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X-ORIGINAL-URL:https://www.cense.iisc.ac.in
X-WR-CALDESC:Events for CeNSE
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TZID:Asia/Kolkata
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TZOFFSETTO:+0530
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DTSTART:20250101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20260504T160000
DTEND;TZID=Asia/Kolkata:20260504T170000
DTSTAMP:20260611T044658
CREATED:20260428T050814Z
LAST-MODIFIED:20260428T051428Z
UID:10307-1777910400-1777914000@www.cense.iisc.ac.in
SUMMARY:[Seminar] : Smart Multimodal Micro-Spectroscopy for Optoelectronic Materials and In-Operando Devices
DESCRIPTION:Speaker: Dr Sudipta Seth\, Postdoctoral Fellow\, KU Leuven\, Belgium.\n\nTitle: "Smart Multimodal Micro-Spectroscopy for Optoelectronic Materials and In-Operando Devices".\n\nDate: Monday\, 4th May 2026 - Time: 4 PM\n\nTea & Coffee: 5 PM\n\nVenue: CeNSE Seminar Hall\n\nAbstract:\n\nThe performance and stability of optoelectronic devices are conventionally evaluated through \nmacroscopic photophysical and electrical measurements. However\, these bulk properties are \ninherently shaped by complex nanoscopic structural\, chemical\, and functional heterogeneities. \nExternal stimuli such as light\, electric bias\, and environment can significantly influence \nlocal behaviour\, making it essential to probe devices at the micro- and nanoscale under \noperating conditions. Conventional techniques\, like scanning probe microscopy and \nelectron/x-ray-based analytical methods\, offer high spatial resolution but are \nprimarily limited to structural characterisation and often alter operando conditions.\n\n\nTo address these challenges\, I have developed Correlation Clustering Imaging (CLIM)\, a microscale \nfunctional imaging method that utilises photoluminescence fluctuations to reveal contrasts associated \nwith defect dynamics in semiconductor materials. 1\,2 CLIM images correlated with SEM reveal crucial \ninformation about the structure-function relationship in the bare thin films.  The local functional \nregions in a solar cell are more heterogeneous in size and shape than the film on glass. Moreover\, \nthe fluctuation amplitude and functional regions strongly depend on the device's operational regime. \nStatistical analysis of intensity fluctuations provides insights into the type of metastable defects \nresponsible for fluctuating non-radiative recombination processes3 in thin films and operational solar \ncells.\n\nAlthough this methodology enhances our understanding of device photo-physics\, it is fundamentally \nlimited to optical resolution and lacks the local energetic landscape of the devices. My future goal \nis to develop a super-resolution\, multimodal correlative framework that integrates nanoscale spectroscopy \nand AI-driven analytics. This platform will enable in-depth\, in-operando investigation of \noptoelectronic materials\, paving the way for the rational design of efficient\, durable next-generation devices.\n\nReferences\n1. B. Louis¥\, S. Seth¥\, Q. An\, J. Ran\, Y. Vaynzof\, J. Hofkens\, I. G. Scheblykin\, Adv. Mater.\, 2025 37\, \n   2413126.\n2. T. Behera\, B. Louis\, L. Paesen\, R. V. Brande\, K. Asano\, M. Vacha\, M. Roeffaers\, E. Debroye\, \n   J. Hofkens*\, S. Seth*. ChemRxiv 2025\, https://doi.org/10.26434/chemrxiv-2025-5gbh4.\n3. S. Seth\, E. A. Podshivaylov\, J. Li\, M. Gerhard\, A. Kiligaridis\, P. A. Frantsuzov\, I. G. Scheblykin\, \n   Adv. Energy Mater. 2021\, 11\, 2102449.\n\nBiography:\n\nSudipta Seth is currently a Marie Skłodowska-Curie Postdoctoral Fellow at KU Leuven\, Belgium\, \nwhere he conducts advanced research at the intersection of materials chemistry\, optoelectronic devices\, \nand spectroscopy\, through the development of innovative microscopy methodologies. He completed his \nPhD at the University of Hyderabad and subsequently worked as a postdoctoral fellow at Lund \nUniversity and as a visiting researcher at the Tokyo Institute of Technology and Max-Planck \nInstitute for Polymer Research\, Mainz. His work integrates single-particle spectroscopy\, \nsuper-resolution and nanoscale microscopy\, and ultrafast spectroscopy to investigate fundamental \nphoto-physics in semiconductor materials and devices. He has received several academic fellowships\, \nincluding INSPIRE-SHE (India)\, Wenner-Gren Postdoctoral Fellowship (Sweden)\, FWO Research stay \nabroad (Belgium)\, and Marie Sklodowska-Curie Postdoctoral Fellowship (European Commission).\n\nHost Faculty:  Prof. Adithya Sadalana
URL:https://www.cense.iisc.ac.in/event/seminar-smart-multimodal-micro-spectroscopy-for-optoelectronic-materials-and-in-operando-devices/
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20260506T160000
DTEND;TZID=Asia/Kolkata:20260506T170000
DTSTAMP:20260611T044658
CREATED:20260410T053802Z
LAST-MODIFIED:20260410T054047Z
UID:10256-1778083200-1778086800@www.cense.iisc.ac.in
SUMMARY:[Seminar] : Enabling Diversity in Fiber Laser Systems through Power\, Coherence\, and Spectral Control
DESCRIPTION:Speaker: Dr Roopa Prakash\, Marie Skłodowska-Curie Postdoctoral Fellow\, CNRS\, \n         Institut d’Optique Graduate School\, France.\n\nTitle: "Enabling Diversity in Fiber Laser Systems through Power\, Coherence\, and Spectral Control"\n\nDate: Wednesday\, 6th May 2026 - Time: 4 PM\n\nVenue: CeNSE Seminar Hall\n\nAbstract:\n\nFiber lasers provide a versatile platform for generating optical sources with diverse \nperformance characteristics. However\, achieving simultaneous control over power\, coherence\, \nand spectral bandwidth remains challenging due to nonlinear effects\, thermal constraints\, \ngain limitations\, and noise transfer mechanisms. In this talk\, I present a unified approach to \nsystematically engineer these key parameters through my work on high-power fiber lasers\, \nultra-coherent single-frequency and Brillouin lasers\, and spectrally engineered broadband sources. \nI will discuss the strategies used for mitigating stimulated Brillouin scattering\, suppressing noise\, \nand extending wavelength access beyond conventional gain bands. Together\, these results establish a \nframework for designing next-generation fiber laser systems for emerging industrial and scientific \napplications.\n\n\nBiography:\n\nDr. Roopa Prakash is a Marie Skłodowska-Curie Postdoctoral Fellow at the LP2N laboratory \n(CNRS\, Institut d’Optique Graduate School\, University of Bordeaux)\, France. Her research focuses on \nthe development of high-power\, single-frequency fiber lasers based on rare-earth-doped platforms for \nprecision photonics and quantum technologies. She received her PhD from the Centre for Nano Science \nand Engineering (CeNSE) at the Indian Institute of Science (IISc)\, Bangalore\, in 2021\, where she \nworked on nonlinear fiber optics and advanced laser systems\, including supercontinuum\, \noptical frequency combs\, Raman lasers and high-power fiber lasers. Her work includes key \ncontributions to stimulated Brillouin scattering suppression for kW-class power scaling and \nthe development of ultra-coherent fiber lasers using custom fibers.\n\n\nHost Faculty:  Prof. Supradeepa V.R.
URL:https://www.cense.iisc.ac.in/event/seminar-enabling-diversity-in-fiber-laser-systems-through-power-coherence-and-spectral-control/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20260507T160000
DTEND;TZID=Asia/Kolkata:20260507T170000
DTSTAMP:20260611T044658
CREATED:20260422T113519Z
LAST-MODIFIED:20260422T113519Z
UID:10280-1778169600-1778173200@www.cense.iisc.ac.in
SUMMARY:[Seminar] : Q-Carbon: Science to Technology
DESCRIPTION:Speaker: Dr Naveen Narasimhachar Joshi\, Department of Materials Science and Engineering\, \nNorth Carolina State University\, Raleigh\, NC\, USA.\n\nTitle: "Q-Carbon: Science to Technology"\nDate: Thursday\, 7th May 2026 - Time: 4 PM\nHi Tea & Coffee: 5 PM\n\nVenue: CeNSE Seminar Hall\n\nAbstract:\n\nQuenched-in carbon (Q-carbon) is a non-equilibrium carbon allotrope with a dense\, predominantly \nsp3-bonded structure\, enabling enhanced mechanical properties and compatibility with diamond growth. \nIn this talk\, I present the synthesis of pristine Q-carbon films via plasma-enhanced chemical vapour \ndeposition\, using controlled low-energy Ar⁺ ion bombardment. I discuss the formation mechanism and \ndemonstrate wafer-scale integration of high-quality films on substrates up to 12ʺ. Q-carbon enables rapid\, \nadherent growth of continuous diamond films\, overcoming key deposition limitations. I further demonstrate \nintrinsic room-temperature ferromagnetism (TC ~550 K) and enhanced antimicrobial performance\, highlighting \nQ-carbon as a multifunctional platform for electronic\, coating\, and biomedical applications.\n\nBiography:\n\nNaveen Joshi is a PhD candidate in Materials Science and Engineering at North Carolina State University\, USA\, \nworking in Prof. Jagdish Narayan’s group on non-equilibrium synthesis of carbon- and silicon-based thin films for \nmicroelectronic and biomedical applications. He received his MTech. degree from IIT-Kharagpur\, graduating with \nthe Institute Gold Medal. His research spans plasma-assisted CVD\, laser-driven phase transformations\, and \nwafer-scale integration of Q-carbon. As a lead collaborator with Oak Ridge National Laboratory\, he co-discovered \nQ-silicon and received the Excellence in Graduate Research Award. He has authored 20+ journal publications\, \n2 book chapters\, delivered 15+ international presentations\, and serves as a reviewer\, bridging discovery with \nscalable device technologies.\n\nHost Faculty:  Prof. Shivshankar S.A.
URL:https://www.cense.iisc.ac.in/event/seminar-q-carbon-science-to-technology/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20260508T160000
DTEND;TZID=Asia/Kolkata:20260508T170000
DTSTAMP:20260611T044658
CREATED:20260427T061902Z
LAST-MODIFIED:20260427T062320Z
UID:10300-1778256000-1778259600@www.cense.iisc.ac.in
SUMMARY:[Seminar] : Nano Mechanics:  Sensors\, Nonlinear Systems\, and Quantum Interfaces
DESCRIPTION:Speaker: Prof Akshay Naik\, Professor\, CeNSE\, IISc.\n\nTitle: "Nano Mechanics: Sensors\, Nonlinear Systems\, and Quantum Interfaces"\n\nDate: Friday\, 8th May 2026 - Time: 4 PM\n\nHi Tea & Coffee: 5 PM\n\nVenue: CeNSE Seminar Hall\n\nAbstract:\n\nMechanical resonators are widely used for sensing due to their responsiveness to various physical \nstimuli. Their performance in the linear regime is limited by thermomechanical noise and nonlinear \neffects which defines the sensing window. In this talk\, I will show how nonlinearity\, rather than \nbeing a constraint\, can be understood and engineered to control system response. In particular\, \nnonlinear interactions give rise to coupling between vibrational modes\, leading to energy exchange \nand rich dynamical phenomena. I will then discuss how such mode coupling can be used in hybrid systems\, \nwhere mechanical resonators act as intermediaries for transduction between different physical domains\, \nwith potential applications in quantum technologies.\n\nBiography:\n\nAkshay Naik is a faculty member at CeNSE\, IISc Bengaluru\, working at the intersection of nonlinear \ndynamics\, and quantum technologies. His research focuses on NEMS and optomechanical systems\, exploring \nhow nonlinear effects and mode coupling can be engineered for enhanced sensing\, signal processing and \nquantum applications.\n\nHost Faculty:  Prof. Vini Gautam
URL:https://www.cense.iisc.ac.in/event/seminar-nano-mechanics-sensors-nonlinear-systems-and-quantum-interfaces/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20260521T090000
DTEND;TZID=Asia/Kolkata:20260603T170000
DTSTAMP:20260611T044658
CREATED:20260317T060029Z
LAST-MODIFIED:20260317T060144Z
UID:10126-1779354000-1780506000@www.cense.iisc.ac.in
SUMMARY:Advanced workshop on Semiconductor Manufacturing
DESCRIPTION:
URL:https://www.cense.iisc.ac.in/advanced-workshop-on-semiconductor-manufacturing/#new_tab
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20260527T160000
DTEND;TZID=Asia/Kolkata:20260527T170000
DTSTAMP:20260611T044658
CREATED:20260525T092606Z
LAST-MODIFIED:20260525T092647Z
UID:10514-1779897600-1779901200@www.cense.iisc.ac.in
SUMMARY:[Thesis Defense] : Dispersion in Silicon-on-Insulator Micro-ring resonator
DESCRIPTION:Thesis Title             : "Dispersion in Silicon-on-Insulator Micro-ring resonator"\n\nName of the Student     :  Mr. Sudipta Nayak\n\nDegree Registered       : Ph.D. Engineering \n\nAdvisor                : Prof. Akshay Naik\, CeNSE\n\nDate                     : 27th May 2026\, (Wednesday)\n\nTime                    : 4 :00 PM\n\nVenue                 : CeNSE Seminar Hall (Hybrid):\n\nAbstract\n\nSilicon photonics underpins a wide range of applications spanning sensing\, communication\, \ncomputation\, and emerging quantum technologies. A common thread across these platforms \nis their strong sensitivity to refractive index\, with many applications critically relying \non its dynamic modulation. Achieving reliable and predictable device operation\, therefore\, \nrequires accurate characterization of refractive index changes and a clear understanding of \nthe underlying physical mechanisms. In silicon\, refractive index modulation arises from \nmultiple contributions\, including thermal effects\, free-carrier dispersion\, and the Kerr \nnonlinearity. While several techniques have been developed to probe these mechanisms\, \nthey are often limited in the quantities they measure\, restricting their broader applicability.\n\nCavity-enhanced photothermal spectroscopy is a widely used method to characterize Kerr nonlinearity. \nIt employs a pump tone and a probe tone\, both tuned to different resonances of the same optical cavity. \nThe pump intensity is harmonically modulated\, and the resulting oscillations in the probe intensity \nare monitored. Different dispersion mechanisms are studied through the strength of oscillation transfer. \nTypically\, probe amplitude data are analyzed using numerical fits; however\, these fits can be \nnon-unique and can be contaminated by experimental artifacts. Phase data\, a complementary observable\, \nare often affected by phase artifacts.\n\nWe present a method to remove these experimental artifacts and extract the oscillation-transfer phase \ndifference. An Erbium-Doped Fiber Amplifier (EDFA) is introduced before the pump intensity modulator. \nThe amplified spontaneous emission (ASE) passes through the intensity modulator and experiences the \nsame envelope modulation as the pump. A fraction of this ASE propagates through the probe path. Since \nthis ASE leakage undergoes the same experimental artifacts as the probe\, its phase is measured. \nThe intrinsic phase information of oscillation transfer is then obtained by subtracting the leakage \nphase from the probe phase. Using this\n\napproach\, we confirm the presence of free-carrier dispersion in a silicon-on-insulator ring resonator cavity. \nThis method provides a complementary extension to an established technique and remains applicable in regimes \nwhere conventional pump-based phase extraction fails.\n\nNext\, we investigate the nonlinear properties of ReS₂ by studying its effects on SoI ring resonators. \nAll-optical resonance shift measurements and cavity-enhanced photothermal spectroscopy are performed \nbefore and after transferring ReS₂ onto the resonator. Significant inter-device variability is observed \nin both resonance shift and photothermal response. Intra-device variability is also seen when the same \ndevice undergoes different surface processes. A possible explanation is proposed based on existing literature \non linear absorption loss in silicon\, its surface-dominated nature\, and its sensitivity to surface chemistry.\n\nAdditionally\, we study on-chip metal–semiconductor–metal (MSM) and graphene photodetectors. \nFor MSM devices\, current–voltage characteristics and photo-response are measured. \nThe responsivity and dynamic range of photoresponse are characterized. We show that these MSM \ndevices are suitable for integration with optomechanical systems. For graphene photoconductors\, \nwe demonstrate successful fabrication and performance comparable to that reported in the literature. \nFinally\, we suggest a direction for further exploration through the fabrication of \nMSM graphene–silicon–graphene devices using atomic force microscope lithography.\n\nThis work extends a well-established technique and improves its robustness. It provides new \ninsights into dispersion in silicon-on-insulator microring resonators\, highlighting the sensitivity \nof micro-cavity behavior to surface effects. Finally\, it validates multiple directions for future \nexploration of MSM and graphene photodetectors.
URL:https://www.cense.iisc.ac.in/event/thesis-defense-dispersion-in-silicon-on-insulator-micro-ring-resonator/
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