arXiv subjects

J. M. Holt

Publications and source records attributed to J. M. Holt.

2 recordsLinked to original sources

arXiv2005

Image of Veselago lens based upon two-dimensional photonic crystal with triangular lattice

The construction of the multi-focal Veselago lens predicted earlier is proposed on the basis of a uniaxial photonic crystal consisting of cylindrical air holes in silicon that make a triangular lattice in a plane perpendicular to the axis of the crystal. The object and image are in air. The period of the crystal should be $0.44μ{\rm m}$ to work at the wavelength $1.5μ{\rm m}$. The lens does not provide superlensing but the half-width of the image is $0.5λ$. The lens is shown to have wave guiding properties depending on the substrate material.

cond-mat.mtrl-sci↗

arXiv2005

Far-field image of Veselago lens

It is shown that perfect imaging of a point source both in near- and far-field regions contradicts electrodynamics although ``superlensing'' is impossible only in the far-field region. These general statements are illustrated by detailed study of evanescent wave propagation in a photonic crystal that is known to be a left-handed medium. An analytical expression for the intensity distribution near the far-field focus is obtained. This distribution contains some novel features and establishes a new ``diffraction limit'' for flat lenses. It is generalized for multiple sources located at different points. The distribution is in very good agreement with computer simulation.

cond-mat.mtrl-sci↗