Hirak Chatterjee

Hirak Chatterjee
Assam University · Department of Chemistry

17.5
 · 
PhD (Chemistry)

About

8
Publications
13,077
Reads
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34
Citations
Introduction
Hirak Chatterjee currently works at the Department of Chemistry, Assam University. Hirak does research in Materials Chemistry, Materials Physics and Materials Science. Their current project is 'Plasmonics of Noble Metal Nanoparticle'.
Research Experience
September 2015 - September 2017
Assam University
Position
  • Senior Research Fellow
Description
  • Asymmetric Nanoparticle: Synthesis, Scattering and Polarization
January 2012 - September 2015
Assam University
Position
  • Junior Research Fellow
Description
  • Presently working on shape and size selective synthesis of noble metal nanoparticles and theoretical study on the effect of environmental dielectric to their optical properties. Also, I am keen to model the effects with DDA, FEM and FDTD.

Publications

Publications (8)
Article
The recent development of nanoscience and nanotechnology enables the synthesis of nano-particles of non-ellipsoidal shape. In this study, to tackle the various inclusion topologies in the framework of micromechanics, the numerical surface integration was used to evaluate the volume-averaged Eshelby tensor for superspheral and superellipsoidal inclu...
Article
Full-text available
The intriguing light–matter interactions can be governed by controlling the particle size and shape, electromagnetic interactions and dielectric properties and local environment of the metal nanostructures. Amongst the different approaches that have been engendered to manipulate light at the nanoscale, the self-assembly of metallic nanostructures w...
Article
A concentric array of Cu@Cu2O core–shell nanostructures and Cu@Cu2O@Cu nanomatryushkas have been synthesized by tailoring the surface oxidation of plasmonic copper nanoparticles through manipulation of binary solvent composition. The concept is based on freezing down the rate of surface oxidation by governing the chemical equilibria directed by Le...
Article
Full-text available
Throughout the history of science, comparison among calculated parameters and experimental observables has been considered as obvious to accomplish and reciprocate a fundamental hypothesis. The exploitation of sharp edges toward a plethora of paraphernalia has been continued from the prehistoric evidence to modern nanotechnology. To validate the hy...
Article
Full-text available
The brilliant colors of dispersions of metallic colloids have been fascinating since antiquity, long before our understanding of light–matter interactions. The ability of noble-metal colloids to manipulate light at the nanoscale has opened up the emerging research area called plasmonics. Metals are considered to be either conductors in electronics...
Article
Full-text available
Physicochemical aspects of anisotropic gold nanostructures have been of considerable interest due to intrinsic shape-dependent phenomena that open up newer perspectives from nanoscale electromagnetism to basic thermodynamics since gold has a highly symmetric face-centered cubic (fcc) structure and usually tends to afford a spherical geometry to red...

Questions and Answers

Question & Answers (70)
Question
I came across the data for solar irradiance in DNI index, the unit of which is given by 4.4 kWh/m2/day. I need to convert it in the unit of intensity.
Please help.
Question
Dear all,
Seasons' greetings.
I am trying to find out the Eshelby's tensor for superellipsoid system. I am following the protocol of finding flux integral from this link https://www3.nd.edu/~nancy/Math20550/Matlab/Assignments/SurfaceIntegrals/surfaceintegrals.html#27
The code returns me the symbolic coefficients, rather than any numeric value.
Please help.
Question
I have encountered with the following error when I coupled wave optics and semiconductor module together. Please help.
Division by zero.
- Function: /
Failed to evaluate expression.
- Expression: if(abs(down(comp1.semi.eta_n)-up(comp1.semi.eta_n))<comp1.semi.delta_eta_tol,down(comp1.semi.Gn),(down(comp1.semi.eta_n)-up(comp1.semi.eta_n))/log(down(comp1.semi.N_num)/up(comp1.semi.N_num)))
Failed to evaluate variable.
- Variable: comp1.semi.Gn_av
- Defined as: if(abs(down(comp1.semi.eta_n)-up(comp1.semi.eta_n))<comp1.semi.delta_eta_tol,down(comp1.semi.Gn),(down(comp1.semi.eta_n)-up(comp1.semi.eta_n))/log(down(comp1.semi.N_num)/up(comp1.semi.N_num)))
Failed to evaluate expression.
- Expression: nojac(comp1.semi.Gn_av)
Failed to evaluate variable.
- Variable: comp1.semi.Dn_down
- Defined as: (down(comp1.semi.mun)*comp1.semi.Vth)*nojac(comp1.semi.Gn_av)
Failed to evaluate variable.
- Variable: comp1.semi.Dn_th_down
- Defined as: comp1.semi.Qthn_down-(comp1.semi.Dn_down*1.5)
Failed to evaluate variable.
- Variable: comp1.semi.Vn_down
- Defined as: ((down(comp1.semi.mun)*comp1.semi.E_down)-(down(comp1.semi.mun)*comp1.semi.grad_chi_down))+((comp1.semi.Dn_th_down*(((comp1.semi.dngx*d(comp1.semi.Tl,x))+(comp1.semi.dngy*d(comp1.semi.Tl,y)))+(comp1.semi.dngz*d(comp1.semi.Tl,z))))/comp1.semi.Tl)
Failed to evaluate variable.
- Variable: comp1.semi.An_expo
- Defined as: (comp1.semi.dc_down*(-comp1.semi.Vn_down))/comp1.semi.Dn_down
Failed to evaluate expression.
- Expression: abs(comp1.semi.An_expo)
Failed to evaluate operator.
- Operator: if
- Geometry: geom1
- Boundary: 261
Failed to evaluate expression.
- Expression: if((abs(comp1.semi.An_expo)+abs(comp1.semi.Bn_expo))<comp1.semi.global_flux_tol_sg,comp1.semi.nQFCn,comp1.semi.nQFSGn)
Failed to evaluate variable.
- Variable: comp1.semi.nJn_hetero
- Defined as: if((abs(comp1.semi.An_expo)+abs(comp1.semi.Bn_expo))<comp1.semi.global_flux_tol_sg,comp1.semi.nQFCn,comp1.semi.nQFSGn)
Failed to evaluate expression.
- Expression: if((abs(comp1.semi.Ec_bnd_up-comp1.semi.Ec_bnd_down)<(eps*abs(comp1.semi.Eg)))&&(abs(up(comp1.semi.Nc)-down(comp1.semi.Nc))<(eps*(up(comp1.semi.Nc)+down(comp1.semi.Nc)))),comp1.semi.nJn_sg,comp1.semi.nJn_hetero)
Failed to evaluate variable.
- Variable: comp1.semi.nJn_int
- Defined as: if((abs(comp1.semi.Ec_bnd_up-comp1.semi.Ec_bnd_down)<(eps*abs(comp1.semi.Eg)))&&(abs(up(comp1.semi.Nc)-down(comp1.semi.Nc))<(eps*(up(comp1.semi.Nc)+down(comp1.semi.Nc)))),comp1.semi.nJn_sg,comp1.semi.nJn_hetero)
Failed to evaluate expression.
- Expression: dvol*comp1.semi.nJn_int
Failed to evaluate Jacobian of expression.
- Expression: (comp1.semi.nJn_int*test(up(comp1.Ne)-down(comp1.Ne)))*(dvol)
Question
Dear Colleagues,
I want to simulate a 3D MOSFET using semiconductor module. But, I am getting this error in the source domain:
Undefined variable.
- Variable: comp1.Ne
- Geometry: geom1
- Boundaries: 23, 34
Failed to evaluate Jacobian of expression.
- Expression: comp1.Ne
Failed to evaluate Jacobian of expression.
- Expression: (-comp1.semi.nJn*test(comp1.Ne))*(dvol)
Please help.
An image is attached herewith for your kind perusal.
Question
Hello Everyone,
I want to calculate DOS for conduction and valance band separately for metals like Cu and Ag. Can I do this using CASTEP?
Question
Can anyone provide me the value for high frequency dielectric constant of Gold?
Question
I need to make a database for optical conductivity of materials from their respective frequency dependent optical permittivity. The unit of optical conductance should be in S/cm. I went up to many references but there are only analytical expressions available. Can anyone provide me the useful relationship that we may use in practice?

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Projects

Projects (2)
Project
To propose basic theoretical modifications towards the plasmonics responses on the basis of shape and size tunability and to model the phenomena with numerical simulation techniques e.g., Discrete Dipole Approximation, Finite Element Method and Drude-Sommerfeld theory of solids.