Chan group
Evanscent field coupling in subwavelength metallic structures
Surface plasmons are collective excitations of the electron density guided by a metal-dielectric interface. Advances in fabrication technologies have produced artificial metallic nanostructures that control surface plasmons and their coupling to light. The nanostructures could be designed to channel the optical energy to specific locations, so that the evanescent fields on the metal surface becomes strongly enhanced.
The majority of optical transmission experiments on subwavelength metallic structures were performed with a single layer of metal. We have fabricated subwavelength structures consisting of two layers of metal. The metal layers are positioned sufficiently close to each other so that their evanescent fields can couple. In some cases the two metal layers are laterally displaced such that no direct line of sight exists through the structure. Nevertheless, the transmission through a number of these devices remains remarkably high at resonance, exceeding the single layer value. We have demonstrated that both the intensity and the phase of the transmitted light can be controlled by tailoring the evanescent field coupling between the two layers. Such double-layer structures possess certain optical properties that cannot be achieved with a single metal layer.
Propagation dynamics of femtosecond pulse through subwavelength metallic hole arrays
H. M. Su, Z. H. Hang, Z. Marcet, H. B. Chan, C. T. Chan and K. S. Wong
Physical Review B 83, 245449 (2011). pdf
A half wave retarder made of bilayer subwavelength metallic apertures
Z. Marcet, H. B. Chan, D. W. Carr, J. E. Bower, R. A. Cirelli, F. Klemens, W. M. Mansfield, J. Miner, C. S. Pai and I. Kravchenko
Applied Physics Letters 98, 151107 (2011). pdf
Optical transmission through double-layer, laterally shifted metallic subwavelength hole arrays
Z. Marcet, Z. H. Hang, C. T. Chan, I. Kravchenko, J. E. Bower, R. A. Cirelli, F. Klemens, W. M. Mansfield, J. Miner, C. S. Pai and H. B. Chan
Optics Letters 35, 2124 (2010). pdf
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Using nano-optics to control the phase of light
Y. Carts-Powell
Optics & Photonics News 19, 6 (2008). pdf
Controlling the phase delay of light transmitted through double-layer metallic subwavelength slit arrays
Z. Marcet, J. W. Paster, D. W. Carr, J. E. Bower, R. A. Cirelli, F. Klemens, W. M. Mansfield, J. Miner, C. S. Pai and H. B. Chan
Optics Letters 33, 1410 (2008). pdf
Optical transmission through double-layer metallic subwavelength slit arrays
H. B. Chan, Z. Marcet, Kwangje Woo, D. B. Tanner, D. W. Carr, J. E. Bower, R. A. Cirelli, E. Ferry, F. Klemens, J. Miner, C. S. Pai and J. A. Taylor
Optics Letters 31, 516 (2006). pdf