EINST TECHNOLOGY PTE LTD




EINST TECHNOLOGY PTE LTD

TECHNOLOGY

APPLICATIONS

Optical Micromanipulation System

Abstract - A focused laser beam (using high numerical aperture objectives) provides enough optical force (in the order of piconewton) to physically hold and move microscopic dielectric objects in aqueous medium. These forces has been used to study a variety of biological systems. It is commonly known as an Optical Tweezers.

Areas: Optical Physics, DNA Mechanics, Cell mechanics

Scanning Laser Microscope System

Abstract - There are many different ways in which beam-steering can be achieved such as using Galvanometer scanning mirror, piezoelectric scanning mirrors, electro-optic deflector and acousto-optic deflector/modulator. The beam steering process is done through the housing of a scan head. The beam steering system has a couple of direct applications on laser technology machines (laser engraving, annealing, marking, cutting, welding), optical communication systems for to stabilize laser beam over large distances, adaptive optics systems for tip and tilt distortions compensation, laser scanning and display devices, confocal microscopy system and optical tweezing applications.

Areas: Laser scanning system, confocal microscopy

Spectroscopy

Abstract:- Spectrometers enables the use in a very wide variety of sensing and sensor applications, such as: Measuring survival of microorganism’s population after high UV pulsed light emission, UV Absorption of the skin in correlation with UV protection of digested carotenoids. Determination of penetration of chemicals through the skin into the blood stream. Measure water content of fruits and soluble solids. Energy spectrum of light sources and analysis of chemical compounds in organic chemicals.

Areas: Biotechnology, Dermatology, Food Technology, Optical Filters, Radiometry, Raman Spectroscopy

Low Coherence Optical Interferometry

Abstract:- Optical Interferometers use interference between light waves to make accurate measurements. It is the interaction of two of more light waves yielding a resultant irradiance I that deviates from the sum of the component irradiance. For large spectral bandwidth, the coherence length LC, high contrast fringes will be observed only when the two path lengths of the interferometer arms are matched in length, i.e. zero path length difference. This type of interferometry is known as low coherence interferometry (LCI), and one application that is based on this theory is Optical Coherence Tomography (OCT). Optical coherence tomography (OCT) is a method for non-invasive optical tomography, subsurface imaging of biological tissue with sub-micrometer axial and lateral resolution by measuring the time-of-flight delay and the intensity of backscattered or backreflected light from the sample under measurement in situ and in real time.

Areas: Interferometry, Optical coherence tomography

PRESENTATION SLIDES

Basic Optical Theory

Abstract- This set of presentation slides provides an elementary view of basic optics such as lens theory and numerical aperature

Basic Microscopy

Abstract- The set of presentation is complied to provide the reader a basic understanding modern optical microscopy

Advanced Bright-Field Microscopy Imaging

Abstract- The set of presentation is complied to provide the reader a basic understanding advance contrast imaging in modern optical microscopy

JOURNAL PUBLICATION WITH SUPPORT FROM EINST TECHNOLOGY

Optical tweezers

1.
"Interference from multiple trapped colloids in an optical vortex beam"
W.M.Lee, V. Garcés-Chávez, and K.Dholakia Opt. Express 14, 7436-7446 (2006) (link)

"Far field interference measurements of vortex light fields in optical trapping" Complex Light and Optical Forces
W. M. Lee; A. E. Carruthers; V. Garcés-Chávez; K. Dholakia, Edited by Andrews, David L.; Galvez, Enrique J.; Nienhuis, Gerard. Proceedings of the SPIE, Volume 6483, pp. 64830N (2007).(link)

"Optically trapped and controlled micro-apertures for studies of spatial coherence in an arbitrary light field"
W.M.Lee and K.Dholakia, Appl Phys Lett 2007 (In Press)

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