Skip to main content

Reset your password

Please enter the e-mail address you used to register to reset your password

Note: The verification e-mail to change your password should arrive immediately. However, in some cases it takes longer. Don't forget to check your spam folder.

If you haven't received the e-mail in 24 hours, please contact customerservices@ioppublishing.org

Registration complete

Thank you for registering with Physics World
If you'd like to change your details at any time, please visit My account

Close
Optical physics

Optical physics

Structured photons slow down in a vacuum

22 Jan 2015
Photograph of a burst of light
Easy does it: structured light slows in vacuum (Courtesy: iStockphoto/7io)
  The speed of light in a vacuum is 299,792,458 m s–1, right? Not necessarily, according t

You’ve reached the limit of what you can view on Physics World without registering

If you already have an account on Physics World, then please sign in to continue reading

If you do not yet have an account, please register so you can

  • Access more than 20 years of online content
  • Choose which e-mail newsletters you would like to receive

Jon Cartwright is a freelance journalist based in Bristol, UK
Read previous

Cellular model of tissue growth could shed light on metastasis
Read next

Rosetta data deluge reveals dynamic comet with sand dunes and jets

Discover more from Physics World

Related jobs

Related events

Copyright © 2025 by IOP Publishing Ltd and individual contributors