Prof. Kristiaan Neyts
Hong Kong University of Science and Technology, Hong Kong, China
The Hong Kong University of Science and Technology
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Academic Career Length
37Years (1990-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications1 April 1998 in Journal of the Optical Society of America A
Journal Article
Kristiaan NeytsOptics InfoBase is the Optical Society's online library for flagship journals, partnered and copublished journals, and recent proceedings from OSA conferences.
27 August 2018 in Nature Communications
Journal Article
KAKoen Alexander
Koen AlexanderJGJohn P. George
John P. George
JVJochem Verbist
Jochem VerbistKristiaan NeytsBKBart Kuyken
Bart Kuyken
JBJeroen Beeckman
Jeroen Beeckman +1
Silicon nitride (SiN) is emerging as a competitive platform for CMOS-compatible integrated photonics. However, active devices such as modulators are scarce and still lack in performance. Ideally, such a modulator should have a high bandwidth, good modulation efficiency, low loss, and cover a wide wavelength range. Here, we demonstrate the first electro-optic modulators based on ferroelectric lead zirconate titanate (PZT) films on SiN, in both the O-band and C-band. Bias-free operation, bandwidths beyond 33 GHz and data rates of 40 Gbps are shown, as well as low propagation losses (α ≈ 1 dB cm−1). A half-wave voltage-length product of 3.2 V cm is measured. Simulations indicate that further improvement is possible. This approach offers a much-anticipated route towards high-performance phase modulators on SiN.
1 August 2011 in Optical Engineering
Journal Article
JBJeroen Beeckman
Jeroen BeeckmanKristiaan NeytsPVPieter J. M. Vanbrabant
Pieter J. M. Vanbrabant
Liquid crystals are nowadays widely used in all types of display applications. However their unique electro-optic properties also make them a suitable material for nondisplay applications. We will focus on the use of liquid crystals in different photonic components: optical filters and switches, beam-steering devices, spatial light modulators, integrated devices based on optical waveguiding, lasers, and optical nonlinear components. Both the basic operating principles as well as the recent state-of-the art are discussed.
15 October 2003 in Journal of Applied Physics
Journal Article
HRH. Riel
H. Riel
SKS. Karg
S. Karg
TBT. Beierlein
T. Beierlein
WRW. Rieß
W. Rieß
Kristiaan NeytsThe emission characteristics of top-emitting organic light-emitting devices (OLEDs) have been studied experimentally and theoretically to derive a quantitative understanding of the effect of a dielectric capping layer. We demonstrated that the angular intensity distribution and the spectral characteristics can be tuned and the light outcoupling enhanced simply by varying the optical thickness of a dielectric layer deposited on top of a semitransparent metal electrode. With the capping-layer concept, the outcoupled light intensity in forward direction was increased by a factor of 1.7, and concomitantly a high color purity achieved. An optical model based on a classical approach was used to calculate the emission characteristics. The excellent agreement between measured and simulated data shows that the capping layer controls the interplay between different interference effects such as wide-angle and multiple-beam interference occurring in top-emitting OLEDs. The strength of the capping layer concept is in particular that the optical and the electrical device performance can be optimized separately.
25 May 2023 in Nature Communications
Journal Article
NSNerea Sebastián
Nerea SebastiánMLMatija Lovšin
Matija LovšinBBBrecht Berteloot
Brecht Berteloot
NONatan Osterman
Natan Osterman
APAndrej Petelin
Andrej Petelin
AMAlenka Mertelj
Alenka Mertelj +5
The recently discovered ferroelectric nematic liquids incorporate to the functional combination of fluidity, processability and anisotropic optical properties of nematic liquids, an astonishing range of physical properties derived from the phase polarity. Among them, the remarkably large values of second order optical susceptibility encourage to exploit these new materials for non-linear photonic applications. Here we show that photopatterning of the alignment layer can be used to structure polarization patterns. To do so, we take advantage of the flexoelectric effect and design splay structures that geometrically define the polarization direction. We demonstrate the creation of periodic polarization structures and the possibility of guiding polarization by embedding splay structures in uniform backgrounds. The demonstrated capabilities of polarization patterning, open a promising new route for the design of ferroelectric nematic based photonic structures and their exploitation.
23 April 2009 in Optics Express
Journal Article
SMSaso Mladenovski
Saso MladenovskiKristiaan NeytsDPDomagoj Pavicic
Domagoj Pavicic
AWAnsgar Werner
Ansgar Werner
CRCarsten Rothe
Carsten Rothe
Organic light emitting devices (OLEDs) are now used in commercial cell phones and flat screen displays, but may become even more successful in lighting applications, in which large area, high efficiency, long lifetime and low cost are essential. Due to the relatively high refractive index of the organic layers, conventional planar bottom emitting OLEDs have a low outcoupling efficiency. Various approaches for enhancing the optical outcoupling efficiency of bottom emitting OLEDs have been introduced in the literature. In this paper we demonstrate a green bottom emitting OLED with a record external quantum efficiency (42%) and luminous efficacy (183 lm/W). This OLED is based on a high index substrate and a thick electron transport layer (ETL) which uses electrical doping. The efficient light outcoupling is modeled by optical simulations.
About Me
Kristiaan Neyts is full professor at the Hong Kong University of Science and Technology (HKUST) in the Department of Electronic and Computer Engineering (ECE) and Director of the State Key Laboratory of Advanced Displays and Optoelectronics Technologies (SKLADT) since September 2023.
He received a degree in physics engineering in 1987, a doctoral degree in engineering in 1992 at Ghent University. For his master thesis he received the Barco Award and for his PhD the AIG Award at UGent. After post-docs at UC Berkeley and Ghent University, he became assistant professor in 2000 and full senior professor in 2012. He is co-author of over 300 papers in the Web of Science, promotor or co-promotor of 31 completed PhDs and co-inventor of 10 granted patents. He founded the Liquid Crystals and Photonics Group (LCP) at UGent which has 5 professors, 3 post-docs and 15 PhD students. He was co-founder of the Center for Nano- and Bio-Photonics, a UGent sponsored Multi-disciplinary Research Network. He was conference chair of international conferences: EL2002, WLCP 2006, ELOPTO2012, Eurodisplay 2015, Eurodisplay 2019. Recently the group has received three Facebook Reality Labs Liquid Crystal research awards: Diamond award for Inge Nys in 2020, Gold award for Migle Stebryte in 2021, and Gold award for Brecht Berteloot in 2022.