ElectroHolography Laboratory

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.
=====ESEM Recipes=====

This page is only for ESEM Recipes.


june 1st 2015
30kv 

  * spot 6  3.5nA
  * spot 5  1.4nA
  * spot 4  410pA
  * spot 3  126pA
  * spot 2   38pA
  * spot 1   23pA

------

==Writing order: Horizontal and Vertical Raster==

{{square_1.jpg?direct&100|}}
Start: Bottom Left, H raster, bottom to top. Point movement: RULD

{{square_2.jpg?direct&100|}}
Start: Bottom right, V raster, right to left. Point movement: ULDR

{{square_3.jpg?direct&100|}}
Start: Bottom Left, H raster, bottom to top. Point movement: URDL

{{square_4.jpg?direct&100|}}
Start: Top Left, V raster, left to right. Point movement: DRUL

Translations: Start 1, rotate 90 for 2, mirror in X for 3, mirror in Y for 4. 

------

==MAGNIFICATION SPECIFICATIONS==

In DesignCad, the units are um. Make the pattern in the file exactly as large as you want it to come out. Adjust the pattern origin to fit the maximum magnification. (Unless you want the origin to not be in the center). 

In the NPGS menu, make sure the magnification matches the MaxMag. (Less than or equal to). If you are using the largest magnification possible, round down to the nearest nice number to work with. 

On the computer, set the magnification to match the NPGS specification. Make sure it is set to the [Display] setting, not the [Photo] setting.  

------

==Basic Operating Procedure==

{{esem1.png?direct&600|}}

{{esem2.png?direct&300|}}

Writing With E-Beam:

Retrieve gloves, little scissors, carbon tape, (Dry Lab- east wall, north end drawers) tweezers 

Log onto computer C (see figure A): 	user: SEMCLASS  password: semstudents

Vent Chamber

Log onto computer A (see Figure A): name: davis password: 90901

After logging on and running calibration, press the <return> but to start the second calibration

Open up NPGS and check pattern to be uploaded

Turn F to Litho at both locations, turn on H & G

Press “Zero Check” (zero out H by pressing "shift" + "Zero Check" on H. Do this while it's pumping down).

Check that G is set to External

Mount sample onto flat stand w/ Faraday cup

Keep sample aligned with black stub on top

Add conductive tape to base of sample, connecting to stand (ONLY IF LiNbO3)

Open chamber on E-beam machine

Place mounted sample into E-beam oriented upwards (Faraday Cup goes UP)

Insert Beam Blanker.

Change switch from A to C (Figure B)

Hold door closed and press the Pump button

Attach Coax to the door of the E-beam, and the beam blanker tube to the back of the beam blanker

Align X with the top edge of the sample

Focus on the top left corner of the sample down to half the resolution you need. (If smallest feature is 5um, focus down to 1um. If 200nm, focus to 100nm. Do your best). 

Set magnification and spot size to specifications of the run file (Make sure you are in Display mode, not Photo). On of the modes (photo?) multiplies the magnification by 2.5. So if you want mag x100 you should set it to mag x40. See above for spot size you should select for the energy measured. To measure the energy focus in on the Faraday Cup with the beam un-blanked.

Check Beam is at 30 kV, Spot size, magnification

Set Scan to External XY on Computer C

Blank Beam (by turning on G and making sure it is set to "ext". Do not blank beam on monitor)

Run file on Computer A ("process run file" on NPGS program)

Ensure that the nanoammeter doesn’t remain at zero while writing (that would mean the beam is completely blanked still) 

Wait for the file to complete running 

A fancy noise will sound at the end of each pattern written

Vent the chamber when you are done with all patterning. Remove sample. 

Return all settings on machines to original values

The two F blocks must be changed back to original values

Disconnect Coax cable and e-beam wire

Remove E-Beam blanker. Wait til chamber is vented before doing so.

Switch in E-Beam needs to set back to A

Close door of E-Beam and press Pump on Computer C

Wait for “Pump OK” sign and turn off/ log off all machines in room
ElectroHolography Laboratory

User Tools

Site Tools

Page Tools
