Magnetic light-matter interactions in a photonic crystal nanocavity.

We study the magnetic coupling between a metal-coated near-field probe and a photonic crystal nanocavity. The resonance of the nanocavity shifts to shorter wavelengths when the ringlike apex of the probe is above an antinode of the magnetic field of the cavity. We show that this can be attributed to a magnetic light-matter interaction and is in fact a manifestation of Lenz's law at optical frequencies. We use these measurements to determine the magnetic polarizability of the apex of the probe and find good agreement with theory. We discuss how this method could be applied to study the electric and magnetic polarizibilities of nano-objects.

[1]  T. Wilk,et al.  Single-Atom Single-Photon Quantum Interface , 2007, Science.

[2]  Ewold Verhagen,et al.  Electric and magnetic dipole coupling in near-infrared split-ring metamaterial arrays. , 2009, Physical review letters.

[3]  Francisco Medina,et al.  Role of bianisotropy in negative permeability and left-handed metamaterials , 2002 .

[4]  Annamaria Gerardino,et al.  Magnetic imaging in photonic crystal microcavities. , 2010, Physical review letters.

[5]  R. Merlin.  Metamaterials and the Landau–Lifshitz permeability argument: Large permittivity begets high-frequency magnetism , 2009, Proceedings of the National Academy of Sciences.

[6]  J. Pendry,et al.  Magnetism from conductors and enhanced nonlinear phenomena , 1999 .

[7]  A Leinse,et al.  Probing the Magnetic Field of Light at Optical Frequencies , 2009, Science.

[8]  D. Wiersma,et al.  Spectral tuning and near-field imaging of photonic crystal microcavities , 2008 .

[9]  E. Ulin-Avila,et al.  Three-dimensional optical metamaterial with a negative refractive index , 2008, Nature.

[10]  Lan Yang,et al.  On-chip single nanoparticle detection and sizing by mode splitting in an ultrahigh- Q microresonator , 2010 .

[11]  Maria Kafesaki,et al.  Controlling the resonance of a photonic crystal microcavity by a near-field probe. , 2005, Physical review letters.

[12]  Steven G. Johnson,et al.  Photonic Crystals: Molding the Flow of Light , 1995 .

[13]  T. Asano,et al.  High-Q photonic nanocavity in a two-dimensional photonic crystal , 2003, Nature.

[14]  David R. Smith,et al.  Controlling Electromagnetic Fields , 2006, Science.

[15]  Shanhui Fan,et al.  Coupling of modes analysis of resonant channel add-drop filters , 1999 .

[16]  Philippe Lalanne,et al.  Near-field interactions between a subwavelength tip and a small-volume photonic-crystal nanocavity , 2007 .

[17]  M. Soljačić,et al.  Roughness losses and volume-current methods in photonic-crystal waveguides , 2005 .

[18]  M. Wegener,et al.  Simultaneous Negative Phase and Group Velocity of Light in a Metamaterial , 2006, Science.

[19]  E. M. Lifshitz,et al.  Electrodynamics of continuous media , 1961 .

[20]  S. Noda,et al.  Ultrahigh-$Q$ Nanocavities in Two-Dimensional Photonic Crystal Slabs , 2006, IEEE Journal of Selected Topics in Quantum Electronics.