Steve Mould has a great video on youtube explaining how they work https://www.youtube.com/watch?v=sv-38lwV6vc
The 3Blue1Brown video on holograms is fantastic: https://www.youtube.com/watch?v=EmKQsSDlaa4
Making holograms with a pen plotter
21–29 of 29 posts
Re: Making holograms with a pen plotter
#22This is "old Internet" style fun territory (along the same lines as the Tom7 fun, if not quite as deep). I felt that the olive oil + fingerprint + phone screen was a really nice way to illustrate the core concept. Especially clever because it used something common and annoying to help describe how the plotter does its thing.
Before getting further into the article I thought maybe he was going to show how to use the plotter to control the oil smearing technique, which honestly would have been kind of cool.
author here — the second I did that, I considered handing it to the robot. but ... robot with oil in my living room... I decided against it :)
Re: Making holograms with a pen plotter
#23This is "old Internet" style fun territory (along the same lines as the Tom7 fun, if not quite as deep). I felt that the olive oil + fingerprint + phone screen was a really nice way to illustrate the core concept. Especially clever because it used something common and annoying to help describe how the plotter does its thing.
thank you so much for the kind words!!
Re: Making holograms with a pen plotter
#24Re: Making holograms with a pen plotter
#25It would be interesting to augment the plotter with a Unimorph piezoelectric disk scanner [1], to enable finer movement so lines can be drawn closer together. [1] https://john-alexander42.github.io/simple-stm-web-page/Disk_...
interesting! the axidraw v3 that I used for this (https://shop.evilmadscientist.com/productsmenu/846) has a 0.0125mm stepper resolution, which means that it is pretty close to not-worth-it to go any finer since the sizes of the scratches are already many microns wide. But certainly with better etching technology that would be a super cool update!
Re: Making holograms with a pen plotter
#26Related: ”Self Reflected” by neuroscientist and artist Gregg Dunn, https://www.sothebys.com/en/articles/self-reflected-a-giant-... He uses the third dimension to encode time, so that you get an image of the brain that illustrates how signals propagate dynamically between brain regions. I have a version of this on my wall and its mesmerizing to look at with the right lighting conditions
omg that rocks
Re: Making holograms with a pen plotter
#27It would be interesting to augment the plotter with a Unimorph piezoelectric disk scanner [1], to enable finer movement so lines can be drawn closer together. [1] https://john-alexander42.github.io/simple-stm-web-page/Disk_...
interesting! the axidraw v3 that I used for this ( https://shop.evilmadscientist.com/productsmenu/846 ) has a 0.0125mm stepper resolution, which means that it is pretty close to not-worth-it to go any finer since the sizes of the scratches are already many microns wide. But certainly with better etching technology that would be a super cool update!
The disk is part of a larger Scanning Tunneling Microscope project.
https://john-alexander42.github.io/simple-stm-web-page/Proje...
Alexander's results show a movement range of 1.25um, 10 times smaller than the 12.5um step of your system, so in its current form it wouldn't be suitable for interpolating motor steps.
Also potentially interesting is Alexander's "cut-and-pull" technique for making scanning tips with a single atom at the point. I can't find the original reference, but here's a description:
https://www.nanophys.kth.se/nanolab/afm/icon/bruker-help/Con...
The single atom would likely immediately wear down if used for scribing, but even if it wore down to multiple atoms wide it might still produce a very narrow line? I wonder what the effects of using an STM on a photosensitive plate would be, whether the strong electric field at the tip would lead to very narrow photographic lines?
Re: Making holograms with a pen plotter
#28Related: ”Self Reflected” by neuroscientist and artist Gregg Dunn, https://www.sothebys.com/en/articles/self-reflected-a-giant-... He uses the third dimension to encode time, so that you get an image of the brain that illustrates how signals propagate dynamically between brain regions. I have a version of this on my wall and its mesmerizing to look at with the right lighting conditions
Beautiful. This needs to be an HN post on its own. Please post. I will upvote.
Done, enjoy! I posted links to his web site instead of Sotheby’s. Even though his web site is a little broken, it had much more detail on the technical process, which I think HN will appreciate.
Re: Making holograms with a pen plotter
#29Earlier quoted context omitted.
Beautiful. This needs to be an HN post on its own. Please post. I will upvote.
Done, enjoy! I posted links to his web site instead of Sotheby’s. Even though his web site is a little broken, it had much more detail on the technical process, which I think HN will appreciate. https://news.ycombinator.com/item?id=49298723
It seems to have sunk. Sadly the window of opportunity is pretty small on HN.