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- Last Date to Submit Master's Thesis Format ReviewAll day
- Boston University Digital Learning & Innovation: ChatGPT Symposium 20238:30 am
- MechE PhD Dissertation Defense: Ke Wu10:00 am
- Tai Chi (Advanced Course)12:00 pm
- BUMC FDD Seminars-Quality over Quantity: The Journey to Make Value-Based Care a reality for Providers at BMC 12:00 pm
- BU CCD: Resume & Cover Letter Review Drop-Ins12:00 pm
- LGBTQIA+ Faculty & Staff Luncheon12:00 pm
- Rodney Seminar: Medical Sovereignty, Self-Reliance, and Maternal Mortality in Eritrea12:30 pm
- "Race-Disability Intersectionality as a Health Equity Imperative" The Pike Lecture featuring Professor Mary Crossley, University of Pittsburgh School of Law12:45 pm
- Managing Anxiety Group3:00 pm
- Mindful Movement Yoga3:00 pm
- Black Students Support Group4:00 pm
- Stress ReLeaf: Working with Tea for Calm & Focus4:00 pm
- BU Study Abroad: First-Gen Abroad Panel & Dinner5:00 pm
- Mindfulness Meditation Group5:00 pm
- BU Law: Let's Talk Wrongful Convictions5:00 pm
- COM: "Framing Agnes" Screening and Director Q&A5:00 pm
- Community Dinner at Marsh Chapel5:00 pm
- WBUR: A conversation with gun control activist David Hogg on the anniversary of Parkland6:30 pm
- Percussion Ensemble Concert8:00 pm
MechE PhD Dissertation Defense: Ke Wu
TITLE: MAGNETIC FIELD ENHANCEMENT IN METAMATERIALS: FROM THEORY TO APPLICATION
ABSTRACT: Metamaterials, defined as artificially constructed materials composed of subwavelength meta-atoms, have emerged as a promising tool to manipulate electromagnetic (EM) waves due to their extraordinary responses to incident EM waves. Efforts in developing metamaterials have progressed from initial demonstrations of breaking the generalized limitations of refraction and reflection of natural materials, to their current use in facilitating a range of practical applications. One flourishing research direction is the applications of metamaterial in electromagnetic field enhancement. The enhanced magnetic fields are attractive for a variety of applications such as magnetic resonance imaging (MRI), wireless power transfer, and magnetic induction tomography, among others.The common thread across this dissertation is incorporating conventional and novel methods to create some functional magnetic metamaterials for field enhancement, considering the practical application scenarios. First, this dissertation investigates mechanically tunable metamaterials by integrating EM resonators with deployable auxetics. Aided by digital parametric design tools, the computationally designed metamaterials could conformably cover a person’s kneecap, ankle, head, or any part of the body in need of imaging, and meanwhile they are readily to be tuned for ensuring frequency match, making magnetic metamaterials more feasible in clinical scenarios. Second, this dissertation presents a flexible, smart metamaterial composed of an assembly of meta- atoms featuring a controlling circuit loaded spiral resonator (CCLSR) inductively coupled with a varactor-loaded ring resonator (VLRR). The reported metamaterial may not only be readily tuned to achieve precise frequency match with MRI by a controlling circuit, but is also capable of selectively amplifying the magnetic field by sensing excitation signal strength passively, thereby remaining ‘off’ during RF transmission and ensuring its optimal performance when applied to MRI. Third, this dissertation introduces a metamaterial- enhanced near-field readout platform for interrogating passive microsensor tags. With the unique evanescent wave amplification properties, the insertion of a metamaterial between the transmitter and receiver antennas could amplify the magnetic flux density and, thus, increase the coupling coefficient, ultimately improving the wireless power transfer efficiency. These functional metamaterials demonstrated in this thesis can be employed to construct application-oriented electromagnetic devices and facilitate metamaterial-based technologies.
COMMITTEE: ADVISOR Professor Xin Zhang, ME/ BME/ECE/MSE; CHAIR Professor Tom Bifano, ME/BME/ECE/MSE; Professor Chuanhua Duan, ME/MSE; Professor Lei Tian, ECE/BME; Professor Stephan Anderson, Radiology/BUSM/ME
When | 10:00 am to 12:00 pm on Monday, March 27, 2023 |
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Location | ENG, 110 Cummington Mall (245) |