Search found 82 matches

by siliconGary
Sun Mar 26, 2017 4:24 pm
Forum: Photography Through the Microscope
Topic: interference microscopy
Replies: 12
Views: 1513

I can recall using this technique (back in the 80's) to measure Silicon junction depth. We polished a shallow bevel in the silicon, and measured electrical junction with a 2/3 point probe that auto-stepped down the bevel, and then calibrate the depth using the interference microscope to accurately m...
by siliconGary
Wed Feb 08, 2017 8:35 pm
Forum: Equipment Discussions
Topic: Substitute for the resolution test slide 3000
Replies: 71
Views: 14153

Gary, thanks for the explanation. I gather that the physics of the color is thin-film interference, but my intuition is wrong about how much the color will change with angle. The calculator at http://www.cleanroom.byu.edu/color_chart.phtml says that " the color generated by nitride or oxide on sili...
by siliconGary
Wed Feb 08, 2017 3:46 pm
Forum: Equipment Discussions
Topic: Substitute for the resolution test slide 3000
Replies: 71
Views: 14153

Looking at the images it doesn't look like photoresist to me. I am pretty sure that is just a patterned aluminum film on silicon oxide on silicon. The texture in the brightfieqld shot definitely looks like sputtered aluminum to me. I think I'm reacting to the uniform pink color of the dark regions....
by siliconGary
Wed Feb 08, 2017 11:23 am
Forum: Equipment Discussions
Topic: Substitute for the resolution test slide 3000
Replies: 71
Views: 14153

Looking at the images it doesn't look like photoresist to me. I am pretty sure that is just a patterned aluminum film on silicon oxide on silicon. The texture in the brightfieqld shot definitely looks like sputtered aluminum to me.
by siliconGary
Tue Feb 07, 2017 6:03 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Glass needle vs. other pointy things
Replies: 5
Views: 1383

Nice image. I am impressed you could arrange all those tips without them touching each other.
by siliconGary
Wed Feb 01, 2017 8:10 pm
Forum: Photography Through the Microscope
Topic: Enigmatic Hyundai IC detail
Replies: 4
Views: 801

You learn something new every day :) Googling them from their WIKI "Hynix was founded as Hyundai Electronics Industries Co., Ltd. (1983) (The name Hynix comes from Hy in Hyundai and nix [from nics in Electronics])." https://en.wikipedia.org/wiki/SK_Hynix . I have always known them as Hynix (They cha...
by siliconGary
Wed Feb 01, 2017 1:34 pm
Forum: Photography Through the Microscope
Topic: Enigmatic Hyundai IC detail
Replies: 4
Views: 801

Its not an extra layer, it is on the same layer as the large horizontal stripes of metal above and below it in the image. There are 3 or 4 layers of metal on this chip visible in this image. I think this is a Hynix chip (DRAM) not Hyundai. I am pretty sure Hyundai never made any silicon.
by siliconGary
Sat Jan 14, 2017 8:14 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Meteorite slice detail - chondrite NWA 5437
Replies: 4
Views: 1109

That is really neat. Love the colors and texture. Is it roughly polished to give a flat surface, or did you find a flat area to image on a irregular surface?
by siliconGary
Sat Jan 14, 2017 7:00 am
Forum: Photography Through the Microscope
Topic: X86 processor in high magnification
Replies: 6
Views: 1210

If you are referring to the small speckles that are prominent on the large areas of text then what you are seeing are Aluminum hillocks. On die of this vintage the metallization was Aluminum (Always bugged me why North America mis-spells that word but never mind ':?' ) To prevent electromigration (A...
by siliconGary
Tue Jan 10, 2017 3:43 pm
Forum: Photography Through the Microscope
Topic: Threads
Replies: 2
Views: 610

Threads

Was playing around looking at thread from my wifes sewing box. Quite difficult to image nicely with glare and the focus depth etc. First is red and black poly cotton 5x objective dark field epi illumination - EOS 1300D 25 image stack http://www.photomacrography.net/forum/userpix/5891_cotton_thread_2...
by siliconGary
Mon Jan 09, 2017 11:24 am
Forum: Equipment Discussions
Topic: Construction of an LED-light
Replies: 18
Views: 2679

Acrylic/poly carbonate collimating lens are very inexpensive. Carclo makes several. You can match them to your LED and the light pattern you want at LEDSupply http://www.ledsupply.com/led-optics I used one on a microscope illuminator it was ~$2 (They also come clear or frosted to serve as diffuser)
by siliconGary
Wed Jan 04, 2017 3:53 pm
Forum: Photography Through the Microscope
Topic: Corporate Logo on an IC
Replies: 5
Views: 548

Re: Chip law

Very interesting. I wa surprised how liberally the semiconductor industry allows reverse engineering. Its a common belief that reverse engineering is perceived as 'sketchy' or morally wrong. To take something apart and study how it is made is normal and perfectly acceptable thing to do. It is almos...
by siliconGary
Tue Jan 03, 2017 3:57 pm
Forum: Photography Through the Microscope
Topic: Corporate Logo on an IC
Replies: 5
Views: 548

Not a designer but my understanding is that chips are covered by the semiconductor protection act https://en.wikipedia.org/wiki/Semiconductor_Chip_Protection_Act_of_1984 which is not the same as copyright. I believe IC's are automatically covered and they do not need to apply for protection. I do no...
by siliconGary
Thu Dec 29, 2016 7:05 am
Forum: Equipment Discussions
Topic: Unbranded Camera Adapter on Olympus BH2
Replies: 15
Views: 2281

Charles its the Olympus NeoDplan 20X.
From your comments on my other thread about the LED illuminator I have removed the Nikon BDPlan 40X and am looking for a reasonable price 40-80X NeoDplan to replace it (Or NeoSPlan) as my next acquisition.
by siliconGary
Wed Dec 28, 2016 9:16 pm
Forum: Equipment Discussions
Topic: Unbranded Camera Adapter on Olympus BH2
Replies: 15
Views: 2281

Thank you Pau. Your maths make sense (I realized I mixed diameter with horizontal dimensions in my last post). It makes sense that I am losing a "respectable portion of the objective primary image" given the field of view is smaller than what I can see in the eyepieces. It seems to me that the 1.67 ...