View
476
Download
2
Category
Tags:
Preview:
DESCRIPTION
Revised version of talk given at Balticon this year (2013). To be delivered tomorrow at FOSSCON.
Citation preview
http://timeandquantummechanics.comInvisibility: Theory & Practice - FOSSCON, Aug 10th 2013
Invisibility:Theory & Practice
John Ashmead
Friday, August 9, 13
http://timeandquantummechanics.comInvisibility: Theory & Practice - FOSSCON, Aug 10th 2013
Invisibility:Theory & Practice
John Ashmead
Newly updated for FOSSCON!
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Transparent Motives
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Transparent Motives
•Wicked cool
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Transparent Motives
•Wicked cool
•Very practical: not just for war anymore!
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Transparent Motives
•Wicked cool
•Very practical: not just for war anymore!
•And of great scientific value
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Outline
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Outline
•A brief history of invisibility
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Outline
•A brief history of invisibility
•Reflections on materials
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Outline
•A brief history of invisibility
•Reflections on materials
•War, peace & the future
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
The Invisible Man
“If a sheet of glass is smashed, Kemp, and beaten into a powder, it becomes much more visible while it is in the air; it becomes at last an opaque white powder. This is because the powdering multiplies the surfaces of the glass at which refraction and reflection occur. In the sheet of glass there are only two surfaces; in the powder the light is reflected or refracted by each grain it passes through, and very little gets right through the powder. But if the white powdered glass is put into water, it forthwith vanishes. The powdered glass and water have much the same refractive index; that is, the light undergoes very little refraction or reflection in passing from one to the other.” -- Griffin…
“Yes, yes,” said Kemp. “But a man's not powdered glass!”
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Sucker Bet
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
The last cry you hear could be “Mimicry”
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
The last cry you hear could be “Mimicry”
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
The last cry you hear could be “Mimicry”
Yellow touches red, you be dead. Red touches black, eat Cracker Jacks.
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
The last cry you hear could be “Mimicry”
Yellow touches red, you be dead. Red touches black, eat Cracker Jacks.
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Spicebush swallowtail
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Spicebush swallowtail
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Camouflage
“The soldiers of France will never abandon their pantaloons rouge!”
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Camouflage
Modern camouflage began in 1915, when, after a crushing defeat by the Germans, the French army abandoned their stylish white gloves and red pantaloons and enlisted a cadre of artists to develop stealthier attire. The U.S. followed suit in 1917. In addition to hand-painted uniforms, these camoufleurs created false bridges, decoy tanks, and, as seen above, paper-mache horse carcasses that snipers used as blinds.
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Dazzle
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Dazzle
•Ships in WWI & WWII
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Dazzle
•Ships in WWI & WWII
•Confusion to the enemy
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Dazzle
•Ships in WWI & WWII
•Confusion to the enemy
•Moral boost at least
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Dazzle
•Ships in WWI & WWII
•Confusion to the enemy
•Moral boost at least
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Stealth
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Why so Boxy?
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Why so Boxy?
•Reflections angle away from source
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Why so Boxy?
•Reflections angle away from source
•Also, paint eats radar waves
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Why so Boxy?
•Reflections angle away from source
•Also, paint eats radar waves
•But, hard to fly
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Why so Boxy?
•Reflections angle away from source
•Also, paint eats radar waves
•But, hard to fly
•And, crashes a lot
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.comFriday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Pay no attention…
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Physics of invisibility
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Physics of invisibility
•Invisibility cloaks
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Physics of invisibility
•Invisibility cloaks
•Negative refractive indexes
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Physics of invisibility
•Invisibility cloaks
•Negative refractive indexes
•Metamaterials
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Physics of invisibility
•Invisibility cloaks
•Negative refractive indexes
•Metamaterials
•Optical transformations
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Physics of invisibility
•Invisibility cloaks
•Negative refractive indexes
•Metamaterials
•Optical transformations
•General relativity helps make it simple?
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Invisibility Cloaks
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Invisibility in Practice
“Invisibility is theoretically possible captain – the selective bending of light – but the power cost is enormous. They may have solved that problem”
– Lt. Cmdr. Spock
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Lighten Up!
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Lighten Up!
•Slow light
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Lighten Up!
•Slow light
•Light that goes faster than light
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Lighten Up!
•Slow light
•Light that goes faster than light
•Stopped light - light that doesn’t go at all
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Lighten Up!
•Slow light
•Light that goes faster than light
•Stopped light - light that doesn’t go at all
•Backwards light
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Cat’s eyes
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Cat’s eyes
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Cat’s eyes
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Fermat’s principle
Direct but slow
Faster
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Fermat’s principle
Direct but slow
Faster
Fastest!
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Simple Lens
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Lüneberg Lens
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
PositiveRefraction
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Negative Refraction
Friday, August 9, 13
http://www.loa.espci.fr/cargese2009/Cargese2009_Pendry.pdfInvisibility: Theory & Practice - FOSSCON, Aug 10th 2013
Time Reversal
Friday, August 9, 13
http://www.loa.espci.fr/cargese2009/Cargese2009_Pendry.pdfInvisibility: Theory & Practice - FOSSCON, Aug 10th 2013
Negative cancels positive
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Super lens
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.comFriday, August 9, 13
http://www.loa.espci.fr/cargese2009/Cargese2009_Pendry.pdfInvisibility: Theory & Practice - FOSSCON, Aug 10th 2013Friday, August 9, 13
http://www.loa.espci.fr/cargese2009/Cargese2009_Pendry.pdfInvisibility: Theory & Practice - FOSSCON, Aug 10th 2013Friday, August 9, 13
http://www.loa.espci.fr/cargese2009/Cargese2009_Pendry.pdfInvisibility: Theory & Practice - FOSSCON, Aug 10th 2013
Warping space
Friday, August 9, 13
http://www.loa.espci.fr/cargese2009/Cargese2009_Pendry.pdfInvisibility: Theory & Practice - FOSSCON, Aug 10th 2013Friday, August 9, 13
http://www.loa.espci.fr/cargese2009/Cargese2009_Pendry.pdfInvisibility: Theory & Practice - FOSSCON, Aug 10th 2013
Like water around a rock…
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Hiding a lump under the carpet
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Invisible Tanks
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Invisible Tanks
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Foreseeable Civilian Uses …
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
•Traffic light visibility
Foreseeable Civilian Uses …
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
•Traffic light visibility
•Earthquake & tsunami avoidance
Foreseeable Civilian Uses …
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
•Traffic light visibility
•Earthquake & tsunami avoidance
•Locating reactor core with muons
Foreseeable Civilian Uses …
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
•Traffic light visibility
•Earthquake & tsunami avoidance
•Locating reactor core with muons
•Tourist revenue enhancement…
Foreseeable Civilian Uses …
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Black holes in the laboratory
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Black holes as lenses
Einstein Rings
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Time Cloak
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Time Cloak
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
How to Vanish a Cat
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
How to Vanish a Cat
The apparatus uses the fact that the human eye can’t see phase information to help route light around the “space between”. With no need to preserve the phase, the design is much simpler!
Only works from a few directions, alas.
http://arxiv.org/abs/1306.1780
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Seeing the invisible
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Seeing the invisible
•It’s all about the math (really the information!)
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Seeing the invisible
•It’s all about the math (really the information!)
•Brains at play
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Seeing the invisible
•It’s all about the math (really the information!)
•Brains at play
•Any sufficiently advanced science will look like magic
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Be Seeing You
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Be Seeing You•Forbes - Dazzled & Deceived - 2009 [Fun]
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Be Seeing You•Forbes - Dazzled & Deceived - 2009 [Fun]
•Perkowitz - Slow Light: Invisibility, Teleportation, & Other Mysteries of Light - 2011 [Solid]
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Be Seeing You•Forbes - Dazzled & Deceived - 2009 [Fun]
•Perkowitz - Slow Light: Invisibility, Teleportation, & Other Mysteries of Light - 2011 [Solid]
•Beech - Physics of Invisibility: A Story of Light & Deception - 2011 [Lots of pictures]
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Be Seeing You•Forbes - Dazzled & Deceived - 2009 [Fun]
•Perkowitz - Slow Light: Invisibility, Teleportation, & Other Mysteries of Light - 2011 [Solid]
•Beech - Physics of Invisibility: A Story of Light & Deception - 2011 [Lots of pictures]
•Leonhardt - Geometry & Light: Science of Invisibility - 2010 [Brain-Frier]
Friday, August 9, 13
Invisibility: Theory & Practice - FOSSCON, Aug 10th, 2013 http://timeandquantummechanics.com
Be Seeing You•Forbes - Dazzled & Deceived - 2009 [Fun]
•Perkowitz - Slow Light: Invisibility, Teleportation, & Other Mysteries of Light - 2011 [Solid]
•Beech - Physics of Invisibility: A Story of Light & Deception - 2011 [Lots of pictures]
•Leonhardt - Geometry & Light: Science of Invisibility - 2010 [Brain-Frier]
Friday, August 9, 13
Recommended