Electrical Engineering and Computer Science


Center for Photonic and Multiscale Nanomaterials Seminar

General electromagnetic eigenstates and the field of an oscillating dipole in a flatslab composite structure

Asaf Farhi


PostDoc
Tel Aviv University, Israel
 
Friday, September 16, 2016
2:00pm - 3:00pm
2906 Cooley, Baer Conference Room

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About the Event

An exact calculation of the local electric field is described for the case of an external current or plane wave source in a setup of an ϵ_1,μ_1 slab in an ϵ_2,μ_2 medium. For this purpose we first calculate all the general eigenstates of the full Maxwell equations. These eigenstates are then used to develop an exact expansion for the physical values of the electric field in the system characterized by physical values of ϵ_1, ϵ_2, μ_1, and μ_2. Results are compared with those of a previous calculation of the local field where μ=1 everywhere. Numerical results are shown for the eigenvalues in practically important configurations where attaining an optical image with sub-wavelength resolution has practical significance. We show that the contribution of the high k TM eigenstates is enhanced when ϵ_1=-ϵ_2 and the contribution of the high k TE eigenstates is enhanced when μ_1=-μ_2 where the enhancement of the evanescent waves starts from lower k values as we approach a setup with both ϵ_1=-ϵ_2 and μ_1=-μ_2. We also show that the eigenfunctions for the setup where μ=1 everywhere correspond to configurations of 3D phased arrays.

Additional Information

Contact: Bett Weston

Phone: 647-1719

Email: bweston@umich.edu

Sponsor(s): C-PHOM

Faculty Sponsor: Roberto Merlin, Ted Norris

Open to: Public