Toward photonic-crystal metamaterials: Creating magnetic emitters in photonic crystals

Povinelli, M. L.; Johnson, Steven G.; Joannopoulos, J. D.; Pendry, J. B.
February 2003
Applied Physics Letters;2/17/2003, Vol. 82 Issue 7, p1069
Academic Journal
In this work, we explore the possibility of designing photonic crystals to act as magnetic metamaterials: structures that exhibit magnetic properties despite the nonmagnetic character of their constituents. The building blocks of a magnetic material are microscopic magnetic dipoles, and to create a synthetic analog we employ point-defect modes in a photonic crystal. We begin by identifying a point defect mode in a three-dimensional crystal whose local field pattern resembles an oscillating magnetic moment. By analyzing the far-field pattern of the field radiated from the defect, we prove quantitatively that such modes can be designed with a primarily magnetic character: over 98% of the emitted power goes into magnetic multipole radiation. Unlike the constituents of natural para- and ferromagnetic materials, these synthetic magnetic emitters can be designed to operate without losses even at optical frequencies.


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