Day 2 :
Florida International University USA
Keynote: Bio-Nanoparticles: Determining fundamental physical properties and bio-medical applications through laser induced pressure and cavitation
Time : 11:00-11:40
Professor Bernard S. Gerstman is Chairman of the Department of Physics at Florida International University, and Executive Editor of the journal American Institute of Physics Advances. Professor Gerstman received his Ph.D. in Physics from Princeton University, and then obtained a position as a Post-Doctoral Researcher in the Physics Department at the University of Virginia. After finishing his post-doctoral work, Prof. Gerstman accepted a tenure-track position in the Department of Physics at Florida International University where he has risen through the ranks based upon his research and teaching accomplishments. Professor Gerstman’s research interests have focused on the physics of biomolecules, nanomaterials, and biological cells. The use of lasers to investigate and alter the properties of these materials has been an integral part of his research. Professor Gerstman has also been a consultant to the United States Air Force and the British Ministry of Defense.
Laser energy absorbed by nanoparticles is transduced into different thermo-mechanical channels: heat, explosive vaporization, and shock fronts. The underlying physics involves non-linear effects and displays complex dependencies on thermos-mechanical properties. For nanoparticles, sub-picosecond laser pulses can be used to tune the energy transduction into the different physical channels. This tuning of the physics of the response can be used to measure fundamental thermo-mechanical properties of nanoparticles. Once the thermo-mechanical properties of a nanoparticle are known, the nanoparticle can be used as a means to transduce laser energy to introduce various forms of stimuli on the surrounding material, such as intense heating, explosive vaporization, or generation of shock-waves. The thermo-mechanical stimuli can be tailored to produce desired outcomes in the surrounding material, such as microscopic annealing, localized chemical reactions, fracturing, and biological cell-death. The nanoparticles in the material can either be naturally occurring such as melanosomes in biological cells, or introduced such as gold or graphite nanoparticles.
- Track 3: Nanophotonics Track 4: Biophotonics Track 8: Laser in Medicine Track 10 : Applications of Photonics
Bernard S. Gerstman
Florida International University, USA
Ecole Polytechnqie Federale de Lausanne, Switzerland
Time : 11:40-12:20
Pramod Rastogi is the author of more than 150 scientific papers published in peer-reviewed archival journals, and has edited eight books. He is a Fellow of the Optical Society of America and a Fellow of the Society of the Photo-Optical Instrumentation Engineers. He is a recipient of the “Hetényi Award” for the most significant research paper published in Experimental Mechanics in the year 1982; a recipient of the SPIE Dennis Gabor Award in the year 2014, and is a member of the Swiss Academy of Engineering Sciences. He is the Editor-in-Chief of the International journal of Optics and Lasers in Engineering, Elsevier.
This talk reviews high resolution phase shifting methods which have the capability of accommodating the requirements inherent in multiple beam holographic interferometry. These methods facilitate the use of multiple PZTs in an optical setup, offer the flexibility of using arbitrary phase steps and spherical beams, and provide the ability of making simultaneous multidimensional deformation measurements. The main sources of errors in implementing phase stepping are caused by the miscalibration of the piezo electric device (PZT) and by the presence of non-sinusoidal waveforms (consequence of CCD nonlinearity or multiple reflections inside the laser cavity). The proposed phase stepping methods render the holography related interferometry techniques insensitive to the error sources mentioned above. Experimental results show the feasibility of the proposed methods.
Purdue University, USA
Time : 12:20-12:40
Huisung Kim, received his B.S. from Hongik University in Korea and M.S. from Gwangju Institute of Science and Technology (GIST) in Korea. His current research is on bacteria detection using optical light scattering technique. Before he joins Purdue University in USA, he worked at GIST on development of fiber type confocal microscope module for integrated microscope. His research interest involves laser applications via light scattering for biological samples, mechanical and optical design / control, signal analysis, and instrumentation.
A forward scattering pattern analysis based bacterial phenotyping, named BARDOT (BActerial Rapid Detection using optical technique), was developed and showed good classification ratio for several bacterial species such as Vibrio, Listeria, Salmonella, and E. coli. Here, a bacterial colony is considered as an optical modulator, and it renders an incoming plane wavefront to form a forward scattering patterns based on elastic light scattering principle. Since both the macroscopic colony profile and inner optical characteristics of the colony contribute to the pattern, coordinate-matched measurements of the bacterial colony such as morphology, optical density(OD), and the scattering patterns are essential for comprehensive understanding of the bacterial colony. We present a newly designed multimodal BARDOT, which can measure morphology, OD, and scattering patterns of the bacterial colony, utilizing single wavelength (635nm) forward scatterometer with confocal microscope based bacterial colony morphology analyzer. Feasibility test was done for the proposed instrument by comparing the theoretical prediction and experimental forward scattering pattern, and showed promising result.
Purdue University, USA
Time : 12:40-13:00
Iyll-Joon Doh is a graduate student in Mechanical Engineering Department at Purdue University pursuing master's degree. He received Bachelor's degree of science in Mechanical Engineering at Purdue University in 2013. His current research is on glucose detection via light scattering method. The research interest involves in mechanical and electrical design, precision control, and laser applications in bio-medical areas.
We report a design of a portable confocal Raman spectroscopy modulefor sample identification and quantification. Aneconomic laser diode (780nm) and a narrow band pass filter (785nm) located at rotational stage were integrated in a modular format. A dichroic shortpass mirror (805nm), an OD 5 long pass filter (800nm), and an objective lens are installed to split elastic scatteringand Raman scattering photons from the specimen. Utilizing a single modefiber opticwith a collimator and the objective lens, confocal-like signal is captured to reject information from theout-of-focus sections which allowsa chemical optical sectioning of the sample.For validation and characterization, we have used glucose solution with several concentration, and two different glucose concentration solutions on a plate glass separated by a covered glass. The feasibility test showed a promising result to quantify the sample, and optical sectioning with proposed confocal Raman spectroscopy.
Maulana Azad Institute of Dental Sciences, India
Time : 14:00-14:40
Background: Standard Surgical treatment in Oral &Maxillofacial surgeries for various hard and soft tissue lesion using scalpel, chisel mallet and bone cutting burs are accompanied by fear and pain for the patient. Although pain may be reduced by local anaesthesia, fear of the needle and suture placement remains a cause of discomfort. ErCrYSGG a hard and soft tissue laser is a rising treatment option which can provide more comfortable alternative or adjunctive method to conventional surgeries. Aim : The purpose of this study was to evaluate the use of ErCrYSGG laser in the field of Oral & Maxillofacial Surgery. Methodology: In a clinical trial around 100 patient requiring minor surgical procedures for pre-prosthetic purpose ( mandibular tori, vestibuloplasty, gingival hyperplasia), orthodontic purpose(exposure of orthodontic band, frenectomy, tongue tie), precancerous lesions(OSMF, hyperkeratotic patch), benign lesions(fibroma, peripheral ossifying fibroma), salivary gland disorders( ranula, sialolithotomy), incisional and excisional biopsy, disinfection of wounds were treated using ErCrYSGG laser. They were evaluated on the basis of post operative pain, healing, patients comfort, recurrence, functional and aesthetic outcome. Result: All the patients were successfully managed showing advantages of bloodless surgical field, no post operative pain, relative speed and ease of execution. Conclusion: ErCrYSGG laser has proved to be an effective and alternative tool in the hands of surgeons providing good aesthetic and functional results in lesser time.
Koyama Research Group on Distance measurement, Japan
Time : 14:40-15:20
Naoyuki Koyama has completed his PhD at the age of 30 years from Tokyo University. He joined NISSAN MOTOR CO., LTD AEROSPACE DIVISION, engaged in developing instruments for quality assurance. He retired from the company at 2010.
When two laser beams of different wavelength are simultaneously applied to a Michelson interferometer, complicated variation in interference intensity occurs due to the difference in optical path length between the reference beam and the measuring beam. The frequency and wavelength of laser a are νa and λa respectively, and similarly the frequency and wavelength of laser b are νb and λb. Because νa and νb are irrational numbers, not integers, in a strict sense the same intensity variation of the interference does not reappear. In a practical sense, however, the ratio νa:νb can reduce to a simple ratio of whole numbers m:n, and intensity variation from optical path length differences occur periodically. The corresponding period of the optical path length difference is mλa (=nλb). Step height can be measured within half of mλa (=nλb) with measuring error on the order of nanometers. A measuring instrument based on this idea is proposed, and also propose that how optical axes of two-wavelength semiconductor laser coincide with each other by prism.
- Workshop: Spectroscopy in Archealogy 15:20-16:10
- Coffee break 16:10-16:[email protected]
- Poster [email protected] North16:10-16:40