99% efficiency measured in the -1st order of a resonant grating.
A resonant diffraction grating comprising a mirror, a dielectric layer and a high index corrugation at the layer-air interface is shown to exhibit off-Littrow the record diffraction efficiency of 99% in the -1st reflected order at 1064 nm wavelength thanks to the excitation of a leaky mode of the layer. Such high figure is obtained by a grating 5 to 10 times shallower than in current attempts to realize high efficiency all-dielectric gratings.
Destouches
N
N
Tishchenko
A
A
Pommier
J
J
Reynaud
S
S
Parriaux
O
O
Tonchev
S
S
Ahmed
M
M