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DTSTART;TZID=Asia/Kolkata:20260825T110000
DTEND;TZID=Asia/Kolkata:20260825T120000
DTSTAMP:20260819T055432Z
CREATED:20260819T055229Z
LAST-MODIFIED:20260819T055432Z
UID:10787-1787655600-1787659200@www.cense.iisc.ac.in
SUMMARY:[Thesis Defense] : Engineering Light-Matter Coupling and Thermal Transport in Freestanding Two-dimensional Materials
DESCRIPTION:Thesis Title : "Engineering Light-Matter Coupling and Thermal Transport in Freestanding \n                Two-dimensional Materials"\n\nName of the Student : Mr. Manavendra Pratap Singh\n\nDegree Registered : Ph D Engineering \n\nAdvisor : Prof. Akshay Naik\, CeNSE\n\nDate : 25th August 2026\, (Tuesday)\n\nTime : 11:00 AM\n\nVenue : CeNSE Seminar hall\n\n\nAbstract:\n\nTwo-dimensional (2D) materials\, especially semiconducting transition-metal dichalcogenides (TMDCs)\, \nare widely studied due to their strong interactions with light and their unique optical and thermal \nproperties. They hold promise for future optoelectronic\, sensing\, and nanoscale thermal management \ndevices. The surrounding dielectric environment significantly influences the properties of these \natomically thin materials. The optical and thermal properties of 2D materials can be modulated by \nvarying the underlying substrate material\, thickness\, or trench depth in suspended samples\, thereby \naltering interference\, absorption\, and heat dissipation. In this thesis\, we study the fabrication \nand characterization of various trench geometries to tune Raman and photoluminescence (PL) signals \nand to investigate thermal transport in 2D TMDCs.\n\nIn the first part of the thesis\, we fabricated trenches of varying depths on the substrate via \ngrayscale electron-beam lithography (g-EBL). Previous studies have used multiple samples to optimize \nsubstrate thickness for enhanced optical properties\, making it difficult to separate sample-to-sample \nvariations. To overcome this issue\, it would be ideal to have a single flake on/ suspended over varying \nsubstrate thicknesses/trench depths in a single sample. Our strategy enables us to fabricate trenches of \ndifferent depths with nanometre-scale control on the same SiO2/Si substrate\, followed by reactive-ion etching (RIE). \nFinally\, we introduce two types of grayscale structures: (i) staircase structure\, and (ii) holey structure in \nthe SiO2 for systematic investigation of Raman and PL of the 2D TMDCs.\n\nThe second part presents the Raman and PL enhancements of 2D TMDCs transferred onto these grayscale structures. \nWe have observed ∼90-fold Raman and ∼150-fold PL intensity enhancements in monolayer MoS2 for a specific air \ngap and SiO2 thickness combination. The multilayer reflection model (MRM) captures the observed intensity \nvariations with SiO2 thickness in our experiments and allows us to predict changes in Raman peak positions as a \nfunction of absorbed power. By using a single flake across the array of structures\, these structures offer a simple \nsolution to reduce sample-to-sample data variation. This method can also be applied to other 2D materials to enhance \ntheir emitted optical intensity.\n\nThe final part of the thesis investigates the anisotropic in-plane thermal conductivity (κ) of freestanding few-layer \nrhenium disulfide (ReS2). Literature suggests strong anisotropic behaviour in the thermal studies of bulk ReS2 \n(thickness > 60 nm). Whether this anisotropy is maintained in few-layer ReS2 has not yet been explored. We have \nfabricated freestanding few-layer ReS2 samples on SiO2/Si holey substrates for optothermal Raman characterization. \nPolarization-dependent Raman measurements revealed variation in thermal conductivity along the high symmetry axes. \nOur results demonstrate clear in-plane anisotropy in κ for both AA and AB stacking orders. AA stacking shows higher \nκ than AB stacking along both directions\, and κ increases with thickness\, more predominant in AB stacking. The \nexperimental results are further supported by density functional theory (DFT) calculations. The in-plane thermal \nconductivity of few-layer ReS2 devices\, which varies with thickness\, holds significant potential for nanoscale \nthermoelectric applications.
URL:https://www.cense.iisc.ac.in/event/thesis-defense-engineering-light-matter-coupling-and-thermal-transport-in-freestanding-two-dimensional-materials/
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DTSTART;TZID=Asia/Kolkata:20260831T160000
DTEND;TZID=Asia/Kolkata:20260831T170000
DTSTAMP:20260819T064900Z
CREATED:20260819T060218Z
LAST-MODIFIED:20260819T064900Z
UID:10795-1788192000-1788195600@www.cense.iisc.ac.in
SUMMARY:[Seminar] : Droplets and Vapours in Microscale Devices
DESCRIPTION:Speaker: Prof Prosenjit Sen\, Professor\, CeNSE\, IISc.\n\nTitle: "Droplets and Vapours in Microscale Devices"\n\nDate: Monday\, 21st August 2026 - Time: 4 PM\n\nHi Tea & Coffee: 5 PM\n\nVenue: CeNSE Seminar hall\n\nAbstract:\n\nDroplets are ubiquitous in modern engineering\, serving as critical components in a \nvast array of applications ranging from electronics manufacturing and material printing \nto biochemical reactors and organ-mimicking platforms. As their size decreases\, surface \ntension increasingly governs their behaviour\, giving rise to phenomena that are both \nscientifically intriguing and technologically important. While this surface-tension \ndominance can be advantageous in some applications such as compartmentalized micro-biochemical \nreactors. In other applications it also introduces profound challenges in the precise creation\, \nhandling\, and management of fluids in highly constrained environments\, such as high-resolution \ndroplet printing and atomic vapor cells.\n\nThis talk will explore how interfacial phenomena can be understood and engineered across a range \nof applications. I will begin with composite droplets\, focusing on how their interface structure \nand material properties determine their equilibrium shapes and dynamic response. I will then discuss \nhow the rapid collapse of a liquid cavity and the singular flow generated during this process can be \nexploited to produce a single droplet on demand. Next\, I will address the challenges of containing \nand hermetically sealing liquids and vapours\, particularly in miniaturized atomic-vapour cells for \nquantum sensing and related devices. Finally\, I will show how multiscale-structured surfaces can \ncontrol liquid spreading\, evaporation\, and boiling to improve device cooling. These examples \ndemonstrate how the same fundamental physics of droplets and interfaces can enable solutions \nacross manufacturing\, quantum technology\, and thermal management.\n\nBiography:\n\nProsenjit Sen is a faculty member at CeNSE\, IISc Bengaluru\, working in interfacial microfluidics \nfor Lab-on-Chip & other applications. His research focuses on Microfluidics\, Lab-on-chip\, Droplets\, \nInterfacial phenomenon in microfluidics\, Fluidic sensors\, Heterogeneous integration.\n\nHost Faculty:  Prof. Vini Gautam
URL:https://www.cense.iisc.ac.in/event/seminar-droplets-and-vapours-in-microscale-devices/
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