F. Liu, S. Crozier, A. Trakic, B. Xu, B. Li, Q. Wei School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, QLD, Australia Synopsis Numerical simulations are used in an attempt to find optimal source profiles for high frequency RF coils. Shielded circular and elliptical birdcage coils operating at 170MHz, 300MHz and 470MHz are studied. The 2D-FDTD op...

Nanostructured active or absorbing layers of solar cells, including photonic crystals and wire arrays, have been increasingly explored as potential options to enhance performance of thin film solar cells because of their unique ability to control light. We show that 2D photonic crystals can improve light trapping by an enhanced density of optical states and improved incoupling, and demonstrate,...

This article details microfabrication of two-dimensional tungsten photonic crystals (2D W PhCs) for high-temperature applications such as selective thermal emitters for thermophotovoltaic energy conversion. In particular, interference lithography and reactive ion etching are used to produce large area single crystal tungsten 2D PhCs. For this investigation, we fabricated a 2D W PhC sample consi...

Among various photonic crystal devices, ultra compact channel drop filters based on resonance coupling between waveguide modes of line defects and cavity modes of point defects have attracted researchers attention due to the substantial demand in wavelength division multiplexed (WDM) optical communication systems. We will investigate the properties of resonant modes which arise from the introdu...

We proposed an effective index perturbation method to investigate the intrinsic characteristics of three-dimensional photonic-crystal-slab based microcavity with two-dimensional numerical simulation tools such as two-dimensional finite-difference time-domain (2D-FDTD) and plane-wave expansion (2D-PWE) techniques, for reduced computational requirements and fast design feedback. Less than 2% comp...

In this paper we have proposed a tunable two dimensional (2D) photonic crystal (PhC) ring resonator configuration for application in optical analog to digital converter (ADC) systems. Quality factor and dropping efficiency at the resonance of our designed ring resonator are 202 and 100%, respectively. The quantity of transmission efficiency and quality factor (Q) are suitable for ADC applicatio...

Negative refraction of acoustic waves in a two-dimensional (2D) phononic crystal is studied by numerical simulation based on the finitedifference time-domain (FDTD) method. We calculate the phonon band structure of 2D phononic crystals, consisting of metal cylinders placed periodically in a liquid. By comparing several combinations of materials for metal cylinder and liquid, we analyze the depe...

Ultra wide band (UWB) microwave imaging has recently been proposed for detecting small malignant breast tumors and is expected to detect breast tumors with safety, comfort and precision for high resolution of UWB pulse. In this paper, we propose a new imaging method that uses circle approximation to detect the cancer in order for automatically detection without doctors’ analysis. Our proposal m...