Nilabh Roy

Experience

• 

  Indian Institute of Technology, Delhi

  Jan 2013 - Dec 2013

  Undergraduate Researcher

  Modeling and development of a quadrotor based UAV • Developed a dynamic model and a SIMULINK model of the quadrotor and obtained its response• Fabrication and tuning of the quadrotor,controller design using experimentally obtained constants• CFD analysis of propeller, trajectory generation of quadrotor using differential flatness approach

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  JCB India Ltd.

  May 2013 - Jul 2013

  Quality Control Intern

  Failure Modes and Effects Analysis of Hydra-clamp• Analyzed the components at part level, assembly level and design level, used Ishikawa diagram and other quality control tools to find out probable causes of failure• Developed a new Standard operation procedure(SOP) for gap setting in hot test area• Implementation of a new tool for improving the consistency of a sub-assembly• Proposed the usage of 5 micron filter in place of 10 micron filter to reduce oil contamination

• 

  The University of Texas at Austin

  Sept 2014 - Dec 2014

  Graduate Teaching Assistant

  • Taught and administered two lab sessions for the course- Dynamic Systems and Controls lab• Explained the basics of modeling of simple dynamic systems including compound pendulum, two can system,frequency response of an Analog meter• Helped the students to familiarize themselves with data acquisition from sensors using LabView VIs, use the data acquired to identify characteristics of the dynamic system, using control and design module in LabView to simulate the systems.• Evaluated pre-labs, lab evaluation, and quizzes and held office hours to ensure students understood course concepts. Show less

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  Cockrell School of Engineering, The University of Texas at Austin

  Jan 2015 - May 2018

  Graduate Researcher

  As a part of my doctoral studies, I am working on the development of µ- Selective laser sintering system.• Worked on design, fabrication & assembly of 1) Laser & optics (using DMDs) 2) XY precision stage- 2" travel 3) Air bearing system 4) Thermally heated vacuum chuck• Physical & thermal characterization of Cu NPs using SEM, EDS, XPS, DSC, He Pycnometry for use in the µ -SLS system• Performed preliminary sintering experiments with Cu NPs using ns & fs lasersOther Research ProjectsModeling of thermal conductivity of thin metal nanofilms using transmission grating technique• Formulated a 2-dimensional thermal conduction model to analyze heat diffusion in both cross and in-plane directions and simulated results compared with experimental results to extract thermal properties. Modeling and control of web tension and speed in roll to roll graphene transfer • Developed an observer based centralized control scheme (with disturbance rejection) to estimate the tension in a R2R graphene transfer machine, eliminating the need for load cells in the R2R system Show less

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  NXP Semiconductors

  May 2015 - Jan 2018

  3D Packaging Systems Design Intern

  Micro-scale Selective Laser Sintering system• Designed and assembled the precision optical sub-system using DMDs to sinter Cu NPs with 1µm resolution and throughputs comparable to the traditional sintering processes• Designed and developed a flexure based XY nano-positioning stage with sub-micron step size and 2” travel range; designed a robust control algorithm to shift and dampen the resonance of the stage • Designed slot die coating sub-system to spread uniform layers of Cu NP ink (<1 µm thick)• Undertook a comprehensive study on the sintering fluence/irradiance requirements for Cu NPs using fs, ns and CW lasers and developed a simplified model to estimate the fluence requirements• Temperature dependent physical and chemical characterization of Cu NPs using SEM, Differential Scanning Calorimetry, EDS and XPS analysis-to study the behavior of Cu NPs during sintering Show less

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  Canon Nanotechnologies

  Jun 2018 - now

  Leading development of motion, force and alignment systems for high throughput heterogeneous 3D advanced packaging tool• Developed a high precision (single digit nm precision) alignment metrology system in absence of any dedicated alignment marks on the dies and substrates• Prototyped a large FOV, high-res IR imaging system to image through Si substrates for in-line imaging• High bandwidth 6DoF nanopositioning system design and development- Flexure mechanism design for large motion ranges within limited footprint, FEA validation, prototyping, sensor and actuator selection, testing and characterization- system ID and model-based control design• Novel process & tool development- Key processes, sub-systems, metrology development for a high throughput, high yield, and sub 100 nm alignment capability tool Show less • Precision force control - Led the project & developed solutions (both hardware & model-based) to control the imprint force in NIL to achieve <3 nm overlay over multiple wafer lots imprinting, in presence of external process disturbances• Optical sensing prototypes and algorithms for spatially precise curing of resist -Improved curing edge shifting resolution on NIL tools by designing & developing algorithms utilizing grayscaling capability of the DMD; models for characterizing the optical system and correcting registration errors.• Overlay error modeling & corrections – Identified improvements to existing calculation/regression methods for characterizing the overlay errors of the process; Modeled higher order distortions & optimization methods for more efficient & robust overlay error reduction from a tool error standpoint. Show less

  • Principal Research Engineer

    Feb 2024 - now

  • Staff Research Engineer

    Feb 2022 - Jan 2024

  • Senior Research Engineer

    Jun 2018 - Feb 2022