PolyU Institutional Repository
The PolyU IR collects, makes available, showcases, preserves and enhances the discovery of the research and scholarly output created by the PolyU community.
Journal articles, conference papers and presentations, technical reports, theses and dissertations, drawings, maps, datasets, images, videos and any other digital objects can be stored here. Deposited materials will be preserved and made available on the web.
Starting from September 2010,
PolyU Adopts Open Access Policy in Support of Open and Unrestricted Access to Published Research.
Expertise dissimilarity and creativity : the contingent roles of tacit and explicit knowledge sharing
In this study, we investigated whether team-level knowledge sharing moderates the effects of individual-level expertise dissimilarity on individual employees’ creativity in research and development...
Directional single-mode emission from coupled whispering gallery resonators realized by using ZnS microbelts
Ring microcavities were formed by wrapping ZnS microbelts, which act as the waveguide and gain region of the microcavities on the surface of optical fibers. The ring microcavities with the formatio...
Embedded coupler based on selectively infiltrated photonic crystal fiber for strain measurement
A photonic crystal fiber (PCF) with embedded coupler is demonstrated for strain measurement. The embedded coupler is constructed by the selective filling of one of the air holes in the PCF. Light p...
Femtosecond laser fabricated micro Mach-Zehnder interferometer with Pd film as sensing materials for hydrogen sensing
In this paper, a femtosecond laser fabricated fiber inline micro Mach-Zehnder interferometer with deposited palladium film for hydrogen sensing is presented. Simulation results show that the transm...
High-resolution optical spectrum characterization using optical channel estimation and spectrum stitching technique
A technique is proposed to measure the high-resolution and wide-band characterization of amplitude, phase responses, and polarization property of optical components. This technique combines the opt...
Microfiber in-line Mach–Zehnder interferometer for strain sensing
An elegant way of achieving an ultracompact optical fiber in-line Mach–Zehnder interferometer is to create an inner air cavity in a section of microfiber. The sandwich structure splits the light pr...
Miniature fiber-tip photoacoustic spectrometer for trace gas detection
We demonstrate a fiber-tip photoacoustic spectrometric sensor for trace gas detection. The sensor head is a miniature fiber-tip hollow-cavity with a deflectable polymer diaphragm. Periodic light ab...
Miniaturized fiber in-line Mach–Zehnder interferometer based on inner air cavity for high-temperature sensing
We demonstrate a miniaturized fiber in-line Mach–Zehnder interferometer based on an inner air cavity adjacent to the fiber core for high-temperature sensing. The inner air cavity is fabricated by f...
Polarization-maintaining fiber-optic-grating vector vibroscope
A fiber-optic vector vibroscope based on orthogonal polarization cladding-to-core recoupling is demonstrated. A compact structure in which a short section of polarization-maintained (PM) fiber stub...
Suspended core photonic microcells for sensing and device applications
In-line fiber-optic microcells are fabricated by postprocessing NKT LMA10 photonic crystal fibers. The cells are suspended core (SC) elements created by locally inflating some of the air holes whil...
Temperature-insensitive refractive index sensing by use of micro Fabry–Pérot cavity based on simplified hollow-core photonic crystal fiber
A temperature-insensitive micro Fabry–Pérot (FP) cavity based on simplified hollow-core (SHC) photonic crystal fiber (PCF) is demonstrated. Such a device is fabricated by splicing a section of SHC ...
Ultrahigh birefringence index-guiding photonic crystal fiber
We reported an ultrahigh birefringence PCF with a germanium-doped elliptical core, which is fabricated in our lab using the stack-and-draw method, and an ultrahigh birefringence of 1.1×10-2 is obta...
Compressible fiber optic micro-Fabry-Pérot cavity with ultra-high pressure sensitivity
We propose and demonstrate a pressure sensor based on a micro air bubble at the end facet of a single mode fiber fusion spliced with a silica tube. When immersed into the liquid such as water, the ...
Enhancement of acoustic sensitivity of hollowcore photonic bandgap fibers
The acoustic pressure sensitivities of hollow-core photonic bandgap fibers (HC-PBFs) with different thicknesses of silica outer-cladding and polymer jacket were experimentally investigated. Experim...
Experimental demonstration of 10 Gb/s multilevel carrier-less amplitude and phase modulation for short range optical communication systems
Carrier-less amplitude and phase (CAP) modulation can be a good candidate for short range optical communications for considerable computational complexity reduction and simple system structure. In ...
Generation of square or hexagonal 16-QAM signals using a dual-drive IQ modulator driven by binary signals
We propose a simple square or hexagonal 16-QAM signal generation technique using a commercially available dual-drive IQ modulator driven by four binary electrical signals with properly designed amp...
Investigation of interface states in single-negative metamaterial layered structures based on the phase properties
The physical mechanism of the interface states in layered structures consisting of single-negative metamaterials is investigated using a simple resonant cavity model. We found that the interface st...
Mode coupling dynamics and communication strategies for multi-core fiber systems
The propagation dynamics of 7-core multi-core fibers (MCFs) with identical and three-types of cores are analytically derived based on the coupled-mode theory. The mode coupling dynamics can be aper...
Super-resolution image transfer by a vortex-like metamaterial
We propose a vortex-like metamaterial device that is capable of transferring image along a spiral route without losing subwavelength information of the image. The super-resolution image can be guid...
Ultra-broadband infrared luminescence of Bi-doped thin-films for integrated optics
Ultra-broadband infrared luminescence has been observed in bismuth (Bi)-doped germanate thin-films prepared by pulsed laser deposition. The films are compatible with various types of substrates, in...
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