Habiba Begum

Southeast University | SEU · Department of Electrical and Electronic Engineering

Micro- and nano-electromechanical systems resonators have been regarded as powerful tools for precision mass detection, and their abilities to measure these in a liquid environment open various opportunities for biosensing, chemical analysis, and environmental monitoring. Apart from overcoming issues of fluidic damping and electrical interfaces, th...

We have developed a hybrid device that fuses the techniques of acoustofluidic localization and resonator-based mass sensing of particles in liquid-phase for in-situ analysis in a $\mu \text{L}$ droplet. An elliptic plate resonator (EPR) was used in this work to verify the capability of acoustofluidic manipulation on a resonator chip. Particles we...

Various microelectromechanical (MEM) resonator topologies have been proposed for liquid phase sensing applications. Low liquid phase motional resistance (Rm) and moderately high liquid phase quality factor (Q) are critical to the performance of oscillators based on these resonators for real-time frequency tracking in sensing applications. We recent...

The ability to weigh microsubstances present in low concentrations is an important tool for environmental monitoring and chemical analysis. For instance, developing a rapid analysis platform that identifies the material type of microplastics in seawater would help evaluate the potential toxicity to marine organisms. In this study, we demonstrate th...

This paper investigates the characteristics of higher-order transverse mode fully clamped membrane resonators that are piezoelectrically transduced as a class of resonators that completely seal the domain above the resonator from the domain below. Such isolation between the top and bottom of a resonator is preferable when encasing the device in a m...

Key to realizing practical resonators for liquid-phase sensing applications is efficient electromechanical transduction and reasonable Q in liquid, which determine the motional resistance (Rm). Both lower Rm and high liquid phase Q are important for realizing a more stable close-loop oscillator to allow a lower detection limit. But Rm usually incre...

Previous works have demonstrated the use of acoustic waves to manipulate microparticles and biological samples on bare glass and silicon superstrates. Traditionally, the surface acoustic wave (SAW) is converted into a Lamb wave propagating within a bare silicon superstrate via a thin coupling agent. The potential impact of acoustically driven micro...

A technique and electronic circuit for contactless electromagnetic interrogation of piezoelectric micro-electromechanical system (MEMS) resonator sensors are proposed. The adopted resonator is an aluminum-nitride (AlN) thin-film piezoelectric-on-silicon (TPoS) disk vibrating in radial contour mode at about 6.3 MHz. The MEMS resonator is operated in...

We present, for the first time, mass sensitivity measurements of a novel resonant mode based on a disk resonator that delivers the one of the highest Q-factors among resonators tested in liquid (Q of 362). The mode of interest is referred to as the Button-like (BL) mode as its associated lateral strain profile resembles a shirt button. In the conte...

We present a 5.41 MHz square-extensional (SE) mode resonator in closed-loop oscillation for resonant mass sensing in the liquid phase. The resonator has been fabricated in piezoelectric thin film aluminum nitride (AlN) on silicon (Si). The strain profile of the SE mode allows for higher electromechanical coupling efficiency using piezoelectric tran...

A simple design of single-feed polarization-reconfigurable microstrip antenna is presented in this paper. The antenna includes a circular radiating patch, a probe feed, and two parasitic pins. Through tuning the reactive loads between the parasitic pins and the ground plane, the antenna's polarization can be reconfigured among linear polarization,...