Department Seminar of Dr. Asaf Farhi - Excitation of absorbing exceptional points in the time domain

School of Mechanical Engineering Seminar
Monday, January 11, 2023 at 14:00
Classrooms building, Room 205

 Excitation of absorbing exceptional points in the time domain

Dr. Asaf Farhi

Post-doc fellow, Applied Physics Department, Yale University

Acoustical and optical resonators can be tuned to an absorbing exceptional point, at which both the eigenfrequencies and the eigenmodes associated with perfect capture of an input wave coalesce. We find that a time-domain signature of the EP is an expansion of the class of waveforms which can be perfectly captured. We show that such resonators have improved performance for storage or transduction of energy. They also can be used to convert between waveforms within this class. We analytically derive these features and demonstrate them for several examples of coupled resonator systems. Finally, we introduce a mechanism to naturally generate these wavefroms.

If time permits, we will analyze vibrational modes of helical structures and their coupling to electromagnetic fields and electric dipoles and explore the possibility of exciting high-order atomic and molecular multipoles in the far field with potential to achieve subatomic resolution

Short Bio:

Asaf Farhi is a postdoc at Yale University, Applied Physics Department. He did his undergraduate degree in electrical engineering at the Technion, MSc in physics at Weizmann Institute of Science, and PhD in physics at Tel Aviv University with Prof. David Bergman as the advisor. Before coming to Yale, he did a postdoc at CREOL, UCF.

During his PhD, Asaf did research on eigenfunctions of Maxwell's equations and explored interesting physical phenomena that arise from unique properties of their eigenvalues. His postdoc at CREOL focused on vibrational modes of helical structures and their interaction with electric dipoles, motivated by the diverse functionality of the microtubule in cellular processes. During his postdoc at Yale, he studied the time domain signature of exceptional points, at which both the eigenvalues and eigenmodes coalesce, that applies to acoustics, electrodynamics, and quantum physics. Additional research directions that he is pursuing are applying statistical mechanics to calculate the strength of molecular processes using MD simulations, a platform with a potential to achieve subatomic resolution in the far field by exciting high-order atomic and

molecular multipoles, and enabling forbidden rotational and vibrational-rotational molecular transitions using nanostructures.

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https://tau-ac-il.zoom.us/j/4962025174?pwd=bVJUeElXRUUya3BERisyNllLOE9EZz09