I am pursuing Ph.D. in Electrical Engineering under Professor Dr. Judson D. Ryckman. My primary research focuses on silicon and porous silicon photonics, biosensing, nanofabrication and metasurfaces.

News

• [Nov 2020] Published in PNAS !!
• [Oct 2020] Paper published in Optics Express
• [Oct 2020] My friend Sarwar publishes paper in Journal of Building Engineering that I contributed to during my undergrads
• [Jul 2020] Published in ACS Applied Nano Materials
• [Mar 2020] 2 Talks in CLEO Conference 2020
• [Jan 2020] 3 conference papers accepted in PSST 2020. PSST postponed due to COVID-19
• [Aug 2019] First paper published in Optics Express
• [Apr 2019] Passed Ph.D. qualifying exam !!
• [Dec 2018] Started visiting ORNL as a user/visitor for nanofabrication. Learned tons of stuff!!




Skills

MATLAB, Python, C, Assembly
Primarily a C programmer, I believe my ability to write code in any language gives me an advantage in my field. We exclusively use MATLAB in our research group which made me very comfortable in MATLAB. However, I am also fairly proficient in Python and C.


Photolithography, Electron Beam Lithography, Grayscale Lithography, ICP-RIE Dry Etch- Wet KOH Etch
Being a visitor/user in Oak Ridge National Lab has been a great experience and bolstered my nanofabrication skills.


Edge coupled waveguides, HF Etch, KOH etch, SEM, AFM, Thin Film Analyzers, Hydraulic press, Evaporator (Cr, Pt), Reflectometer, 3D Profilometry
I've been trained to use various instruments to characterize my research on nanophotonics and nanofabrication.


KLayout, Lumerical MODE – FDTD – Interconnect, Simulink, COMSOL, AutoCAD, Beamer
Abovementioned are selected softwares I learned that assist my research.


Raspberry Pi, Microcontrollers (Arduino, AVR), Filters, Sensors, Oscilloscope, Signal Generator, Soldering
I've been a embedded systems programmer in my undergrads in which my group tinkered with various projects. See my undergrads projects section for more details.






Education

PhD Student in Electrical Engineering (Aug 2017 - present)
Holcombe Department of Electrical and Computer Engineering
Clemson University, USA


MS in Electrical Engineering (Dec 2019)
Holcombe Department of Electrical and Computer Engineering
Clemson University, USA
Thesis: Porous Silicon Photonics at Unity Confinement Factors for Surface Adlayer Biosensing

BS in Electrical Engineering (Apr 2016)
Department of Electrical and Electronic Engineering
Shahjalal University of Science and Technology, Bangladesh
Thesis: High Efficiency Multijunction Solar Cells





Professional Experiences

Graduate Research Assistant (Aug 2017 - Present)
Office: Room C110, Duke Energy Innovation Center
Nanophotonics Lab, Ryckman Group
91 Technology Drive, Anderson, SC 29625

Lecturer (Feb 2017 - Aug 2017)
Department of Computer Science and Engineering
Sylhet Engineering College
Courses: Introduction to Electrical Engineering, Introduction to Electrical Engineering Lab





Publications

Hyperchromatic structural color for perceptually enhanced sensing by the naked eye [pdf]
, Bria McCoy, Sarah K. Timmins, Taufiquar Khan, Judson D. Ryckman
Proceedings of the National Academy of Sciences, 117 (48) 30107-30117, Nov 2020

Multifunctional focusing and accelerating of light with a simple flat lens [pdf]
, and Judson D. Ryckman
Optics Express, Vol. 28, Issue 21, pp. 30597-30605, Oct 2020

Nanoimprinting of Refractive Index: Patterning Subwavelength Effective Media for Flat Optics [pdf]
, Julius C. Perez, and Judson D. Ryckman
ACS Applied Nano Materials, 3, 8, 7377-7387, Jul 2020

Single-mode porous silicon waveguide interferometers with unity confinement factors for ultra-sensitive surface adlayer sensing [pdf]
, Gabriel D. Allen, Ivan I. Kravchenko, Judson D. Ryckman
Opt. Express 27, Vol. 27, Issue 16, pp. 22485-22498, Aug 2019

Status of thermal comfort in naturally ventilated university classrooms of Bangladesh in hot and humid summer season [pdf]
Md. Sarwar Jahan Talukdar, , Manoj Kumar Singh , Md. Abdul Baten, Md. Shahadat Hossen
Journal of Building Engineering, Volume 32, 101700, Oct 2020





Patents

Porous waveguide sensors featuring high confinement factors and method for making the same [link]
Judson Ryckman, Gabriel Allen, William Frederick Delaney,
US Patent App. 16/561,093 (Patent pending)





Conference Proceedings

High figure of merit interferometric sensors: exceeding the sensitivity of bulk porous silicon via waveguide dispersion
, Ivan Kravchenko, Judson D. Ryckman
Porous Semiconductors Science and Technology (PSST) 2020

Nanoimprinting refractive index using mesoporous silicon substrates
Julius Perez, Tahmid Hassan Talukdar, Judson D. Ryckman
Porous Semiconductors Science and Technology (PSST) 2020

Hyperchromatic structural color: perceptually enhanced biosensing by the naked eye or smartphone
, Bria McCoy, Sarah Timmins, Taufiquar Khan, Judson D. Ryckman
Porous Semiconductors Science and Technology (PSST) 2020

Small Scale Wireless Data Transmission via Light Using Light Source
,
International Conference on Engineering, Research, Innovation and Education (2017)

32.325% Efficiency PIN Junction Gallium Arsenide Solar Cell with Reduced Thickness and Textured Front Surface

International Conference on Engineering, Research, Innovation and Education (2017)

Study of Single Junction Si Solar Cells for Maximum Efficiency
, ,
5th International Conference on Informatics, Electronics & Vision (2016)

Study of Single Junction Solar Cell Characteristics Varying Different Parameters
, ,
2015 International Conference on Electrical Engineering and Information Communication Technology (2015)





Test Scores

GRE - 327
Quant - 166, Verbal 161, AWA - 4.0
My preparation duration was two weeks. To know what I studied, click HERE.

IELTS - 8.5
Listening - 9.0, Reading - 8.5, Writing - 7.5, Speaking - 8.0
My preparation duration was one week. For my study materials, click HERE.





Graduate School Projects

Developed an optical assay for naked eye colorimetric sensing of biomolecules
Porous silicon thin film-based sensor utilized with a multi-color illuminant allows ultra-high colorimetric sensitivity. Validated using APTES, Sulfo-SMC, Biotin and Protein biomarkers. Currently working to enhance sensitivity and functionalize DNA monolayer detection. Published in PNAS, the second most cited journal in the past 10 years. See more.

Process developed a method of imprinting refractive index laterally on the surface of a chip
A simple two-step method for patterning refractive index on the surface of a chip is introduced. The process is referred to as “nanoimprinting of refractive index” (NIRI) and enables very wide and patternable tuning of refractive index over a range Δn ≈ 1 RIU. NIRI opens a new route for harnessing the subwavelength degree of freedom and offers the prospect of realizing high-performance and low-cost flat optics. See more.

Ultra sensitive unity confinement waveguide sensors
we create a mesoporous silicon waveguide design and inverse fabrication technique that achieves maximal transverse confinement factor (~99%) and preserves single-mode operation. The waveguide sensors are characterized in a Fabry-Perot interferometer configuration and the ultra-high sensitivity to small molecule adlayers is demonstrated. We also identify dispersion to be a promising degree of freedom for exceeding the sensitivity limits predicted by the conventional non-dispersive effective medium theory.




Undergrad Projects

Implementation of submarine robot for underwater navigation and communication
A unconventional submarine robot was built using PVC, Water Pumps and Brushless DC Motors. The shape was unconventional, so it made way for electronics and batteries to be put in the middle. Communication was done via SONAR via Arduino. RF does not work underwater so it could not be used. See the preprint document here.

Small scale data transmission via light
A commercially available low cost (1$ to be exact) light sensor was used to detect the light when transmitted via light. LED flashes, then home tubelights were used to vary the frequency to match the bit information. The found speeds were not remarkable, but has room for improvement if we do the implementation better. A better sensor will lead to a higher data rate. Read the paper here.

Remote home appliance control using DTMF Technology in cellphones
We decided to ditch the conventional GSM technology and went for DTMF instead. Read the paper here.

Remote controlled robot car (Pioneer) using Atmel AVR
We built an RF controlled robot car in our first year using an AVR microcontroller and cheap mechanical parts.

Boolean equation generator from arbitrary logic input using Quine–McCluskey algorithm (using C programming language)
This was a second year project that I did alone. I wrote this program based on Quine-Mccluskey algorithm that can take logic tables as inputs and give boolean equations as outputs. Check the software section for the github link.

Construction of a 200VA power transformer
It was a machine lab project. We practically wound laminated wires around an iron lump to make the transformer.

Designing a fire security system in a market floor on architectural drawing.
This group project was done as a partial fulfilment of electrical service design lab.

Construction of a three-phase inductive load
Was made using solenoids of known resistance and reactance. Wye and Delta both connection options were kept.

Designing of electrical service system of a student hall
Done as a lone project for partial fulfilment of electrical service design lab.





Contact

Tahmid Hassan Talukdar
Department of Electrical and Computer Engineering
Clemson University
91 Technology Dr. Anderson
Clemson, South Carolina 29672

email:   ttalukd [at] clemson (dot) edu