff\, “Fundamental scaling limits and bandwidth shaping of frequency-modulated combs.” (in press\, Optica) [3] D. Ren\, C. Dong\, S. J. Addamane\, and D. Burghoff\, “High-quality microresonators in the longwave infrared based on native germanium\,” Nat. Commun.\, vol. 13\, no. 1\, Art. no. 1\, Oct. 2022.  [4] D. Ren et al.\, “Low-loss hybrid germanium-on-zinc selenide waveguides in the longwave infrared\,” Nanophotonics\, Jan. 2024.  [5] D. J. Benirschke\, N. Han\, and D. Burghoff\, “Frequency comb ptychoscopy\,” Nat. Commun.\, vol. 12\, no. 1\, p. 4244\, Jul. 2021. \nBio – David Burghoff is an Assistant Professor in the Chandra Department of Electrical and Computer Engineering at UT Austin\, where his lab blends photonics and quantum science to develop novel sensing and computing modalities. Prior to this\, he was an assistant professor at Notre Dame and a research scientist at MIT (where he also received his Ph.D.). His awards include the IRMMW-THz Society Young Scientist Award\, Young Investigator Awards from the ONR\, AFOSR\, and NSF\, the Gordon and Betty Moore Foundation’s Inventor’s Fellowship\, and the J.A. Kong Award for MIT’s Best Electrical Engineering Thesis. He is also the lead investigator of the PRISM project\, a Multidisciplinary University Research. \nThis is an in-person seminar. If you opt to join via zoom use meeting ID 871 0407 4948 Passcode 624821
URL:https://asrc.gc.cuny.edu/event/photonics-initiative-fall-2024-seminar-series-david-burghoff/
LOCATION:ASRC Auditorium\, 85 St. Nicholas Terrace\, New York\, NY\, 10031\, United States
CATEGORIES:Photonics
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