Episode 14 – Filters and Photodetectors

Image from Paper On Episode 14 of LASER we discuss using tree branches as water filters, a new type of super-thin room temperature infrared light detector that uses graphene, and the $1 Origami Microscope. 4:05 The article in Popular Mechanics titled “A simple tree branch can become a backyard water filter” and the FREE paper in PLOS One “Water Filtration Using Plant Xylem” 5:50 The idea is to help the developing world by testing a cheap water filter that only requires a tree branch and a tube 9:00 its really great when high school students get involved with university research projects and end up publishing papers! If you’re in high school you should talk to a university professor about helping out with a research project a couple of days after class. Even if you don’t plan to study science! (why would you not plan to study science?!) 12:00 Alex joins the group for the discussion! Unfortunately he hasn’t read any of the papers… 23:15 from Motherboard.vice.com we are talking about “infrared imaging may be coming to contact lens near you” and the article “Graphene photodetectors with ultra-broadband and high responsivity at room temperature” 24:30 the article is fine, but I don’t like the headline, and I think that the author of the paper somewhat misrepresented their results to the press. 25:45 a typical infrared detector is this Superconducting Edge Detector (or Transition Edge Bolometer) 27:00 Alex asks a good question about the superconducting principle behind how a transition edge sensor works. 35:40 Alex thinks his eyes are bizarre 38:42 the story is found in the MIT Technology Review and is “The $1 Origami Microscope” 41:00 there was a TEDx talk about this a few years ago, when it was a $0.50 cent microscope! Since that time, it costs more because they have developed methods for brightfield and darkfield imaging, and that required a few additional parts. 45:40 We talk about roll-to-roll processing and calendaring of green ceramics. These are manufacturing techniques for many materials. 48:05 Cameron said you can’t re-crystallize Al2O3 from amorphous to crystalline forms, but that is WRONG! Links to purchase the music used in this week’s episode: Intro: Open – Crying ( Get Olde ) Picture of a Tree That Doesn’t Look Okay – The World Is a Beautiful Place & I am No Longer Afraid to Die Amoeba – The Adolescents Outro: Dreams are Maps – The Wild ( Dreams are Maps )

You can listen to Episode 14 – Filters and Photodetectors online on Radio and Podcast. Open the player on this page to stream the available audio.

Episode 14 – Filters and Photodetectors is an episode from LASER: Materials Science Podcast by LASER: Materials Science Podcast.

This episode is 54:50 long.

This episode was published on Mar 26, 2014.

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