Projects
WHAT I’VE DONE
Check out my professional portfolio to find out what I’ve worked on. Here, you can find out how I approached my projects from concept to execution, and what skills I brought to the proverbial table that made these a real success. If any of these projects appeal to you, or you have a specific project in mind you’d like me to get involved in, give me a call today.
STUDENT PROJECT
I took this on as a personal project to propel both my personal life and career forward. It was something I'd always wanted to work on, and so I made a point of carving out time after school, on the weekends and spent sleepless nights to make it happen. I learned and applied various innovative ides and had a lot of fun.
PERSONAL RESEARCH PROJECT
While working on optical effects in dye sensitized solar cells, I had deviced plan to further my studies with FDTD simulations. Though work pressure was tremendous, I received co-operation from my colleagues, students and parents. I went on with determination and am happy to share the story with you.
RESEARCH PROJECTS
I really enjoyed working on these project. It gave me an opportunity to be creative and do things a little outside of the box. I also had to push myself initially, however subsequently it became my second nature to get absorbed in solving the questions that I was faced with either through simulations, literature reviews, or getting back to fundamentals.
To discuss the projects I have worked on, contact me today.
HELLO THERE! I'M CHAUDHARI MAYANK KUMAR.
My Skills & Experience
Thanks for visiting! This is where you’ll find my professional experience and skills, my interests and education. I created this site to showcase the one thing I’m sure of - that there’s no one else like me out there. Browse through all the information I’ve provided here, and contact me directly to learn more.
Personal Statement
I am looking to secure a position where I can put my professional knowledge to good use, while simultaneously developing my skills in a business environment. With lots of practical experience to back me up, as well as an extensive skill set, I’ve got the flexibility and necessary experience to get things done right. Want to know more about what I can do for you? Get in touch today.
IMPLEMENTATION OF QUINE–MCCLUSKEY METHOD FOR MINIMIZATION OF BOOLEAN EXPRESSIONS (JANUARY-APRIL 2012)
Student Project
The Quine–McCluskey algorithm (or the method of prime implicants) is used for minimization of Boolean expressions. It is functionally identical to Karnaugh mapping, but the tabular form makes it more efficient for use in computer algorithms, and it also gives a deterministic way to check that the minimal form of a Boolean function has been reached. This was my first C programing project consisting of a 700-line code. The major features of the project include
input/output from/to txt and csv files,
conceptualization and implementations of new number system consisting only of 3 digits-0s,1s and 2s just like binary numbers are consisting of only 0s and 1s,
implementation of complex data structures like two, three and four dimensional arrays and complex control structures.
SELF-INSPIRED, STRONGLY MOTIVATED
Personal Research Projects
SELF-INSPIRED, STRONGLY MOTIVATED
Finite Difference Time Domain Analysis of Metamaterials, metal photonic crystals and plasma-metal photonic crystals
Metamaterials are engineered materials designed to exhibit desired properties. Their properties depend on their design and structure rather than the base materials. The metamaterials exhibiting negative refractive index are attracting enormous research interest and are known as negative index materials. We have started our studies with simulating split ring resonators to obtain negative index and tailored absorption characteristics. The negative index structure will then be optimized for increasing directional efficiency of antennae such as micro-strip antenna.
The metal photonic band gap (PBG) structures have higher power handling capabilities which can be dynamically tuned by introducing plasma as the background medium. These kind of tuneable photonic bandgap structures may find very important applications. The analysis of plasma metallic photonic crystal has been reported in two research papers communicated to Journal of Physics of Plasmas and Journal of Progress in Electrical and Electronics Research. The later reports the non-conventional grid structure and formalism for simulating plasma metallic photonic crystal under application of eternal magnetic field.
Research Projects
SUPERVISOR: DR. P.C. PANDEY, ASST. PROF. INDIAN INSTITUTE OF TECHNOLOGY (BHU)
Theoretical Study of Photonic Crystal Based Thin Film Solar Cells (July 2013 - May 2014)
Thin film solar cells such as dye sensitized solar cells (DSCs) are attracting considerable theoretical and experimental research interest due to their low cost. The construction and working of DSCs differ significantly from p-n junction solar cells. The three basic phenomena namely light absorption, electron transport and hole transport are each handled by different materials in the cell. The light is absorbed by the dye adsorbed on the nano-particle mesh of a wide bandgap semiconductor such as TiO2 or SiO2. The nano-particle mesh is responsible for transportation of electrons that are injected by the dye into the semiconductor material when exited by incident photon. The dye then regains its lost electrons from the electrolyte which is responsible for transportation of holes or positive charged ions. The electrolyte is reduced at the counter electrode by the electron that has arrived after travelling through an external circuit. In our research the effects of coupling 1d photonic crystal, a periodic arrangement of dielectric materials that offers frequency dependent reflection and transmission properties, to DSC are thoroughly analyzed. Photonic Crystals are engineered materials designed to control the flow of light in as much the same way as semiconductors do for electrons. The use of photonic crystal as a brag reflector preserves the added values of the DSCs such as semitransparency which is lost when defused scattering layer or metallic reflector is used to enhance the absorption. Significant enhancement in light harvesting efficiency (LHE or absorption) is achieved when DSCs are coupled to 1d PCs. The origin of enhancement in light harvesting is explained by obtaining light intensity profile within the cell and the absorption depth. The photo-carrier generation rate as a function of depth is also computed for using it as input for the electrical model. The effects of the electrode thickness, and the characteristics of the brag reflections are analyzed firstly using transfer matrix method. A combined geometrical and coherent optics based approach was formulated to appropriately take into account the finite coherence length of light. I developed and implemented algorithms to realize this approach using MATLAB. The results obtained are in closer agreement with the experimental results than the popularly used transfer matrix approach for simplified 1d model. I also envisioned and implemented 1D simulation to show that interference phenomena occurring within the layered media actually followed the envelop generated by transfer matric computations.
SUPERVISOR: DR. P.C. PANDEY, ASST. PROF. INDIAN INSTITUTE OF TECHNOLOGY (BHU)
Analysis of 1d Graded Index Photonic Crystals (August 2014-Jan 2016)
Periodic arrangements of dielectric material in one, two or three dimensions gives rice to a property called photonic band gap by virtue of which the propagation of photons with their energies lying in forbidden region or photonic band gap region along one or more directions is prohibited. Such periodic structures can be used to control the flow of photons as much in same way as periodic arrangements of atoms and molecules in semiconductors control the flow of electrons and thus these are called photonic crystals. Variety of photonic crystals are being investigated for their potential applications in one, two or three dimensional regime. Some of important researches focus on photonic crystals consisting of different materials such as dielectric-dielectric, metal-dielectric, plasma-metal, etc. for their potential use in respective applications. Various researches have shown that versatility of photonic crystals in controlling light propagation can be enhanced by introducing graded modifications in refractive indices. Such photonic crystals, comprising on one or more medium having graded refractive index profile, are called graded photonic crystals (GPCs). In our studies various grading profiles such as linearly and exponentially graded profiles and their various stacking arrangements with non-graded or homogeneous mediums are analyzed. The ability to tune photonic and Omni-directional bandgaps has been demonstrated theoretically in Omni-dimensional photonic crystals having one of the layers as linear graded index materials and other layers of constant refractive index materials. We have analyzed the reflection spectra, photonic bandgap spectra, reflection phase shift and electric field distribution, and found that the number of photonic bands increases with increasing the thickness of layers. We have also examined the Omni-directional bandgap characteristics in quarter-wave stacking arrangements. Results show that different constituted homogeneous layer can change the Omni-directional bandgap remarkably. Moreover, we have demonstrated that photonic bandwidths can be controlled by the contrast of initial and final refractive index of the graded layers also. Gradual variations of relative parameters in GPCs make it very different in the behavior from the conventional PCs and enhance the ability to mold and control the light wave propagation. Such types of PCs may play an important role to design spectral filters, beam aperture and deflector, high efficiency bending waveguides, high efficiency couplers, self-focusing media, artificial optical black holes etc. and can be employed in various optoelectronic devices or photonic circuits. We published the findings in two research papers in reputed journals – Journal of Lightwave Technology and Journal Optik (Elsevier). My main contributions were in terms of implementation and optimization of transfer matrix method, developing new model and formalism, generating absorption depth profiles based on very simple andcomputationally inexpensive approach to gain more physical insights.
IN COLLABORATION WITH SINGAPORE MIT ALLIANCE FOR RESEARCH AND TRAINING (SMART)
SUPERVISOR: PROF. ARMIN ABERLE, PROFESSOR AT ECE@NUS, CEO OF SERIS
CO-SUPERVISOR: DR. SERENA LIN FEN, SENIOR SCIENTIST, SERIS
Characterization of Novel GaAs/GaAs/Si solar cells for Integrated Solar Project
Stacking multiple junctions in decreasing order of electrical bandgap enables harvesting of light more efficiently from a wider spectrum of EM radiation. Owing to their complexity and cost, applications of multi-junction solar cells so far have been limited to space and concentrator solar cells. Novel technological innovations aim to utilize well established Si fabrication processes and integrate them with III-V materials to achieve better capabilities. One example of such efforts integration of III-V tandem on Si solar cell. When the cells are monolithically grown, they are not accessible individually for characterization and the collective behavior depends on the lowest performing cell. Thus, appropriate light and voltage biasing is used to characterize individual sub-cells for diagnostic and yield analysis purposes. Ordinarily, the different sub-cells are made up of different materials and choice of bias light depends on the anticipated spectral response of the corresponding cells. However, in case of novel GaAs/GaAs/Si structure, top and middle sub-cells are made up of same material and thus conventional route to choosing bias light doesn’t apply. A very simple solution was arrived at by analyzing variation of absorption coefficient of GaAs with wavelength. The fraction of light absorbed in each cell depends on the wavelength and required cell can be made to underperform by choosing proper intensity and wavelength of bias light based on this criterion.