Photomasks Explained (Contact and Projection): how to etch Thin Chromium Layers @HuygensOptics

Huygens Optics | Photomasks Explained (Contact and Projection): how to etch Thin Chromium Layers @HuygensOptics | Uploaded April 2019 | Updated October 2024, 3 hours ago.
In this video, the difference between contact/proximity masks and projection masks for photolithography is discussed. These masks are used to produce MEMs and integrated circuits. In the second half of the video, I will show how to quickly etch the chromium layer off a quartz substrate.

$Wave frequencies passing a grating This video shows a simulation of a transmissive grating on a glass plate that sends different wave frequencies in different angular directions. In the second part it show how it also does this if the incoming wave is a linear sum of 3 different frequencies. Thereby it performs a Fourier transform on the incoming wave signal (time domain) to intensity in an angular direction (a spectrum in the frequency domain) It was reuploaded because the original version contained an annoying error in the frequency indices. The Python code used for the wave simulation can be found on the @DiffractionLimited channel$ $Telescope Resolution vs. Aperture and Wavelength Discussion about of the fundamental limitations imposed by aperture and wavelength on the maximum sharpness of a telescope. By discussing the energy mechanisms behind diffraction, I try to explain why this relationship exists. In the last part I discuss the implications for the recently launched James Webb telescope. Contents: 0:00 Intro 2:43 Short experiment with aperture 4:47 About angular resolution 7:44 Resolution comparison of 3 different telescopes 10:13 Diffraction phenomena explained using energy as a basis 14:08 Experiment showing edge diffraction in real aperture 17:14 The James Web resolution explained using aperture and wavelength More about the background of the microscope experiment shown here is explained in this video: https://www.youtube.com/watch?v=TshYfYIxR9E Electromagnetic theory taken from Fundamental University Physics, Part 2: Electromagnetism by Marcelo Alonso and Edward J. Finn More information on the application of small telescopes can be found on the oresat.org website: http://oresat.org Aberrator 3.0 is a software program written by Cor Berrevoets to simulate star-images in different telescopes. It can be downloaded from aberrator.astronomy.net Where indicated, images from the NASA.gov website and Wikipedia.org were used. Link to the EON space labs pagina on LinkedIn: https://www.linkedin.com/in/eonspacelabs/ Image of Cubesat: https://www.satcatalog.com/component/6u-cubesat-platform-1117/ Huygens-Fresnel principle: https://en.wikipedia.org/wiki/Huygens%E2%80%93Fresnel_principle Do you like what I do and want to support it? Iv recently started a patreon page: https://www.patreon.com/huygens_optics REMARK: Huygens Optics has NO commercial ties with any of the products or companies featuring in this video. Everything shown is meant exclusively for educational purposes. Short third party clips are sometimes used, assuming fair use policy and always with a reference to the original source in the description. Did I forget you? Please let me know and I will set it straight$

Bathroom Quantum Fields and Vacuum Energy

Foucault test of 400 mm diameter spherical mirror (short video)

Optical Interferometry Part 1: Introduction & ZYGO GPI layout

$Optical Interferometry Part 2: Measuring Optics with a Zygo GPI LC This is the second video on optical interferometry, which is dedicated to measuring the wavefront shapes of a mirror, 2 lens assemblies and 3 microscope objectives. Contents: 00:00 Intro 02:04 Video camera upgrade 04:23 DFT-fringe software 06:57 Transmission Sphere reference calibration 12:29 Shape of a Zerodur Perkin Elmer wafer stepper mirror 14:55 Wavefront deformation of a Canon FD f/1.2 camera lens (1980) 18:10 Wavefront test of a modern Canon EF 24-105mm f/4 zoom lens 19:19 Microscope objective testing 22:44 Nikon Plan Fluor 10x / 0.30 23:17 Leica Fluotar 20x / 0.50 25:23 Nikon Plan APO 20x / 0.75 Link to Optical Interferometry Part 1: https://www.youtube.com/watch?v=l32_QbcdUiw&t=614s Link to the video on measuring MTF: https://www.youtube.com/watch?v=1AzQ4y_qwrM DFTfringe forum page: https://groups.io/g/Interferometry/topics DFT fringe download: https://github.com/githubdoe/DFTFringe/releases Dale Eason on YouTube: https://www.youtube.com/@UCPj57WFSSLpVqPir7Im-kiw lens config Canon F1.2 By Jake Low - Own work, CC BY-SA 4.0 (modified) https://commons.wikimedia.org/w/index.php?curid=75904563 Laser diffraction pattern By Wisky - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=15113998 Do you need to be referenced but I forgot to do that? Let me know and I will set it straight.$

Light & Coherence part 2: Spatial Coherence (and the Double Slit Experiment)

$Making Optical Logic Gates using Interference In this video I look into the idea of using optical interference to construct different kinds of logic gates, both from a conceptual- as well as from the practical perspective. Contents 0:00 Intro 2:15 Logic gate operation 3:36 Optical logic gates 4:45 Concept of a diffractive logic gate 7:52 Practical aspects (photolithography and etching) 8:46 Wave front observation method 9:20 Results 13:51 Possible applications Webpage with detailed and complete information on logic gates: http://www.ee.surrey.ac.uk/Projects/CAL/digital-logic/gatesfunc/index.html The diffractive patterns were made by using a home-brewed windows Zone plate app and then modifying them further with photoshop. The Zone Plate app can be downloaded from: http://www.huygensoptics.com/assets/zp_writer.zip For Windows 10 and for personal use only. Virus scanners and Windows will nag about it being a rare / unknown file and make installation sometimes difficult. Sorry about that. Install this app at your own risk. An overview article on various known optical logic gates can be found in this paper: https://www.hindawi.com/journals/aot/2014/275083/ However it does not contain any mention of the configuration described in this video The video contains references to detail videos on the following subjects: Photolithography: https://youtu.be/Lf-ev2Fop_k Chromium photomask etching: https://youtu.be/foMT8gLYxBY Other diffractive optics (photon sieves): https://youtu.be/TshYfYIxR9E Microscope viewing method: https://youtu.be/TshYfYIxR9E$