Lovely Professional University, India
Resonant third harmonic generation (THG) of self-focused Hermite-cosh-Gaussian (HchG) laser beam in plasma is investigated. HchG laser beam gets self-focused while propagating in plasma due to ponderomotive nonlinearity which further enhances the efficiency of THG. Ponderomotive force-induced density perturbation produces density oscillations at second harmonic frequency which couples with oscillatory velocity of electrons at laser frequency to produce a third harmonic nonlinear current. Significant enhancement in the efficiency of THG is observed by using HchG laser profile for mode index m=2 in the presence of wiggler magnetic field.
Dr. Niti Kant is a Professor at Department of Physics, Lovely Professional University, Phagwara, Punjab, India. He received Ph.D. degree in Plasma Physics from IIT Delhi in 2005. His research is focused on the areas of ultra-short intense laser interaction with plasmas and semiconductors, laser-plasma based accelerators, harmonic generations and THz radiation. He has supervised 26 PG and 7 Ph.D. students and published more than 80 research papers in various international SCI journals. He visited several countries e.g. UK, USA, Poland, South Korea, Egypt etc. and presented his research work at various international conferences/workshops. He is also a member of different renowned associations/societies e.g. OSI, PSSI, ISCA, IET, UKRI etc. Dr. Kant has been receiving Research Excellence and Research Appreciation Awards from Lovely Professional University since 2014 consecutively. He was also awarded with Best Researcher Award for 2020 by InSc and Science Father agencies.
CSIR-National Physical Laboratory, India
For optoelectronic device application, Gallium nitride (GaN) is a promising material due to its direct band gap and high electron mobility. However, their optical absorbance being limited to within the ultraviolet (UV) range constrains their deployment in broadband photodetectors. Here, I‘ll be discussing the fabrication of heterostructure of two-dimensional molybdenum disulfide (MoS2) and epitaxial GaN films which was developed to enhanced spectral absorption profile. The interfacial properties of 2D/ 3D heterojunctions display staggered gap band structure leads to a rectifying heterojunction phenomenon making them suitable for broadband photodetection from ultraviolet to visible solar spectrum. The fabricated heterostructure exhibits significantly enhanced responsivity (order of 104 A/W) and external quantum efficiency that are 500% higher than the bare GaN photodetectors. The high figures-of-merit of 2D MoS2 with 3D GaN heterostructure broadband photodetector open up opportunities in designing efficient optoelectronic junctions and imaging applications.
Dr. Govind Gupta is Senior Principal Scientist&Head, Sensor Devices & Metrology Group, CSIR-NPL, New Delhi, India and Professor, Academy for Scientific & Innovative Research (AcSIR).His core area of expertise is the of growth of III-Nitrides, metal oxide and layered 2-dimensional materials, fabrication of smart optical & gas sensors, surface &interface Physics, etc.. He has published ~250 research articles in SCI journals and supervised many Ph.D. theses.He is a Senior Member of IEEE (USA), Associate Academician, APAMand received numerous awards & fellowships including MRSI medal, Young Scientist Medal-National Academy of Sciences, India, BOYSCAST fellowship, etc.
University Technology Malaysia, Malaysia
Dr. Sib Krishna Ghoshal is currently Associate Professor of Physics at the Faculty of Science, University Technology Malaysia since 2010. From 2004-2010 worked in the Physics Department and Materials Science Program of Addis Ababa University, Ethiopia, Africa as Associate Professor in the United Nations Development Program for the expansion of Graduate Studies. He served as senior lecturer and promoted as reader at Guru Jambheshwar University of Science and Technology, India during 1998-2006. He received PhD degree in Condensed Matter & Statistical Physics in 1996 from School Physical Sciences, Jawaharlal Nehru University (Delhi, India). Carried out two post-doctoral researches one in Martin Fisher School of Physics (Brandeis University, USA) during 1999-2000 and the other in a joint research project of Indian Institute of Technology (Delhi) & Oxford University (UK) in 1996-1998. Supervised few Master Theses with Nicola Marzari (MIT, USA) and worked with Sir Roger Elliotte (Oxford, UK). He received Master Degree in Physics in 1989 from Premier Presidency University, Calcutta and BSc (Physics Honors) degree in 1986 from Calcutta University. Besides having a long innings-spanning almost three decades in teaching Physics/Materials Sciences at various levels and advising an appreciable number of doctoral and masters theses, he possesses a remarkable research profile too. He published over 600 research articles (334 in Journals with total impact factor of 660), 15 book chapters, and 7 books. His Google scholar h-index is 38, i10-index is 111 and citations are 4691. So far, he received 55 research grants, supervised 25 PhD, 80 MSc, and 65 undergraduate theses. He is listed as top 2% scientists in physics worldwide in 2020. His recent research interests are in Advanced Optical Materials, Statistical Condensed Matter Physics, Nanomaterials Syntheses and Applications, Laser Physics, Simulation and Modeling as well as Nanoscience. One of his major concerns other than research pursuits is the social impact of science and technology on environment, marginalized societal groups deprived of higher education, and the imbalances thereupon in the distribution of its fruits and adverse impacts on these stakeholders.
Lovely Professional University, India
Efficient electron acceleration is studied in vacuum and plasmas due to various laser polarisations such as Radially, circularly and linearly polarized laser. The electron energy is resonantly enhanced due to application of external magnetic field of few kG. Further, frequency chirp also increases the interaction between laser and electron field and hence electron energy is further increased for optimum laser and applied field parameters. We have investigated the electron acceleration in plasma and vacuum. In plasma, it is possible to enhance electron more efficiently due to high gradient, whereas as vacuum is free from instabilities, electron acceleration is comparatively easy, and the electron energy can be enhanced due to application of external magnetic field and frequency chirp. Magnetic field plays a crucial role in accelerating the electron due to resonance between laser and electron’s electric field. Frequency chirp further facilitates electron to retain the energy due to increase in the interaction duration between the laser and electron. The comparisons have been made for these external effects on electron energy in vacuum and plasma.
Jyoti Rajput was born in Punjab, India. She received her Ph.D. degree from NIT Jalandhar, Punjab, India in 2019. She is currently an Associate professor of Physics at Lovely Professional University, Punjab, India. Her research focused areas deal with laser induced electron acceleration in vacuum and plasma (DLA, LBWA, PBWA), harmonic generation and THz radiation. She has published around 15 research articles in various international SCI journals and presented her research work at various international conferences/workshops. She is also a member of different renowned associations/societies e.g., PSSI, ISCA etc.
University of Canterbury, New Zealand
Lanthanide ion (Ln3+) doped upconverting nanoparticles are capable of converting low-energy near-infrared (NIR) photons into high-energy visible photons. This upconversion fluorescence has tremendous importance for a broad spectrum of applications in bio-imaging, drug delivery, theranostics, photovoltaics, security and several applications in nanomedicine. Despite promising applications in many technologically relevant areas, the comparatively low upconversion fluorescence yield typically obtained, limits practical application of such materials. Nanoparticles of varying size, dopant concentration, surface modifications, different host, and
core/shell nanostructures have been explored to enhance the upconversion fluorescence quantum yield. However, investigations which relate these variables to the absorption and excitation spectra are not found in the literature. It is crucial to understand the absorption and excitation dynamics of the of Yb3+ ions in upconverting nanoparticles to determine the optimum pump wavelength and to gain insight into the energy transfer processes, which essentially govern the optical properties of lanthanide ion doped nanoparticles. This work gives an indepth view of the pathways to improve the upconversion fluorescence in fluoride based nanoparticles.
Sangeetha Balabhadra has completed herPhD from the Department of Physics, University of Aveiro, Portugal. She has been working as a postdoctoral researcherinUniversity ofCanterbury, New Zealandsince 2018. She has published around 15 papers inreputed journals in the field of luminescence materials and it’sapplications.
Amity University, India
An eye is a spherical structure that consists of three layers: the outer part, the middle section, and the iris. Behind the lens are the ciliary body and the nervous tissue layer retina.In the world, around 45 million people are blind and around 17.6 million are suffering from cataract. In India, around 20 lakh new cases are being added each year.Modern cataract surgeries are very safe and effective. They are performed with the intraocular lenses. One of the most popular techniques used in developing countries is small incisional cataract surgery.This procedure is commonly used for high-volume cataract surgery. It provides a good visual outcome and is less prone to complications.Conjunctival congestion lasts for about 5 to 7 days after cataract surgery. It is caused by the size of the incision, which is usually larger than the PHACO or microsurgical instrument.The procedure, which was first performed in 1967, is a combination of the chop method and the PHACO system. It's a safer, more effective method for minimizing bruising and improving the wound's stability.The procedure known as PHACO is not a practical option for treating hard cataracts due to its high risks of corneal damage and nuclear drop complications.In 2016, around 65.2 million people worldwide have cataracts. In Indonesia, it has been estimated that over a million individuals have visual impairment due to cataracts. The prevalence of the condition in the country has increased due to its tropical climate.Manual SICS is a commonly performed procedure for cataract patients who are not able to perform phacoemulsification due to unfavorable conditions. It is also less time-consuming and requires less maintenance. However, it has the same visual outcome as phacoemulsification.The objective of the study is to determine if improving the quality of life of patients through patient education and coaching can improve their conditions at a faster rate.
MATERIAL AND METHOD: This prospective observational study was carried out in the Department of Ophthalmology at Era University, Lucknow to evaluate the visual outcome in patients undergoing cataract surgery by two different methods. Total 3372 patients were enrolled in this study after fulfilling the inclusion and exclusion criteria and were divided into two groups according to the surgery they had undergone. Group A-1776 eyes undergone phacoemulsification and group B-1596 eyes operated by SICS method. Study protocol was approved by Institutional Review Board. Written informed consent was obtained from all the patients or patient’s relative. Patients with systemic diseases like diabetes (DM), hypertension (HTN), with posterior segment pathology, ARMD, retinal vascular diseases and patients with Glaucoma, history of trauma, uveitis and corneal opacity were excluded from the study.
RESULT: A total of 3372 cases were included in the study. Amongst the 3372 cases, 1714 were male; out of which 918 had undergone phacoemulsification and 796-SICS. 1658 cases were female; out of which 858 had undergone phacoemulsification and 800 SICS.Meanageofthecasesundergoingsurgerywas60.35±8.09years.Among 3372 participant 1776 went for phacoemulsification, out of them 863 (61.0%) got good visual outcome and 913 (39.0%) got poor visual outcome. 1596 patients underwent SICS, out of them only 522 (34.6%) got good outcome and 1044 (53.3%) got poor visual outcome.
Mrs. Ragni Kumari, born February 15, 1986, Gopalganj, Bihar, India. She completed her basic education in her village. She completed her Bachelor of clinical Optometry and Master of Clinical optometry from Bharati Vidyapeeth University, Pune and Amity University, Haryana, respectively. She also has post-graduation in MBA (Hospital Management and Supply Chain Management). She is pursuing Ph. D. in Public Health from Amity Institute of Public Health, Amity University, Noida, U.P. Presently she is working as an Optometrist in Lokbandhu Shree Rajnarayan Combined Hospital, Lucknow. She was former and founder HOD & Assist Professor, Department of Optometry, Era University, Lucknow. She was Assistant Proctor and member of anti-ranging committee of Era University. She is member of Society for Allied Health and health care professional’s education and research, Era University, Lucknow. Ragni Kumari has 15 years of clinical and academic experience. She is Ex. Sr. Consultant Optometrist in various organizations (Vision Express, AB Optique Pvt. Ltd, Lenskart.com). She organized many national and international conference in Era University and Amity University. She has Attended and presented papers in National /International Conferences and training programs. She Chaired Several National Scientific Conferences. Mrs. Ragni Kumari written more than 25 articles and Research Papers for National and International Journals of optometry and ophthalmology and Multidisciplinary Journals. She has been invited faculty in training programs and conducted many Workshops and training programs all over India. Mrs. Kumari has been invited as guest faculty in several conferences. She is member of Optometry council of India and International Contact Lens Educator, Australia. She is teaching the Contact lens, Indian Medicine & Telemedicine, Binocular Vision & Orthoptics, Dispensing Optics, Public Health for Diploma, UG and PG optometry students. She has several research interests subjects like contact lens, public health, Cataract, dispensing optics. She has published two books as co-author handbook of Ocular Terminology (Kavya Publication) and textbook of clinical optometry (Taurean Publication). She has written a book chapter in Challenges in eye care services and deliveries during COVID-19 pandemic”- An overview (Special Issue on Covid-19 by Ramaiah group of Educational Institution with collaborators; University of Illinois, U.S.A and University of Manitoba, Canada). These books are prescribed as Textbook in many Optometry Schools in India Besides this she has written chapters and articles in other books and Magazine. She is reviewer of journals, Acta Scientific Ophthalmology journal & International Journal of Creative Research Thought (IJCRT).
Beni-Suef University, Egypt
For sustainable water desalination, there is a worldwide push towards solar thermal desalination with the objective to limit the amount of consumed energy in other desalination technologies and maximize the resulting freshwater from saline water. Here, we demonstrate a photonic crystals solar umbrella that covers the saline water surface, demanding to absorb all the incident electromagnetic wave and remit it as greater wavelengths in the range of mid-infrared (MIR) to be highly absorbed and localized close to the water surface. The temperature of the saline water with a refractive index of 1.3326 is reached to
after one hour of illumination with the incident power intensity equal 680
. Hence, by adding one-dimensional PCs the surface temperature is reached
. Also, by adding 2D PCs to allow the vapor to flow up through the pores of the structure with the diameter of the pore equal to 500 nm, the surface temperature is reached
. Thus, the effective use of electromagnetic waves and warmth localization at the surface of saline water is accomplished by radiative coupling with the effect of 2D PCs. We design the considered structure by using COMSOL multiphysics which based on the finite element method (FEM).
Beni-Suef University, Egypt × Biography Arafa H Aly holds a doctoral degree in physics from University of Cairo , Beni-Suef branch, Egypt. Prof Arafa Aly joined Cairo University, Beni-Suef branch, physics department in Januaray 1995 as an assistant lectrurer of physics. He was a lecturer from 1999 to 2007, and associated profeesor from 2007 to 20012. In 2012 he became full professor in physics; In 2012 Professor Arafa was elected as the chair of the Department of Physics till now. Professor Arafa was a postdoctoral fellow of physics at seoul national university, South korea 2004 and 2005 in AUB,Lebanon. In 2006-2008 was a research professor in Chonnam national university in Korea. Within 2008 was a research professor in Zaragoza University in Spain. Also Prof Arafa was a research professor part time in Yousef Jameel Science and Technology Research Center AUC from 2009-2014. His area of specialty is mesoscopic systems, photonic crystals, phononic crystals, metamaterials. He has a distinguished 16-year career in mesoscopic systems, photonic crystals, phononic crystals, solar energy, materials and photonics research. He has published more than 170 technical papers and reports.
University of Jandouba, Tunisia
Machine learning (ML) is being heralded as a promising new path for future optical communication systems. Signal processing paradigms based on machine learning are being examined to address several crucial challenges in optical communications that are difficult to handle using traditional methods. Recent applications of machine learning in optical communications and networking have yielded promising results, including nonlinear transmission systems, network planning and performance prediction, cross-layer network optimizations for software-defined networks, and autonomous and reliable network operations. However, a fundamental knowledge of the nature of ML principles is required to grasp the real potential of ML in optical communications. This talk provides an overview of current machine learning
Sofien Mhatli is currently an assistant professor in telecommunications at ISI KEF and a Senior Researcher at the Ecole Polytechnique de Tunis, La Marsa, Tunisia, previously, he is working as a Telecommunications Engineer at the Ministry of National Defense, Tunis, Tunisia. His expertise is focused on designing and optimizing optical and microwave devices for applications in wireless telecom, sensing systems, and optical communication systems (SDH, WDM, PON, CO-OFDM, IM-DD...). His research interests include digital signal processing, algorithmic design (e.g., machine learning), and optical devices (e.g., MZM) for optical communications. The outcome of his research resulted in prestigious peer-reviewed journal papers and top conference presentations (e.g., OSA Optics Letters, OFC, IEEE Photonics Journal, ECOC). In the last 05 years, he is working as an international consultant for many companies in Tunisia and in France in the field of IT, security, virtualization and cloud training with many international references. The talk will be about machine learning applications in optical and wireless communications.
National Taiwan University, Taiwan
Overcoming the issue of the stability of tin-based perovskites is a major challenge for the commercial development of lead-free perovskite solar cells. To attack this problem, a new organic cation, azetidinium (AZ), is incorporated into the crystal structure of formamidinium tin triiodide (FASnI3) to form the mixed-cation perovskite AZxFA1-xSnI3. As AZ has a similar size to FA but a larger dipole moment, hybrid AZxFA1-xSnI3 films exhibit variation in optical and electronic properties on increasing the proportion of AZ. Trifluoromethylbenzene (CF3C6H5) serves as antisolvent to fabricate smooth and uniform perovskite films for the devices with an inverted planar heterojunction structure. The device performance is optimized to produce the greatest efficiency at x=0.15 (AZ15), for which a power conversion efficiency of 9.6 % is obtained when the unencapsulated AZ15 device is stored in air for 100 h. Moreover, the device retains 90 % of its initial efficiency for over 15 days. The significant performance and stability of this device reveal that the concept of mixed cations is a promising approach to stabilize tin-based perovskite solar cells for future commercialization.
Efat has completed her PhD from Sharif University, Iran.Currently, she is the postdoctoral at National Taiwan University. She has started working on perovskite as postdoctoral fellow in NYCTU since 2015 and worked on GO-based hole transport layer, low dimensional halide perovskite and tin-based perovskite solar cells.
Tel Aviv University, Israel
Handedness control in polarization lattice fields
by using spiral phase filters
Dr. Sushanta Kumar Pal has completed his PhD from Indian Institute of Technology Delhi, India. Currently, he is a postdoctoral fellow at Tel Aviv University, Israel. He has started working on polarization optics as a doctoral student at IIT Delhi since 2014. Currently he is working on focal shaping of singular beams, light matter interaction for generation and detection of various polarization singularities.
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