Invisibility: Theory & Practice

http://timeandquantummechanics.comInvisibility: Theory & Practice - Balticon, May 25th 2013

Invisibility:Theory & Practice

John Ashmead

Monday, June 3, 13

http://timeandquantummechanics.comInvisibility: Theory & Practice - Balticon, May 25th 2013

Invisibility:Theory & Practice

John Ashmead

And catch “Your Lying Eyes” with Stephen

Grande at 5pm!

Monday, June 3, 13

Invisibility: Theory & Practice - Balticon, May 25th 2013 http://timeandquantummechanics.com

Transparent Motives

Monday, June 3, 13

Transparent Motives

•Wicked cool

Monday, June 3, 13

Transparent Motives

•Wicked cool

•Very practical: not just for war anymore!

Monday, June 3, 13

Transparent Motives

•Wicked cool

•Very practical: not just for war anymore!

•And of great scientific value

Monday, June 3, 13

Outline

Monday, June 3, 13

Outline

•A brief history of invisibility

Monday, June 3, 13

Outline

•Reflections on materials

Monday, June 3, 13

Outline

•Reflections on materials

•War, peace & the future

Monday, June 3, 13

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!"

Monday, June 3, 13

Sucker Bet

Monday, June 3, 13

The last cry you hear could be “Mimicry”

Monday, June 3, 13

Yellow touches red, you be dead. Red touches black, eat Cracker Jacks.

Monday, June 3, 13

Yellow touches red, you be dead. Red touches black, eat Cracker Jacks.

Monday, June 3, 13

Spicebush swallowtail

Monday, June 3, 13

Spicebush swallowtail

Monday, June 3, 13

Camouflage

“The soldiers of France will never abandon their pantaloons rouge!”

Monday, June 3, 13

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.

Monday, June 3, 13

Dazzle

Monday, June 3, 13

Dazzle

•Ships in WWI & WWII

Monday, June 3, 13

Dazzle

•Confusion to the enemy

Monday, June 3, 13

Dazzle

•Moral boost at least

Monday, June 3, 13

Dazzle

•Moral boost at least

Monday, June 3, 13

Stealth

Monday, June 3, 13

Why so Boxy?

Monday, June 3, 13

Why so Boxy?

•Reflections angle away from source

Monday, June 3, 13

Why so Boxy?

•Also, paint eats radar waves

Monday, June 3, 13

Why so Boxy?

•But, hard to fly

Monday, June 3, 13

Why so Boxy?

•But, hard to fly

•And, crashes a lot

Monday, June 3, 13

Invisibility: Theory & Practice - Balticon, May 25th 2013 http://timeandquantummechanics.comMonday, June 3, 13

Pay no attention…

Monday, June 3, 13

Physics of invisibility

Monday, June 3, 13

•Invisibility cloaks

Monday, June 3, 13

•Negative refractive indexes

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•Metamaterials

Monday, June 3, 13

•Metamaterials

•Optical transformations

Monday, June 3, 13

•Metamaterials

•Optical transformations

•General relativity helps make it simple?

Monday, June 3, 13

Invisibility Cloaks

Monday, June 3, 13

Out of mind, out of sight

Monday, June 3, 13

"Of course: I've been investigating the mystical causes of invisibility when I should have looked at the quantum mechanical!" – Rupert Giles

Monday, June 3, 13

"Of course: I've been investigating the mystical causes of invisibility when I should have looked at the quantum mechanical!" – Rupert Giles

"I think I speak for everyone here when I say 'huh?'" – Buffy Summers

Monday, June 3, 13

Lighten Up!

Monday, June 3, 13

Lighten Up!

•Slow light

Monday, June 3, 13

Lighten Up!

•Slow light

•Light that goes faster than light

Monday, June 3, 13

Lighten Up!

•Slow light

•Stopped light - light that doesn’t go at all

Monday, June 3, 13

Lighten Up!

•Slow light

•Stopped light - light that doesn’t go at all

•Backwards light

Monday, June 3, 13

Cat’s eyes

Monday, June 3, 13

Cat’s eyes

Monday, June 3, 13

Cat’s eyes

Monday, June 3, 13

Fermat’s principle

Direct but slow

Faster

Monday, June 3, 13

Fermat’s principle

Direct but slow

Faster

Fastest!

Monday, June 3, 13

Simple Lens

Monday, June 3, 13

Lüneberg Lens

Monday, June 3, 13

PositiveRefraction

Monday, June 3, 13

Negative Refraction

Monday, June 3, 13

http://www.loa.espci.fr/cargese2009/Cargese2009_Pendry.pdfInvisibility: Theory & Practice - Balticon, May 25th 2013

Time Reversal

Monday, June 3, 13

Negative cancels positive

Monday, June 3, 13

Super lens

Monday, June 3, 13

Invisibility: Theory & Practice - Balticon, May 25th 2013 http://timeandquantummechanics.comMonday, June 3, 13

http://www.loa.espci.fr/cargese2009/Cargese2009_Pendry.pdfInvisibility: Theory & Practice - Balticon, May 25th 2013Monday, June 3, 13

Warping space

Monday, June 3, 13

http://www.loa.espci.fr/cargese2009/Cargese2009_Pendry.pdfInvisibility: Theory & Practice - Balticon, May 25th 2013Monday, June 3, 13

Like water around a rock…

Monday, June 3, 13

Hiding a lump under the carpet

Monday, June 3, 13

Invisible Tanks

Monday, June 3, 13

Invisible Tanks

Monday, June 3, 13

Buffy must explain to Willow and Amy that their invisibility spell doesn't work so well with clothes on

Monday, June 3, 13

•Traffic light visibility

Monday, June 3, 13

•Earthquakes avoidance

Monday, June 3, 13

•Earthquakes avoidance

•Locating reactor core with muons

Monday, June 3, 13

Black holes in the laboratory

Monday, June 3, 13

Black holes as lenses

Einstein Rings

Monday, June 3, 13

Time Cloak

Monday, June 3, 13

Time Cloak

Monday, June 3, 13

Seeing the invisible

Monday, June 3, 13

•It’s all about the math

Monday, June 3, 13

•Brains at play

Monday, June 3, 13

•Brains at play

•Any sufficiently advanced science will look like magic

Monday, June 3, 13

Be Seeing You

Monday, June 3, 13

Be Seeing You•Forbes - Dazzled & Deceived - 2009 [Fun]

Monday, June 3, 13

•Perkowitz - Slow Light: Invisibility, Teleportation, & Other Mysteries of Light - 2011 [Solid]

Monday, June 3, 13

•Beech - Physics of Invisibility: A Story of Light & Deception - 2011 [Lots of pictures]

Monday, June 3, 13

•Leonhardt - Geometry & Light: Science of Invisibility - 2010 [Technical]

Monday, June 3, 13

•Leonhardt - Geometry & Light: Science of Invisibility - 2010 [Technical]

Monday, June 3, 13

Invisibility: Theory & Practice

theory practice balticon

theory practicejohn

white powdered glass

wwi wwiiconfusion

thesheet of glass

notpowdered glass

comthe invisiblemanif

anopaque white powder

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