INTRODUCTION: Na-MRI (Na-MRI) can provide unique and direct information about the tissue viability after stroke [1], and the integrity of tumor tissue [2]. Nevertheless, clinical routine use of Na-MRI techniques is mostly hindered by the required specialized resonator systems. Especially the lack of available homogeneous B1-field excitation at the Na frequency limits the day to day use of these...

In this paper, atomic layer deposited (ALD) alumina (Al2O3) has been demonstrated as the structural material for a micro-resonator for the first time. An electrostatically actuated micro-bridge made of chromium (Cr) coated ALD Al2O3 was used as a resonator. The resonator was formed by simple wetand dry-etching processes. The static displacement profile of the micro-resonator under electrostatic...

In this paper, a novel approach has been suggested to obtain an improved spurious-free window for dielectric resonator in microwave integrated circuit environment. In microwave integrated circuit environment, the dielectric resonator placed on a thin dielectric substrate gets located asymmetrically with respect to its shielding enclosure. A reduced separation in frequencies (mode separation) is...

Chengkuo Lee National University of Singapore Department of Electrical and Computer Engineering 4 Engineering Drive 3 Singapore, Singapore 117576 E-mail: [email protected] Abstract. The characteristics of biochemical sensors based on photonic crystal (PC) resonators are investigated in this work. The PC structure consists of holes arranged in a hexagonal lattice on a silicon slab. The nanoring r...

This paper describes a newly patented, low power, ovenized oscillator with the crystal heated directly by means of a thin film resistive heater deposited on its surface. Mounting the resonator inside an evacuated enclosure forms a miniature "thermos" bottle. The only significant path for heat loss is through the resonator mounting ribbons and posts and these, being long and thin, have quite hig...

The resonator of a solid-state vibratory gyro is responsible for sensing angular motion. Frequency splitting of an axisymmetric-shell resonator is a common problem caused by manufacturing defects. The defect causes a frequency difference between two working modes which consist of two nodes and two antinodes. The difference leads to the loss of gyroscopic effect, and thus the resonator cannot se...

It has been shown recently that stimulated Raman radiation can be built up in the off-axis direction using a resonator the axis of which is rotated from the axis of the ruby laser resonator.'S3 The stimulated Brillouin scattering which has been found by Chiao, Townes, and Stoicheff4 shows a characteristic which is different from that of the stimulated Raman scatterings: the stimulated Brillouin...

A technique for contactless electromagnetic interrogation of AT-cut quartz piezoelectric resonator sensors is proposed based on a primary coil electromagnetically air-coupled to a secondary coil connected to the electrodes of the resonator. The interrogation technique periodically switches between interleaved excitation and detection phases. During the excitation phase, the resonator is set int...

By controlling the internal loss of a ring resonator near critical coupling, we demonstrate control of the transmitted power in a fiber that is coupled to the resonator. We also demonstrate wavelength-selective optical amplification and oscillation.

A microring resonator sensor device for sensitive detection of the explosive 1,3,5-trinitrotoluene (TNT) is presented. It is based on the combination of a silicon microring resonator and tailored receptor molecules.