reconstruction from a single hologram of yeast cells recorded by the
holographic microscope. 3D information is calculated from
the phase image.
3D reconstruction from a single hologram recorded by the holographic endoscope. Here a stereo view is obtained
from a single hologram and disparity map is calculated. Then the 3D depth map is combined with the actual 2D image.
STATIC FOURIER TRANSFORM SPECTROMETER WITH BAND PASS SAMPLING...
A unique hybrid optical spectrometer. Here we take advantage of band pass sampling theorem to get away with the Nyquist sampling
WAVE DETECTION WITH RECTENNAS
is one of my latest projects. Currently we are investigating 3D imaging
of objects in transmissive or
reflective configuration. Holograms are recorded on a CCD camera and
the image is
created on the computer.
Various signal processing algorithms for increasing the image
quality are explored as well as the
methods to visualize the objects in 3D.
important applications we are considering are:
3D imaging of tissues that we call "holographic optical coherence
tomography", and imaging of vibrating objects
coupled with a microphone array for
locating the sound source.
Here is some of the publications
related to this work:
“Method to calculate the far field
of three-dimensional objects for computer-generated holography”, Muharrem
Bayraktar and Meriç Özcan
Opt., Vol. 49, Issue 24, pp. 4647-4654 (2010)
recording without a separate reference wave”, Meriç
SPIE 7619 76190K (2010)
holography image reconstruction methods”, Meriç
Muharrem Bayraktar Proc.
"A new method for computer generated
holography of 3D objects", Muharrem
International Symposium on Computer and Information Sciences, 2009
(ISCIS 2009), IEEE
(Institute of Electrical and Electronics Engineers), Sep. 2009, 66-69
method for generating artificial holograms",
European Optical Society Topical Meeting on Advanced Imaging
Germany, June 2009.
and acoustic optimization of door modulus for radiated noise
4044 (2007) "Hilbert
dönüşümü tabanlı hologram filtreleme", Muharrrem
Bayraktar and Meriç Özcan, SIU
2010, Diyarbakır, Nisan 2010.
interferometri kullanarak yüzey sapmalarının incelenmesi", Muharrrem
Bayraktar and Meriç Özcan, ELECO'08,
Bursa, 26-30 Kasım, 2008. MATTER
HOW TO MAKE BETTER ATOMIC GYROSCOPES...
effect is a rotationally induced phase shift between two paths of an
interferometer. Gyroscopes based
on this effect measure a rotation rate relative to an inertial frame of
reference. Sagnac effect was originally derived
and experimentally shown first with light waves. However, in
recent years matter wave interferometers which use atoms
became important as matter wave interferometers are inherently much
In 1998 I figured out that it is possible to make atomic gyroscopes
even better by
using a weird quantum effect known as Aharonov-Bohm effect which says
a physical effect of potentials even though there is no actual force is
ever acted on
"Influence of electric
on atom interferometers: Increased rotation sensitivity",
M. Özcan, J.
Appl. Phys., 83, 6185-6186, 1998.
Since then this continued to be my pet project as I am fascinated with
Sagnac effect and its close ties to
a Sagnac interferometer the medium in which the wave travels does not
affect the phase shift
against the common sense. So using a slower wave does not
increase the sensitivity!
However, my interferometer has another benefit: Unlike a Sagnac
interferometer it's sensitivity improves with slower waves!
This might have some other implications as well which I am currently
Here is the Photonics
West 2006 presentation
and the paper is published as
Sensing with Atom Interferometers using Aharonov-Bohm Effect",
M. Özcan, Proc.
SPIE, San Jose, CA, Feb 2006.
and later... “Slow wave atom
interferometers for rotation sensing”,
SPIE 6482 64820V (2007)
Optik ve Atom Dalgaları İle Hassas Rotasyon
Ölçümü" (Invited Talk) Meriç
EEBBM Ulusal Kongresi, Eskisehir, 12-14 Kasım, 2007. SURFACE
PLASMON RESONANCE BASED SENSORS
plasmon resonance (SPR) is a ligth induced collective oscillations of
electrons in a thin film of a metal. There has been numerous
applications of this phenomenon including bio-sensing and chemical
sensing. In addition to the sensor development, we explore
the increased photoluminescence due to SPR enhanced evanescent waves.
We also showed that SPR can be used as a highly sensitive
optical microphone or pressure sensor.
"High Sensitivity Displacement
Sensing with Surface Plasmon Resonance",
M. Özcan, Proc.
SPIE, San Diego, CA, Aug 2005.
BAND (UWB) WALL
actually built the prototype of the radar...You can read
some more here...
“Moving target detection using super-resolution algorithms with
an ultra wideband radar”,
Engin and Meriç Özcan, Int.
J. Imaging Syst. Technol. Vol.20, No:3, pages 237–244, 2010
High Resolution Ultra wideband Wall Penetrating Radar”, Erman
Engin, Berkehan Çiftçioğlu, Meriç Özcan and
İbrahim Tekin, Microwave
Opt. Technol. Lett. Vol. 49, No. 2, 2007 A NOVEL
We eplore the
manipulation of small particles non-invasively by using a focused laser
beam. Our unique configuration allows us
to use very low laser powers hence tweezing action
can be performed on live cells without causing any
damage to them. Computer generated arbitrary
trapping paths and time-shared trapping patterns
are successfully demonstrated. Currently we are
exploring evanescent wave structures for
manipulating nanometer size particles.
presentation of our
and this work is published
compact, automated and long working distance optical tweezer system",
M. Ozcan, C. Onal, A. Akatay, J.
Mod. Opt., 53,
crystals are artificially created periodic structures that modify the
propagation of electromagnetic waves.
In our unique setup we showed
that it can be used as a highly sensitive refractive index sensor,
orders of magnitude
better than the existing systems. This
system can be expanded to other sensor systems as well.
a US patent is
more info later...Atilla Ozgur Cakmak worked on this for his Master's
we are working on Sonic Crystals in which we solve
wave equations instead of Maxwell's.
Of course now we have to use acoustic
waves in the experiments instead of electromagnetic waves or
Engin is working on the project for his Master's Thesis.
WIDE BANDWIDTH MICROSTRIP-SLOT
was Aylin Eksim's master thesis work...We actually come up with
some neat antenna designs that worked
from 3 to 11 GHz range! We used a
few of these antennas in our UWB radar system actually...Never found
the time to write
something about them...