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Jul
13
comment Transmission vs reflection grating
I think no-one's answered this yet because it really depends on what you're trying to do with it. Can you make your question more specific?
Jun
25
awarded  Good Answer
Jun
20
awarded  Nice Question
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: