Photonics Technology Laboratory

Thailand, Thailand

Photonics Technology Laboratory

Thailand, Thailand
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Somarapalli M.,Bangkok University | Mohammed W.S.,Bangkok University | Viphavakit C.,City University London | Boonruang S.,Photonics Technology Laboratory
2016 13th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON 2016 | Year: 2016

Here we propose the fabrication of integrated Ormocomp polymer optical waveguide. The characterization bench is developed using a simple PDMS lens for light coupling and low cost optical microscope for capturing the decoupled light from the waveguide. And the mechanical alignment is provided with a 3D design prototype. The observed results were compared with the traditional characterization bench and observed the magnification up to 10 ×. © 2016 IEEE.

Viphavakit C.,Asian Institute of Technology | Viphavakit C.,Frederick University | Themistos C.,Frederick University | Komodromos M.,Frederick University | And 3 more authors.
Journal of Circuits, Systems and Computers | Year: 2013

The design, fabrication and characterization of an optics based integrated flow rate sensor is presented where the light-fluid interaction is maximized by allowing the liquid and light to propagate along the same direction. The flow rate sensor consists of a 10 μm deep microchannel placed between two waveguides. The optical waveguides were tapered to fit the channel width, to guide light in and out of the microchannel. A tapering mechanism is proposed to minimize the coupling and propagation losses. The power of the output signal from the designed device was calculate through simulation and it was compared with the actual output signal detected by a fast receiver (higher than 1 MHz). The dynamic change of the light intensity when fluid flows through the channel can also be recorded by this receiver. This scheme allows for a direct measurement of the liquid flow rate with higher interaction length between fluid and light with a dynamic range of up to 0.18. An integrated microfluidic device with high precision and sufficient coupling between the light source and the microfluidic channel is proposed. © 2013 World Scientific Publishing Company.

Ohulchanskyy T.Y.,State University of New York at Buffalo | Kopwitthaya A.,State University of New York at Buffalo | Kopwitthaya A.,Photonics Technology Laboratory | Jeon M.,State University of New York at Buffalo | And 8 more authors.
Nanomedicine: Nanotechnology, Biology, and Medicine | Year: 2013

We present a magnetoplasmonic nanoplatform combining gold nanorods (GNR) and iron-oxide nanoparticles within phospholipid-based polymeric nanomicelles (PGRFe). The gold nanorods exhibit plasmon resonance absorbance at near infrared wavelengths to enable photoacoustic imaging and photothermal therapy, while the Fe3O4 nanoparticles enable magnetophoretic control of the nanoformulation. The fabricated nanoformulation can be directed and concentrated by an external magnetic field, which provides enhancement of a photoacoustic signal. Application of an external field also leads to enhanced uptake of the magnetoplasmonic formulation by cancer cells in vitro. Under laser irradiation at the wavelength of the GNR absorption peak, the PGRFe formulation efficiently generates plasmonic nanobubbles within cancer cells, as visualized by confocal microscopy, causing cell destruction. The combined magnetic and plasmonic functionalities of the nanoplatform enable magnetic field-directed, imaging-guided, enhanced photo-induced cancer therapy. From the Clinical Editor: In this study, a nano-formulation of gold nanorods and iron oxide nanoparticles is presented using a phospholipid micelle-based delivery system for magnetic field-directed and imaging-guided photo-induced cancer therapy. The gold nanorods enable photoacoustic imaging and photothermal therapy, while the Fe3O4 nanoparticles enable magnetophoretic control of the formulation. This and similar systems could enable more precise and efficient cancer therapy, hopefully in the near future, after additional testing. © 2013 Elsevier Inc.

Nuntawong N.,Photonics Technology Laboratory | Horprathum M.,Photonics Technology Laboratory | Eiamchai P.,Photonics Technology Laboratory | Wong-Ek K.,Chulalongkorn University | And 2 more authors.
Vacuum | Year: 2010

In this report, we describe a fabrication process of low-cost and highly sensitive SERS substrates by using a simple anodizing setup and a low-energy magnetron sputtering method. The structure of the SERS substrates consists of silver nanoparticles deposited on a layer of anodic aluminum oxide (AAO) template. The fabricated SERS substrates are investigated by a scanning electron microscope (SEM), a transmission electron microscope (TEM), and a confocal Raman spectroscope. We have verified from the surface morphology that the fabricated SERS substrates consist of high-density round-shape silver nanoparticles where their size distribution ranges from 10 to 30 nm on the top and the bottom of nanopores. The surface-enhanced Raman scattering activities of these nanostructures are demonstrated using methylene blue (MB) as probing molecules. The detection limit of 10 -8 M can be achieved from this SERS substrate. © 2010 Elsevier Ltd. All rights reserved.

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