2,788 reputation
1325
bio website nl.linkedin.com/in/…
location Canada
age 33
visits member for 4 years, 10 months
seen 16 hours ago

Aug
11
comment Can someone please explain extraordinary optical transmission (EOT)?
That paper is also behind a paywall. But my thoughts on the matter are that diffraction and surface plasmons are the same thing, in the end. Diffraction at the edges causes some light to enter a surface plasmon mode.
Aug
10
comment Transmission of light, sub-wavelength apertures, and cut-off frequencies
I don't know of any free waveguide resource, but Wikipedia is always a good place to start. If you have another question then it's best to open a new question so that others can discover it as well. However, the short answer is that the propagation constant depends on the metal, the aperture medium, and the geometry of the aperture.
Aug
9
comment Blazed phase profile to generate laguerre gaussian beam
Mathematically? Or literally, how to manufacture it?
Jun
13
comment Momentum change of a photon upon diffraction at a grating
That would be explained in the answer that I originally thought was a duplicate of this one. The wave vector is modified when the light is diffracted by the grating.
Jun
10
comment does photon travels in a helical path in an optical vortex?
Although, the ring is an eigenfunction of the Fourier transform, but a small arc of it is not, so the small arc will not remain invariant during propagation...
May
29
comment difference between plasmonic wave plates and usual wave plates
I'm not sure what you're asking here. Plasmonic waveplates are different from birefringent glass ones, because they work according to a different mechanism. What is it you want to know about them?
Apr
24
comment Is there any review paper on spatial light modulator?
I don't know of a review paper, but I have a technical report from quite a while back, about characterizing a micro mirror array, which is a specific type of spatial light modulator.
Mar
8
comment Resonant vs. Non-resonant Raman
I have never known for sure, but I suspect it is because the molecule is more likely to absorb and re-emit photons at those frequencies on the whole.
Jan
22
comment How to measure the size of a laser dot?
If you can pry the lens off the front of the camera, there is an easier way to get the size of the pixels on the sensor: illuminate the sensor directly with the beam, place a screen at a known distance from the sensor, and measure the distance (and therefore the angle) between the spots in the back-reflected diffraction pattern.
Nov
13
comment Do TN and IPS displays are subject to diffraction?
Don't overestimate others' familiarity with what seems easy to you. I learned what TN means long after I learned what a display is, and I have no idea what IPS is.
Oct
11
comment Collinearity of two infrared (10.6um) beams
While you're on the subject of safety, I'd suggest having the combined beam travelling horizontally, not upwards!
Sep
16
comment Transfer matrices - drift distances
I was thinking that would only work if $d$ was large compared with the difference in thickness due to the curvature of the lens; otherwise $d$ would not be constant in the distance from the optical axis, and so the transfer matrix would not work.
Aug
25
comment Why is optical orbital angular momentum (OAM) called “topological charge”?
Something else to point out is that the topological charge can be positive and negative and also adds up like electrical charge.
Jun
15
comment Third-order susceptibilities of metals?
Cu nanocrystals embedded in glass, though, wouldn't be able to tell much about the solid metal, right?
Mar
13
comment Getting nonphysical results when solving for the index of refraction of a slab?
I was giving you long conjectures in the comments and finally I decided to stop conjecturing and make a real answer out of it ;-)
Mar
12
comment Getting nonphysical results when solving for the index of refraction of a slab?
What @SteveB says: It would not be at all surprising for this kind of data to be systematically shifted up or down a bit compared to reality. This has happened to me many times.
Mar
11
comment Getting nonphysical results when solving for the index of refraction of a slab?
How did you normalize your R and T measurements? Out of curiosity, what happens with the computed n if you add an offset of 0.2 to either?
Mar
5
comment Optics - Faraday Rotator using waveplates
You can't. Waveplates are reversible, a Faraday rotator is not.
Dec
13
comment Why is the decibel scale logarithmic?
That's incorrect, the decibel scale is logarithmic: +10 dB gives 10x the sound pressure (and +3 dB gives about 2x, as you say) so +20 dB (100-80) gives 100x. In other words, $2^{(100-80)/3} \approx 100$.
Dec
12
comment Exciting Surface Plasmon-Polaritons with Grating Coupling
Take $\theta_o = \pi/2$, so the grating equation becomes $d(\sin\theta+1)=\nu\lambda$. Then $k=2\pi/\lambda$, and $g=2\pi/d$. The difference between $k$ and $\beta$ is because $\lambda$ is different for the surface plasmon.