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bio website nl.linkedin.com/in/…
location Canada
age 32
visits member for 3 years, 5 months
seen 19 hours ago

May
12
comment What's the physical significance of using fourier transform for diffraction?
I wrote an answer about that here a while ago...
Mar
21
answered Trapping EM radiation
Feb
28
comment Rubber band stretched produces heat and when released absorbs heat.. Why?
@Nathaniel My final term freshman year project in university was to build one of those. It's been a long time so I don't remember the details, and I think I lost the project report :-P We insulated the water in a styrofoam container to keep the environment from warming it up too much, and it got quite cold to the touch. We weren't able to get it anywhere near freezing though.
Feb
23
comment Optical trapping problem
You've got the wrong idea about optical trapping. Or perhaps you're referring to something I've never heard of? Can you elaborate?
Feb
9
awarded  Tumbleweed
Jan
28
answered How to determine real part of optical conductivity by reflectivity measurements?
Jan
27
comment Spectral luminous efficiency as a function of wavelength
Do you have a reliable source for that?
Jan
4
comment Why doesn't my pinhole camera work?
+1 for doing your own experiment though!
Dec
6
awarded  Enlightened
Dec
6
awarded  Nice Answer
Dec
4
answered Angle of rays leaving a light source
Dec
4
awarded  Constituent
Nov
27
awarded  Caucus
Nov
20
awarded  optics
Nov
19
revised Photon energy - momentum in matter
expanded answer to include Abraham-Minkowski controversy and microscopic picture
Nov
19
comment Photon energy - momentum in matter
actually, three: 1) $p=\hbar k$ is only valid for a photon in a plane wave mode, which people usually gloss over; 2) saying that phase matching is due to conservation of momentum is not accurate, despite it being popular to say in nonlinear optics; 3) of course you are right that the photon is traveling mostly in vacuum and so has $p=h\nu/c$; but that expression is useless at the scale of macroscopic dielectric media.
Nov
19
comment Photon energy - momentum in matter
I've thought and discussed about it some more and come to two insights:
Nov
19
comment Photon energy - momentum in matter
Indeed, the Abraham-Minkowski controversy is divided between whether the momentum of a single photon is larger or smaller in a dielectric, but it certainly doesn't stay the same!
Nov
19
comment Photon energy - momentum in matter
@MarkMitchison I'm aware that photons appearing to travel slower in water is purely due to averaging. However, the momentum of a single photon is h-bar times the wave vector, and the wave vector's magnitude is larger in a denser medium with a slower speed of light. This is how phase matching works in nonlinear optics - conservation of momentum. Also, surface plasmon resonance excitation mechanisms (such as the Kretschmann configuration) are explained by different photon momenta in different materials.
Nov
18
answered Photon energy - momentum in matter