The following operators can be used to better focus your queries.
( ) , AND, OR, NOT, W/#
? single char wildcard, not at start
* multi char wildcard, not at start
(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*
This guide provides a more detailed description of the syntax that is supported along with examples.
This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.
Concept Search - What can I type?
For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.
Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.
Disclosed is a method to produce variable groove depth grating waveguide couplers on planar waveguides using ion beam etching and a specially shaped aperture.
English (United States)
This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately
87% of the total text.
Variable Width Aperture Ion Etching Process
a method to produce variable groove depth grating
waveguide couplers on planar waveguides using ion beam etching and a
specially shaped aperture.
couplers can be used to couple light into or out of
planar waveguides. The intensity profile
of the light beam coupled
out of the waveguide can be controlled by varying the grating groove
depth along the waveguide propagation direction.
An example of
a variable groove depth grating profile that will
produce an out-coupled beam with a Gaussian profile is shown in Fig.
1. The dashed line shows the output beam
irradiance profile and the
solid line shows the required variable groove depth grating profile.
A specially shaped aperture is used to control the cross sectional
area of the ion beam impinging upon the planar waveguide (target)
during the ion beam etching process. The
target to be etched moves
along the y axis at a constant velocity, Vt, underneath the specially
shaped aperture. The specially shaped
aperture width, W(x), varies
along the x axis in a precise manner related to the desired grating
groove profile. The etched grating
groove depth, dg(x), is equal to
(W(x)*R)/Vt, where R is the ion beam etching rate. The desired
grating groove depth profile shown in Fig. 1 can be fabricated by
using a variable width aperture with a width, W(x), equal to dg(x)
*(Vt/R). This last equation shows that
the specially shaped apert...