42 publications
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DC and RF Analysis on Specific Quantum-Well HeterostructuresBy Subhadeep Mukhopadhyay
Abstract: Polarization-graded AlGaN back-barrier nano-layer is introduced in high electron mobility transistor (HEMT) structure to have an improved drain current characteristics and better radio-frequency performance, using two-dimensional drift-diffusion simulation by SILVACO-ATLAS physical simulator. In this work, the AlGaN/AlN/GaN/AlGaN/GaN double heterojunction HEMT structure is optimised with graded back barrier layer to study the DC and RF performances. Investigation of this structure with graded back barrier layer is the novelty of this work. …
Published in Journal of Semiconductor Devices and Circuits · Vol. 9, Issue 1, 2022 · pp. 1–13 Read article →
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Surface-Driven Microfluidic Flow in Fluid MechanicsBy Subhadeep Mukhopadhyay
Abstract: In this short report, a brief review on surface-driven microfluidic flow is provided. Also, the maskless lithography and indirect bonding technique are used to fabricate a single SU-8 based glass microfluidic device. Dyed ethylene glycol is prepared as working liquid to test the fabricated device. The surface-driven microfluidic flow of dyed ethylene glycol is recorded by a CMOS camera catching 25 frames per second with a corresponding time-scale resolution of …
Published in Recent Trends in Fluid Mechanics · Vol. 8, Issue 3, 2021 · pp. 1–5 Read article →
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Short Experimental Report on Lithographic Technique in MicrofluidicsBy Subhadeep Mukhopadhyay
Abstract: In this experimental work, a single SU-8 based glass microfluidic device is fabricated by the maskless lithography and indirect bonding technique. The sealing by indirect bonding technique is perform during the hard baking in maskless lithography. Dyed ethylene glycol is prepared as the working liquid. A CMOS camera catching 25 frames per second with a corresponding time-scale resolution of 0.04 second is used to record the surface-driven microfluidic flow of …
Published in Journal of Microwave Engineering and Technologies · Vol. 8, Issue 3, 2021 · pp. 1–5 Read article →
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Flow and Filtration of Polystyrene Microparticles in Micron-Scale Fluid Mechanics towards the Applications related to fluidic Microelectromechanical SystemsBy Subhadeep Mukhopadhyay
Abstract: Maskless lithography, hot embossing lithography and direct bonding technique are useful to fabricate the polymethylmethacrylate (PMMA) microfluidic devices. Also, maskless lithography and indirect bonding technique are useful to fabricate the SU-8 based glass microfluidic devices. In this work, a short review on microfluidic flow and microfluidic filtration of microparticles is provided by author related to the micron-scale fluid mechanics. This review may be useful to perform the blood filtration in …
Published in Journal of Microelectronics and Solid State Devices · Vol. 8, Issue 3, 2021 · pp. 36–41 Read article →
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Design and Performance of Semiconductor-BiosensorBy Subhadeep Mukhopadhyay, Avrajyoti Dutta
Abstract: In this work, a high electron mobility transistor (HEMT) based biosensor is designed to detect the virus-protein. In this work, all the simulation-studies are carried out in the SILVACO-ATLAS physical simulator using the following models: Shockley Read Hall (SRH), band gap narrowing, Auger recombination, and Fermi Dirac statistics. Newton trap numerical solver is used in the device simulation. Conduction band engineering of the biosensor is studied. DC and RF properties …
Published in Journal of Semiconductor Devices and Circuits · Vol. 8, Issue 2, 2021 · pp. 1–13 Read article →
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Experimental Investigations to Improve the Electrical Characteristics of Nitride-Based Nanoelectronic High Electron Mobility TransistorsBy Subhadeep Mukhopadhyay, Avrajyoti Dutta
Abstract: In this work, the DC and RF performances of conventional nanoelectronic high electron mobility transistor (HEMT) are compared with those of two individually modified HEMT structures in a nano-scale regime. All simulation results are produced by the SILVACO- ATLAS physical simulator according to the performed designs of HEMT structures. In each of these HEMT structures, the formation of quantum well is demonstrated at unbiased condition. In the DC analysis of …
Published in Journal of Semiconductor Devices and Circuits · Vol. 8, Issue 1, 2021 · pp. 14–30 Read article →
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Chemical Processing of SU-8 Photoresist to Record the Surface-Driven Microfluidic Flow of Dyed Working Liquid in the Regime of Fluid MechanicsBy Subhadeep Mukhopadhyay
Abstract: Chemical processing of negative photoresist SU-8 is performed to fabricate a set of three individualSU-8 based glass microfluidic devices inside the cleanroom laboratory. The major steps of SU-8processing are spin coating using a spin coater, soft baking, ultra-violet (UV) exposure, post exposurebaking, development by SU-8 developer, and hard baking. The indirect bonding for leakage-freesealing is used during hard baking to fabricate the microfluidic devices. Author has prepared thedyed water to …
Published in Emerging Trends in Chemical Engineering · Vol. 8, Issue 1, 2021 · pp. 53–57 Read article →
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Short Report on Capillary Flow in MicrofluidicsBy Subhadeep Mukhopadhyay
Abstract: In this experimental work, a single SU-8 based glass microfluidic device is fabricated by masklesslithography and indirect bonding technique. The sealing between glass lid and SU-8 basedmicrochannel structure is performed by indirect bonding technique during the hard baking. Dyed wateris prepared as working liquid to record the surface-driven capillary flow in microfluidics using a CMOScamera catching 25 frames per second with a corresponding time-scale resolution of 0.04 second. Thiswork may …
Published in Journal of Materials & Metallurgical Engineering · Vol. 11, Issue 1, 2021 · pp. 34–37 Read article →
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Experiments to Control the Surface-Driven Microfluidic Flow of Dyed Water in Straight PMMA Microchannels Fabricated by Maskless Lithography, Hot Embossing Lithography and Direct Bonding TechniqueBy Subhadeep Mukhopadhyay
Abstract: Total six individual straight microchannels are fabricated by maskless lithography, hot embossing lithography and direct bonding technique using author’s own hands-on completely inside the cleanroom laboratory. Polymethylmethacrylate (PMMA) is the selected polymeric material to fabricate these straight microchannels. Dyed water is prepared as working liquid to record and study the microfluidic flow characteristics inside these fabricated microchannels. Air dielectric barrier discharge (DBD) plasma processing is the surface modification technique in …
Published in Journal of Thin Films, Coating Science Technology & Application · Vol. 7, Issue 1, 2020 · pp. 17–23 Read article →
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Experimental Demonstration on Microfluidic Capillary Flow of Red Dye in Photoresist based Glass Microfluidic DevicesBy Subhadeep Mukhopadhyay
Abstract: In this experimental work, a set of three individual SU-8 based glass microfluidic devices are fabricated by maskless lithography and indirect bonding technique in leakage-free conditions. Commercially available red coloured food dye is used as the selected working liquid. The microfluidic leakage in other set of two leaky microfluidic devices is experimentally demonstrated. Microfluidic devices should be fabricated at leakage-free conditions to achieve exact fluid flow characteristics. The effect of …
Published in Journal of Thin Films, Coating Science Technology & Application · Vol. 7, Issue 1, 2020 · pp. 1–7 Read article →
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Experimental Study on the Surface-Driven Capillary Flow of Aqueous Microparticle Suspensions in the Straight PMMA MicrochannelsBy Subhadeep Mukhopadhyay
Abstract: The straight polymethylmethacrylate (PMMA) microchannels are fabricated by the maskless lithography, hot embossing lithography and direct bonding technique. Total 120 individual PMMA microfluidic devices are fabricated by author’s own hands-on completely. Total 120 individual audio video interleave files as ‘FileName.avi’ are recorded and analyzed by author. The surface-driven capillary flow of different aqueous microparticle suspensions are recorded in these straight PMMA microchannels. The effects of channel aspect ratio, effective viscosity …
Published in Emerging Trends in Chemical Engineering · Vol. 3, Issue 3, 2016 · pp. 26–30 Read article →
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Experimental Investigations on the Durability of PMMA Microfluidic Devices Fabricated by Hot Embossing Lithography with Plasma Processing for Bioengineering ApplicationsBy Subhadeep Mukhopadhyay
Abstract: In this research paper, total 1290 individual static contact angles of different working liquids have been measured and recorded on the flat polymethylmethacrylate (PMMA) surfaces. Total 474 individual PMMA microfluidic devices have been fabricated by the maskless lithography, hot embossing lithography and direct bonding technique inside the cleanroom laboratory and mechanical engineering workshop to determine the durability of these microfluidic devices. Total nine individual working liquids have been used to …
Published in Emerging Trends in Chemical Engineering · Vol. 3, Issue 3, 2016 · pp. 1–18 Read article →
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Recording of Leakage-free Surface-Driven Capillary Flow of Dyed Water in the Dual Sudden Contraction MicrochannelsBy Subhadeep Mukhopadhyay
Abstract: Dual sudden contractionpolymethylmethacrylate (PMMA) microchannels are fabricated by the maskless lithography, hot embossing lithography, direct bonding technique, and atmospheric pressure air dielectric barrier discharge (DBD) plasma processing. The surface-driven capillary flow of dyed water is faster on the processed PMMA surface than the pristine PMMA surface. The surface-driven capillary flow of dyed water is slower in the wider portion and faster in the narrower portion of any dual sudden contraction …
Published in Emerging Trends in Chemical Engineering · Vol. 4, Issue 2, 2017 · pp. 40–44 Read article →
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Surface-Driven Capillary Flow of AqueousIsopropyl Alcohol in the Sudden Expansion PMMA MicrochannelsBy Subhadeep Mukhopadhyay
Abstract: Author has fabricated the PMMA sudden expansion microchannels by the maskless lithography, hot embossing lithography, drilling, direct bonding and chip separation technique. The effect of channel aspect ratio on the surface-driven capillary flow is studied in the sudden expansion microchannels fabricated by PMMA as a polymeric material. Also, the effect of surface wettability on the surface-driven capillary flow is studied in the sudden expansion microchannels fabricated by PMMA. This study …
Published in Emerging Trends in Chemical Engineering · Vol. 4, Issue 2, 2017 · pp. 1–4 Read article →
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Educational Review on the Applications of Diamond-Like Carbon Films in Fluid EngineeringBy Subhadeep Mukhopadhyay
Abstract: In this present review paper, author has described the applications of diamond-like carbon (DLC) films in microfluidic devices from the point of view of materials-science. According to author’s earlier reports, the speed of surface-driven water flow is varied by the coating of DLC films in PMMA microfluidic devices. Also, according to author’s earlier reports, the speed of surface-driven water flow is varied by the coating of DLC films in SU-8 …
Published in Journal of Thin Films, Coating Science Technology & Application · Vol. 6, Issue 3, 2019 · pp. 1–7 Read article →
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Effect of PMMA Micropillars on the Surface-Driven Capillary Flow of Dyed Aqueous Isopropyl Alcohol in PMMA Microfluidic DevicesBy Subhadeep Mukhopadhyay
Abstract: In this work, dyed aqueous isopropyl alcohol [60% isopropyl alcohol (IPA), 40% dyed water] is prepared as the working liquid. The effect of surface modification on the microfluidic flow of aqueous isopropyl alcohol (IPA) is studied in the polymethylmethacrylate (PMMA) microfluidic devices. The effect of surface area to volume ratio on microfluidic flow of aqueous isopropyl alcohol is also studied. The effect of microfluidic friction on microfluidic flow of aqueous …
Published in Journal of Catalyst & Catalysis · Vol. 6, Issue 2, 2019 · pp. 44–47 Read article →
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Microfluidic Flow of the Dyed Aqueous Isopropyl Alcohol in a single SU-8 based Glass Microfluidic Device Fabricated inside the Cleanroom LaboratoryBy Subhadeep Mukhopadhyay
Abstract: A single SU-8 based glass microfluidic device is fabricated by maskless lithography and indirect bonding technique, using author’s own hands-on completely inside the cleanroom laboratory. Dyed aqueous isopropyl alcohol (90% dyed water, 10% isopropyl alcohol) is the prepared working liquid in this work. The surface-driven microfluidic flow of working liquid is recorded by a CMOS camera catching 25 frames per second with a corresponding time-scale resolution of 0.04 second. The …
Published in Journal of Catalyst & Catalysis · Vol. 6, Issue 1, 2019 · pp. 10–13 Read article →
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Short Review on Maskless Lithography in MicrofluidicsBy Subhadeep Mukhopadhyay
Abstract: Maskless lithography is a part of the overall microfabrication technique to fabricate the polymer based microfluidic devices. Polymer based microfluidic devices are fabricated using the polymethylmethacrylate (PMMA) and SU-8 as two commonly used polymers. PMMA microfluidic devices are fabricated by the maskless lithography, hot embossing lithography and direct bonding technique. SU-8 based glass microfluidic devices are fabricated by the maskless lithography, and indirect bonding technique. Therefore, maskless lithography is proved …
Published in Emerging Trends in Chemical Engineering · Vol. 6, Issue 1, 2019 · pp. 32–34 Read article →
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Surface-Driven Capillary Flow of the Dyed Aqueous Ethanol in a single SU-8 based Glass Microfluidic Device integrated with the Arrays of Square Polyimide MicropillarsBy Subhadeep Mukhopadhyay
Abstract: In this work, a single SU-8 based glass microfluidic device is fabricated by the maskless lithography and indirect bonding technique. A particular polyimide layer at the selected portions and the arrays of square polyimide micropillars at the other portions are integrated on the microchannel bottom wall by the maskless lithography. Dyed aqueous ethanol (70% dyed water, 30% ethanol) is prepared as the working liquid in this work. A CMOS camera …
Published in Journal of Thin Films, Coating Science Technology & Application · Vol. 6, Issue 1, 2019 · pp. 33–37 Read article →
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Fabrication of the SU-8 based Glass Microfluidic Devices to Record the Surface-Driven Capillary Flow of WaterBy Subhadeep Mukhopadhyay
Abstract: Total 12 individual leakage-free SU-8 based glass microfluidic devices are fabricated by the maskless lithography and indirect bonding technique. The surface-driven capillary flow of dyed water is successfully recorded inside these microfluidic devices. Total 12 individual audio video interleave files as ‘FileName.avi’ are recorded and analyzed in this research paper. This study may be useful for different microfluidic applications.
Published in Journal of Thin Films, Coating Science Technology & Application · Vol. 3, Issue 3, 2016 · pp. 9–12 Read article →