present a simple plasmonic lens composed of an annular slit and a single concentric groove
. The subwavelength groove can scatter the SPPs and constructively interfere to get a far-field focal spot.
This method uses two tools: a side cutting end mill with peripheral grooves, which cuts a series of concentric grooves
in the bore wall through interpolation, and a second rotary tool which deforms the grooves to produce an undercut.
The special advantages of the C Grove putter, he explains, are the concentric grooves
on the face of the putter which helps the ball roll smoothly off the face, as opposed to it jumping and skidding.
* "Record grooves" (or ripples or wave marks) are concentric grooves
or lines, usually at the leading edge of flow.
The hot plate style consists of a metal plate (usually aluminum) with or without concentric grooves
where the temperature of the plate is set and controlled using either an inexpensive potentiometer dial or a high-end temperature controller.
NBMG 11015/1 Massive RG,CG NBMG 11015/2 Massive RG NBMG 11016/1 Laminate CG (?), approximate value; RG, radial grooves; CG, concentric grooves
; CR, concentric ridges; n.o., not observed
Like Mirro's existing Concentric Air line of conventional aluminum cookware, bottoms of pieces have concentric grooves
that control heat distribution, the company said.
A pattern of concentric grooves
-- each 1 micrometer wide and about 0.35 micrometer deep -- cut into the laser's top surface focuses the light to a spot 8 micrometers wide.
During their manufacture, concentric grooves
are stamped on the recording surface about 20 microns apart.
Crafted simply from a single block of wood on a turner's lathe, their only decoration, if they had any at all, was restricted to concentric grooves
on the base, or cup, although well-figured wood ensured their beauty.