lantian-chang

-Short Biography

In 2004 Lantian started his undergraduate program, applied physics, in Shandong Normal University, China. After finishing the bachelor in 2008 he decided to focus on Optics. He pursued his master’s studies in University of Twente (2009-2011) follows the optical track in applied physics. He did his master thesis in Laser Physics and Nonlinear Optics group (LPNO). His master project was to build a continuous wave Optical Parametric Oscillator (OPO) and use that OPO to do absorption spectroscopy of H2 fundamental quadrupole transitions. During his master he grew more and more interest to optical engineering. He started his first half PhD (2011-2013) in Integrated Optical Microsystem group (IOMS) in University of Twente. In 2013 he joined the Nanobiophysics group for his second half PhD. He is currently doing research to develop a Low-cost handheld optical coherence tomography (OCT) system by using integrate optical waveguide technology.

-Contact Information -

Lantian Chang (MSc)

Nanobiophysics

University of Twente

Institute for Nanotechnology MESA+

Zuidhorst ZH153

Drienerlolaan 5

7522 NB  Enschede, the Netherlands

PO-box 217

7500AE Enschede, the Netherlands

P +31-(0)53-489-3163

F +31-(0)53-489-2150


l.chang@utwente.nl

-Own Research in NBP-

TOPIC: Development of a Low-cost handheld optical coherence tomography (OCT) system by using integrate optical waveguide technology

Optical coherence tomography (OCT) is an optical signal acquisition and processing technique which can provide three dimensional images of tissue with micrometer-resolution. The measurement principle of OCT is based on low-coherence interferometry (LCI) in which interference patterns due to the superposition of a multitude of waves with a large spread in wavelength is studied. These distinctive patterns enable one to determine the location at which light is reflected back and to measure the depth profile of the scattering amplitude. By performing multiple LCI measurements at different lateral coordinates on a sample, a three-dimensional cross-sectional image of the scattering amplitude can be constructed.

In this project we design, fabricate and characterize on-chip integrated optical elements (such as microlenses and optical waveguide based power splitters) to replace traditional bulky optical elements (such as mirrors and cube or fiber beam splitters) in the OCT system. This will not only bring down the size and cost compare to the traditional OCT system, but also improve the stability of this interference based system. By using integrated optics we also have the advantage to fabricate parallel OCT system on a single chip. This could lead to a faster imaging speed or even new applications.

In this IOP project we have close collaboration with AMC, LioniX, 2M Sensors, and Oclaro.

Publications of interest

(Means publications that either describe your work or your own)

1.

Akça, B.I. and Povazay, B. and Chang, Lantian and Alex, A. and Wörhoff, K. and de Ridder, R.M. and Drexler, W. and Pollnau, M. (2013Advanced integrated spectrometer designs for miniaturized optical coherence tomography systems. In: Optical Coherence Tomography and Coherence Techniques VI12-16 May 2013Munich, Germanypp. 1-6.Proceedings of the SPIE 8802 (880202). SPIE.

2.

Chang, Lantian and Ismail, N. and de Ridder, R.M. and Pollnau, M. and Wörhoff, K. (2013Integrated polymer microlenses for two-dimensional collimation of light from single-mode optical waveguides. In: Conference on Lasers and Electro-Optics, CLEO/Europe 201312-16 May 2013Munich, GermanyPaper CK-10.6Online Conference DigestEuropean Physical Society. ISBN 978-1-4799-0594-2

3.

Akça, B.I. and Chang, Lantian and Sengo, G. and Wörhoff, K. and Pollnau, M. and de Ridder, R.M. and Nguyen, V. Duc and Kalkman, J. and van Leeuwen, T.G. (2012Integrated AWG spectrometer for on-chip optical coherence tomography. In: 16th European Conference on Integrated Optics, ECIO 201218-20 Apr 2012Sitges/Barcelona, SpainPaper 46.Insitut de Ciències Fotòniques.

4.

Akça, B.I. and Chang, Lantian and Sengo, G. and Wörhoff, K. and de Ridder, R.M. and Pollnau, M. (2012Polarization-independent enhanced-resolution arrayed-waveguide grating used in spectral-domain optical low-coherence reflectometry. IEEE photonics technology letters24 (10). pp. 848-850. ISSN 1041-1135 *** ISI Impact 2,04 ***

5.

Akça, B.I. and Ismail, N. and Chang, Lantian and Wörhoff, K. and de Ridder, R.M. and Pollnau, M. (2012Towards Raman spectroscopy on a microchip. (Invited) In: Scientific Exchange 2012 (SCIX)29 Sept-04 Oct 2012Kansas City, USAIEEE Aerospace and Electronic Systems Society.

6.

Chang, Lantian and Akça, B.I. and Sengo, G. and Wörhoff, K. and de Ridder, R.M. and Pollnau, M. (2012Polarization-independent optical low-coherence reflectometry with a non-birefringent arrayed-waveguide grating. In: 16th European Conference on Integrated Optics, ECIO 201218-20 Apr 2012Sitges/Barcelona, SpainPaper 169Insitut de Ciències Fotòniques.

7.

Chang, Lantian and Akça, B.I. and Sengo, G. and Wörhoff, K. and de Ridder, R.M. and Pollnau, M. (2012High-performance spectral-domain optical low-coherence reflectometry with an integrated arrayed-waveguide grating. In: Conference on Lasers and Electro-Optics: Science and Innovations (CLEO: S and I)6-11 May 2012San José, California, USA.Paper JTh2A.34Optical Society of America. ISBN 978-1-55752-943-5

8.

Chang, Lantian and Ismail, N. and de Ridder, R.M. and Pollnau, M. and Wörhoff, K. (2012On-chip reflowed polymer microlenses for collimating light from single-mode optical waveguides. In: 17th Annual Symposium of the IEEE Photonics Benelux Chapter29-30 Nov 2012Mons, Belgiumpp. 243-246Faculty of Engineering, University of Mons. ISBN978-2-8052-0184-4

9.

Ismail, N. and Chang, Lantian and Sengo, G. and de Ridder, R.M. and Pollnau, M. and Wörhoff, K. (2012Polymer microlenses for collimating light from single-mode silicon oxynitride optical waveguides. In: 16th European Conference on Integrated Optics, ECIO 201218-20 Apr 2012Sitges/Barcelona, SpainPaper 188Insitut de Ciències Fotòniques

10.

Chang, Lantian and Akça, B.I. and de Ridder, R.M. and Wörhoff, K. and Pollnau, M. (2011Performance Improvement and Birefringence Investigation of Spectral Domain Optical Coherence Tomography Using a Modified Arrayed Waveguide Grating. In: Proceedings of the 2011 Annual Symposium of the IEEE Photonics Benelux Chapter1-2 December 2011,Ghent, Belgiumpp. 241-244Benelux ChapterDepartment of Information Technology, Ghent University. ISBN 978-90-76546-00-1