TY - JOUR
T1 - Enhanced diffraction by a rectangular grating made of a negative phase-velocity (or negative index) material
AU - Depine, Ricardo A.
AU - Lakhtakia, Akhlesh
AU - Smith, David R.
N1 - Funding Information:
R.A.D. acknowledges partial support from CONICET (Grant: ANPCYT-BID 802/OC-AR03-04457), and A.L. from the Mercedes Foundation.
PY - 2005/3/28
Y1 - 2005/3/28
N2 - The diffraction of electromagnetic plane waves by a rectangular grating formed by discrete steps in the interface of a homogeneous, isotropic, linear, negative phase-velocity (negative index) material with free space is studied using the semi-analytic C method. When a nonspecular diffracted order is of the propagating type, coupling to that order is significantly larger for a negative index material than for a conventional material. The computed coupling strengths reported here are in agreement with recent experiments, and illustrate the role of evanescent fields localized at the grating interface in producing this enhanced coupling.
AB - The diffraction of electromagnetic plane waves by a rectangular grating formed by discrete steps in the interface of a homogeneous, isotropic, linear, negative phase-velocity (negative index) material with free space is studied using the semi-analytic C method. When a nonspecular diffracted order is of the propagating type, coupling to that order is significantly larger for a negative index material than for a conventional material. The computed coupling strengths reported here are in agreement with recent experiments, and illustrate the role of evanescent fields localized at the grating interface in producing this enhanced coupling.
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U2 - 10.1016/j.physleta.2005.01.028
DO - 10.1016/j.physleta.2005.01.028
M3 - Article
AN - SCOPUS:14644403617
SN - 0375-9601
VL - 337
SP - 155
EP - 160
JO - Physics Letters, Section A: General, Atomic and Solid State Physics
JF - Physics Letters, Section A: General, Atomic and Solid State Physics
IS - 1-2
ER -