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E u r o S c i C o n C o n f e r e n c e o n
Nanotechnology &
Smart Materials
Nano Research & Applications
ISSN 2471-9838
O c t o b e r 0 4 - 0 6 , 2 0 1 8
Am s t e r d a m , N e t h e r l a n d s
Nanotechnology & Smart Materials 2018
Page 77
Optical surface waves are guided light on surface of optical structures. There
are several optical structures that support optical surface waves, such as
nanostructures, gratings, optical waveguides and metamaterials. Optical surface
waves have proven themselves very promising candidates for several applications
including biosensing, optical computing and optical circuitry. The characteristics
of surface wave can be characterised by the wave vector (k-vector) of the surface
wave. In this talk, we will discuss how a modified confocal microscope integrated
with a phase spatial light modulator allows us to measure both the real part and
the imaginary part (attenuation coefficient) of the surface wave k-vector. Surface
plasmon resonance (SPR) excited on a uniformgold surface through Kretschmann
configuration is employed as an example in this talk. Note that the system is not
limited to the SPR. It is also applicable to other types of optical surface waves.
We have demonstrated in our recent publication that the modified confocal not
only provides the k-vector measurement both real and imaginary, it also allows
us to separate different loss mechanisms in SPR. One limitation of the system
was the single point detection. Here, we will discuss the current stage of our
development in widefield confocal surface plasmon microscope, which allows us
to measure multiple points simultaneously. This has been achieved by integrating
another amplitude spatial light modulator in the image plane of the objective lens
allowing the image plane to be sequentially coded and post-processed to recover
the confocal image.
Biography
Suejit Pechprasarn has received his B Engg degree in Elec-
tronic and Computer Engineering (1st class Honour) from the
University of Nottingham in the UK and Electrical Engineering
degree from Thammasat University in Thailand in 2007. He
then commenced his Doctorate degree study at the Institute of
Biophysics, Imaging and Optical Science (IBIOS), the University
of Nottingham in the UK and received his PhD in 2012. He was
appointed as a Postdoctoral Research Fellow at the Institute for
two years before joining the Hong Kong Polytechnic University
in Hong Kong SAR in 2014 as a Research Fellow until the pres-
ent. Since Dec’ 2014, he has also been working as an Invited
Guest Lecturer and Associate Dean for Research, Innovation
and Foreign Affairs at Rangsit University, Thailand. He has re-
cently been appointed as Assistant Professor at Shenzhen Uni-
versity in China.
Widefield confocal microscope for surface
wave k-vector measurement
Suejit Pechprasarn
Rangsit University, Thailand
Suejit Pechprasarn, Nano Res Appl Volume:4
DOI: 10.21767/2471-9838-C6-024