Shuvendu JenaBhabha Atomic Research Centre | BARC · Atomic & Molecular Physics Division
Shuvendu Jena
Ph. D.
About
65
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Introduction
The broad research interest is thin film optics and photonics that includes both experiment and theory. The experimental works are directed to explore optical properties of thin films of dielectric, semiconducting, and metallic materials, and use them to develop customized thin film and multilayer optical coating devices. The theoretical works are focused on tunable 1D photonic crystals in the THz region and hybrid photonic structures for sensing and filtering applications.
Publications
Publications (65)
Tamm plasmon provides a new avenue in plasmonics of interface states in planar multilayer structures due to its strong light matter interaction. This article reviews the research and development in Tamm plasmon polariton excited at the interface of a metal and a distributed Bragg reflector. Tamm plasmon offers an easy planar solution compared to pa...
Coupling of topological interface states in a one dimensional photonic crystal has been systematically investigated in a broad energy region of electromagnetic spectrum. The robust topological interface states appear when the Zak phase between the adjoining photonic crystals are different at their common photonic bandgap. The coupled interface stat...
Boron carbide films deposited by PECVD are subjected to post deposition vacuum annealing and plasma treatment for investigation of changes in the structure, linear and non-linear optical properties of the films. Deconvolution of core level XPES spectra of B1s, C1s and O1s indicates changes in the surface chemical states of the constituent atoms aft...
Tamm plasmon provides a new avenue in plasmonics of interface states in planar multilayer structures due to its strong light matter interaction. This article reviews the research and development in Tamm plasmon polariton excited at the interface of a metal and a distributed Bragg reflector. Tamm plasmon offers an easy planar solution compared to pa...
![Transmittance spectra as a function of incidence frequency [THz] for an...](profile/Ibrahim-Mahariq/publication/359512444/figure/fig2/AS:1167419917766656@1655346006138/Transmittance-spectra-as-a-function-of-incidence-frequency-THz-for-an-Octonacci_Q320.jpg)
Here we would like to discuss the light transmission modulation by the one-dimensional polymeric quasi-multilayer which is formed according to substitutional generalized Octonacci with PMMA and PS as the constituent materials. In particular, we will present some theoretical findings using the well-known transfer matrix method. The width of the PBG,...
The substrate self-bias plays a significant role in determining the nature and magnitude of the residual stress in the nat boron carbide thin films deposited by Radio Frequency Plasma Enhanced Chemical Vapour Deposition (RF-PECVD) technique. The residual stress in films was calculated with the help of surface curvature method. Films were deposited...
Transmission properties of light through disorder polymeric photonic crystals have been studied. The photonic crystals made of polymeric multilayers with Gaussian distribution of layer thickness are found to exhibit robust photonic bandgap (PBG). The transmission characteristics of different random structures starting from periodic to gradually per...
Rabi-like splitting and self-referenced refractive index sensing in hybrid plasmonic-1D photonic crystal structures have been theoretically demonstrated. The coupling between Tamm plasmon and cavity photon modes are tuned by incorporating a low refractive index spacer layer adjacent to the metallic layer to form their hybrid modes. Anticrossing of...
Measured optical transmission spectrum of photonic structure comprising TiO2/Ag/TiO2/Ag multilayer is reverse engineered by employing transfer matrix method with three different multilayer models to analyse the factors responsible for the annealing induced changes in the transmission. The multilayer is made to have a single peak or a passband in th...
Here we would like to discuss the light transmission modulation by the one-dimensional polymeric quasi-multilayer which is formed according to substitutional generalized Octonacci with PMMA and PS as the constituent materials. In particular, we will present some theoretical findings using the well-known transfer matrix method. PBG inter-band spacin...
The present finding illuminates the physics of the formation of interfaces of metal based hetero-structures near layer continuous limit as an approach to develop high-efficiency W/B4C multilayer (ML) optics with ML periodicity varying d = 1.86-1.23 nm at a fixed number of layer pairs N = 400. The microstructure of metal layers is tailored near the...
We have theoretically demonstrated Rabi-like splitting and self-referenced refractive index sensing in hybrid plasmonic-1D photonic crystal structures. The coupling between Tamm plasmon and cavity photon modes are tuned by incorporating a low refractive index spacer layer close to the metallic layer to form their hybrid modes. Anticrossing observed...
Most of the manufacturing techniques used to fabricate one dimensional photonic crystal (1DPC) inherently generate roughness at the interfaces, which significantly affects their performance. In the preset work, the effect of interface roughness on the optical response of the 1DPCs with and without a defect layer for different number of periods (N =...
A new one-dimensional photonic crystal (1DPC) containing moderately doped silicon (m-Si) semiconductor is proposed and its tunable properties are theoretically investigated. The tunable complex permittivity of m-Si with temperature is the central idea that makes the 1DPC thermally tunable. The 1DPC systems such as (m-Si/SiO2)¹² and defective (m-Si/...
Radio-Frequency Plasma Enhanced Chemical Vapour Deposition (RF-PECVD), and Pulsed Laser Deposition (PLD) techniques were used to deposit boron carbide (BxC) thin films. Films were investigated to compare crystallinity, chemical composition, optical properties, and residual stress. X-ray diffraction analysis revealed that the film deposited by PLD w...
A user-friendly software PRISA has been developed to determine optical constants (refractive index and extinction co-efficient), dispersion parameters (oscillator energy and dispersion energy), absorption co-efficient, band gap and thickness of semiconductor and dielectric thin films from measured transmission spectrum, only. The thickness, refract...
A simple user-friendly software named PRISA has been developed to determine optical constants (refractive index and extinction co-efficient), dispersion parameters (oscillator energy and dispersion energy), absorption co-efficient, band gap and thickness of semiconductor and dielectric thin films from their measured transmission spectrum, only. The...
For designing precision optical devices, there is always a quest for new materials having superior optical, chemical, mechanical etc., properties. Al2O3MgO exhibits excellent mechanical, optical and chemical properties which make it a potential candidate to be used in developing optical coatings and devices. In present work, Al2O3MgO thin film has...
The efficiency of quantum dot (QD) to convert sunlight to electricity is based on the principle of multiple exciton generation (MEG), such that a single photon produces more than one electron-hole pair. The zero-dimensional structure of QD leads to spatial confinement of electronic energies. The energy levels of electrons in QDs depends on their si...
E-beam evaporation equipped with glancing angle deposition arrangement (GLAD) was used to fabricate nanostructured polytetrafluoroethylene (PTFE) films in a single-step coating process. Three sets of PTFE coatings were prepared using various oblique angles, e-beam currents, and deposition times to explore the effects of deposition parameters on the...
Nano and subnanometric thin-film multilayer interference optical coatings and devices have been playing key as well as essential roles in the manipulation and transport of electromagnetic radiations in various areas of applications such as lasers, telecommunications, smart windows, astronomy, aerospace, environmental monitoring, display, lighting,...
Zirconia - Alumina – Magnesia (ZrO2Al2O3MgO) ternary composite thin films are used in the fabrication of interference multilayer thin film devices for lasers and photo-physical applications. Optical, structural and morphological properties of such thin films deposited under varying deposition parameters, are reported by researchers. Such thin films...
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Mechanical tunability of mid-infrared mirrors and filters made of one dimensional photonic crystal (1DPC) containing polymers has been theoretically investigated under hydrostatic compression. The elasto-optic properties of the polymer materials such as poly(methyl-methacrylate) (PMMA) and polystyrene (PS) are considered for tuning the properties o...
The evolution of residual stress and its correlation with microstructure are investigated systematically in nano-scaled periodic W/B 4 C multilayers (MLs) as a function of individual layer thicknesses at the ultra-thin limit (∼0.4–3 nm). Details of the microstructure are accessed through hard X-ray reflectivity and X-ray diffuse scattering (rocking...
Hafnium dioxide (HfO 2 ) thin films are generally used as high refractive index layers in optical coating devices. Aging effects on optical and mechanical properties of the films are very crucial for long-standing performance and stability of the devices, therefore knowledge of the aging effects is very important. In the present work, HfO 2 thin fi...
The microstructure and residual stress are investigated in W/B4C x-ray multilayer (ML) mirrors as a function of the number of layer pairs (N) varying from 20 to 400 at a fixed period, d ≈ 1.9 nm. The microstructure is analyzed using the x-ray reflectivity (XRR) and rocking scan methods. The total residual stress in the ML film is derived using the...
HfO2 thin films were deposited by electron beam evaporation technique at different oxygen (O2) partial pressures. The films are characterized using x-ray diffraction, x-ray reflectivity, spectrophotometry, atomic force microscopy, substrate curvature measurement and laser induced damage threshold (LIDT) measurement techniques. All the films show am...
The effect of annealing on the structural and optical properties of thermally evaporated Ge30Se70 and Ge30Se60Bi10 thin films is reported in this paper. The prepared films were thermally annealed at 250°C to optimize the optical properties which can be used for the optical device fabrication. X-ray diffraction study revealed no structural transform...
Reflection loss occurs at the glass-air interface, limits performance of many optical devices such as eyeglass, camera lenses, and photovoltaic solar cells. Antireflection (AR) coating on the glass reduces the reflection loss and improves efficiency of such devices. In this paper, wideband AR coating in the visible region has been designed and deve...
In the present work, a set of ZrO2 thin films have been deposited at 82 degree angle of deposition at several substrate rotation speeds and at 0 degree. The effect of substrate rotation on optical, structural, morphological properties and residual stress has been studies thoroughly. Refractive index estimated from ellipsometric measurement and suit...
Optical and structural properties of vacuum evaporated Ge30Se70-xBix (x = 0, 5, 10, 15 and 20) thin films are discussed in the present report. The physical properties such as coordination number ( ), average heat of atomisation (Hs), average bond energy (Hs/ ), energy gap (Eg), and lone pair electrons (L) for different Bi concentration were calcula...
TiO2/SiO2 periodic multilayer high reflection mirrors have been prepared using electron beam deposition. The deposited mirrors are annealed in the range from 300°C to 500°C. The high reflection band of the mirror shifts towards shorter wavelength with increasing annealing temperature. The band width and band to midband ratio of the high reflection...
HfO<sub>2</sub>/SiO<sub>2</sub> periodic multilayer high reflection mirrors have been prepared by a reactive electron-beam evaporation technique. The deposited mirrors were annealed in the temperature range from 300°C to 500°C. The effects of annealing on optical, microstructural, and laser-induced damage characteristics of the mirrors have been in...
In present work, HfO2
thin films have been deposited at various oblique incidences on Si substrates by electron beam evaporation. These refractory oxide films exhibited anisotropy in refractive index predictably due to special columnar microstructure. Spectroscopic
ellipsometry being a powerful tool for optical characterization has been employed to...
A polarized wavelength multiplexer with high laser induced damage threshold has been developed to combine two laser beam of high peak power in the visible region. The present wavelength multiplexer is a multilayer
thin film device
deposited by reactive electron beam evaporation. The developed device is capable of combining two p-polarized laser bea...
Oblique angle deposited oxide thin films, in which refractive index profiles can be tailored across depth by tuning their microstructure using varying angle of deposition, have opened up new dimensions in fabrication of optical interference devices. Since surface morphology plays an important role for the qualification of these thin film devices fo...
ZrO2:10 %SiO2 thin films have been deposited on fused silica substrate by reactive electron beam co-evaporation technique at different oxygen partial pressure. The structural analysis shows tetragonal phase with distortion of the lattice in the films. The intensity of the tetragonal t(110) phase are found increasing with increasing oxygen pressure....
Oblique angle deposited oxide thin films have opened up new dimensions in
fabricating optical interference devices with tailored refractive index profile
along thickness by tuning its microstructure by varying angle of deposition.
Microstructure of thin films strongly affects surface morphology as well as
optical properties. Since surface morpholog...
The change in photo-induced optical properties in thermally evaporated Ge12Sb25Se63 chalcogenide thin film under 532-nm laser illumination has been reported in this paper. The structure and composition of the film have been examined by X-ray diffraction and energy dispersive X-ray analysis, respectively. The optical properties such as refractive in...
The multilayer
structure of TiO2/SiO2 (11 layers) as one dimensional photonic crystal (1D PC) has been designed and then fabricated by using asymmetric bipolar pulse DC magnetron sputtering technique for omnidirectional photonic band gap. The experimentally measured photonic band gap
(PBG) in the visible region is well matched with the theoreticall...
One-dimensional periodic metal-dielectric multilayer
thin film structures consisting of Ag and Ta2O5 alternating layers are deposited on glass substrate using RF magnetron sputtering technique. The spectral property of the multilayers has been investigated using spectrophotometry technique. The optical parameters such as refractive index, extinctio...
The present article provides an overview of optical and morphological characterization of optical thin
films by using spectrophotometry and atomic force microscopy (AFM) respectively. The basic principle
of spectrophotometer for thin film transmission measurement is discussed briefly. The optical properties
such refractive index, extinction co-effi...
The photo-induced effects of Ge12Sb25S63 films illuminated with 532 nm laser light are investigated from transmission spectra measured by FTIR spectroscopy. The material exhibits photo-bleaching (PB) when exposed to band gap light for a prolonged time in a vacuum. The PB is ascribed to structural changes inside the film as well as surface photo-oxi...
Oblique angle deposition of oxides is used routinely for fabricating inhomogeneous thin films with proven correlation between refractive index and the angle of deposition. Inhomogeneous layers play a key role in the development of rugate interference devices for photo-physical applications. Such obliquely deposited thin films show high porosity whi...
Effects of high-dose neutron irradiation on chemical and optical properties of CR-39 were studied using FTIR (Fourier Transform Infrared) and UV-vis (Ultraviolet-Visible) spectroscopy. The primary goal was to find a correlation between the neutron dose and the corresponding changes in the optical and chemical properties of CR-39 resulted from the n...
Oblique angle deposition of oxides is being famous for fabricating
inhomogeneous thin films with variation of refractive index along thickness in
a functional form. Inhomogeneous layers play a key role in the development of
rugate interference devices for photo-physical applications. Such obliquely
deposited thin films show high porosity which is a...
Atomic force acoustic microscopy (AFAM) is a useful nondestructive technique for measurement of local elastic modulus of materials at nano-scale spatial resolution by measuring the contact resonance spectra for higher order modes of the AFM cantilever. The elastic modulus of RF sputtered HfO2 thin film has been measured quantitatively, using refere...
Oblique angle deposited optical thin films have attracted recent researcher’s interest because of their attractive optical, micro-structural, mechanical properties and more importantly because of their great potential in achieving tunability in refractive index. These properties in turn make it important in case of designing different optical devic...
In present work, the optical and the morphological properties of micro-structured SiO2 thin films fabricated by using glancing angle deposition (GLAD) technique has been carried out. The results are compared with the normally deposited SiO2 films for the gained advantages. The influence of the glancing angle on the refractive index of porous SiO2 f...
Chalcogenide glasses are interesting materials for their infrared transmitting properties and photo-induced effects. This paper reports the influence of light on the optical properties of Sb10S40Se50 thin films. The amorphous nature and chemical composition of the deposited film was studied by X-ray diffraction and energy dispersive X-ray analysis...
HfO<sub>2</sub>-SiO<sub>2</sub> mixed composite thin films have been deposited on fused silica substrate by co-evaporation of HfO<sub>2</sub> and SiO<sub>2</sub> through the reactive electron-beam evaporation technique. The composition-dependent refractive index and the absorption coefficient have been analyzed using different effective medium appr...
This study is carried out to establish a correlation between optical absorbance and track density
in CR-39 detectors exposed to different fluences of D-T (14 MeV) neutrons. This can be useful in estimating the neutron fluence and hence the dose without involving the tedious track counting procedure, especially when the track density is extremely hi...
Mixed composite materials are highly useful for fabrication of interference based precision multilayer optical devices because of their tunabile refractive imdex, tunable optical band gap and low optical losses with improved laser damage resistance. In the present study, ZrO2-SiO2 (90:10) mixed composite thin films have been prepared by electron-be...
Thin films of composite materials are being progressively explored for achieving tunability in the optical constants for application in multilayer optical devices. In the present study, a set of ZrO2–MgO binary mixed composite thin films have been prepared by reactive electron beam evaporation of solid solution of ZrO2 and MgO at different oxygen p...
Post nondestructive analyses of an all-dielectric multilayer Fabry-Perot interference filter developed through a reactive electron beam deposition process have been carried out through numerical reverse engineering of transmission spectra, Rutherford backscattering spectroscopy and quartz crystal monitoring data to derive multilayer geometry, depos...
Envelope method and Inverse synthesis method are two commonly used
method for evaluating the optical constants and thickness of the
thinfilms from the optical transmission measurement. The two methods
along with their evaluation in terms of accuracy and simplicity are
presented in this paper by determining the optical constants and
thickness of ZrO...
In the present study, ZrO2-MgO composite thin films have been
prepared at different substrate temperature by reactive EB evaporation
of solid solution of ZrO2 and MgO. We have utilised quantum
mechanical parametric Tauc-Lorentz-Urbach (TLU) dispersion model to
extract optical constants from transmission spectra of the thin films.
These films have a...
In the present study, composite thin films HfO2-SiO2 with varying HfO2
composition have been deposited by coevaporation of HfO2 and SiO2
through reactive electron beams technique. Pulse laser induced damage
threshold (PLIDT) studies of composite thin films have been carried out
using single shot mode of second harmonic of Nd: Yag laser. PLIDT
studi...
Binary composite oxide (ZrO2-MgO) thin films have been prepared by
electron-beam evaporation at different oxygen partial pressures. The
effect of oxygen pressure on the optical properties and surface
morphology of binary composite oxide thin films have been studied. The
optical constants and thickness of the films have been derived by
reverse synth...
Projects
Projects (4)
The idea is to improve the performance of thin films multilayer based optical coating devices such as high reflection mirror, anti-reflection coating, beam combiner, beam-splitter, band pass filter, etc. This is only possible by improving the thin film properties during deposition by optimizing process parameters such as oxygen pressure, substrate temperature, rate of deposition, etc. or by post deposition processing such as annealing, laser conditioning, etc. These works are being carried targeting the above mentioned objectives.
The aim of the work is to probe and understand the stress evolution in thin films and multilayer coatings. The residual stress is measured using substrate curvature method.
The objective is to investigate the tunable optical properties of various one dimensional photonic crystal under externally applied parameters such as pressure, temperature, electric field, magnetic field, etc. This research will be useful for the development of novel photonic devices.