One Dimensional Grating – Fourier Series – Direct Input
Creates a one dimensional grating pattern using a Fourier transform.
Getting Started:
Right click on the object in which a one dimensional grating is desired. The object can be a target, source, detector, or any object using the 2D viewer. Click edit to bring up the properties editor. Choose “Replace A Piece” from Menu Items and click go. When the “Replace A Piece” wizard comes up, choose “One Dimensional Grating” and click next. When the next panel comes up choose “Fourier Series – Direct Input” and click next. You will then see the following panel.
Base Period:
Important Note: If the chosen period is too close to the sampling of the object results may be unpredictable. If you experience problems with this increase your sampling by decreasing the distance between the samples “X Sampling” and “Y Sampling” in the properties of the object. However decreasing these values too much can cause your computer to slow down considerably and even freeze when you try to add, multiply, or replace a piece.
Center Shift:
Distance in meters that the center of the slit should be shifted relative to the period.
Angle:
Angle of rotation in degrees of the entire grating. Choosing zero degrees results in a vertical grating.
Coefficients:
a1 – a10 are the coefficients for the cosine part of the Fourier transform. b1 – b10 are the coefficients for the sine part of the transform.
Finishing the Wizard:
The Piece Size window is where the size and location of the grating is specified.
The grating will be re-interpolated based on the sampling of the mask it is being placed into.
If the Full Window Button is clicked, then the grating will replace the old mask entirely.
Scaling The Grating:
The scaling parameters specify the dynamic range of the grating.
One purpose of Bitmap Scaling is the addition of a phase factor to the grating.
Saving The Updated Mask:
Click “browse” to change directories
