All Questions
124
questions
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52
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Michelson interferometer but with 1 arm (Part 2)
I designed a setup similar to Michelson Interferometer but with one mirror only. So, there is an angle between the 2 rays to the detector:
In order to understand the result on screen, I used (Zemax/...
- 81
0
votes
1
answer
57
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Interferometer designed to create diffraction in free space
I designed the following interferometer:
If the light beam -theoretically- is very narrow , will light be diffracted away from point B from QED's perspective?
- 81
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0
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12
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Collection efficiency of mirror
I want to compare plane and parabolic mirror for collection of photon from a point source. Intuitively, parabolic mirror focuses all rays from point source and gives parallel rays therefore has a ...
- 1
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0
answers
9
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Does the beam image invert on each round-trip through a hemispherical laser cavity?
When one creates a hemispherical laser cavity, using one flat and one concave mirror, does the beam image invert each time it makes a round trip? I know when passing through the focus of a lens/mirror,...
0
votes
1
answer
26
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The expression of photocurrent
Consider an electro-magnetic field represented in phasor notation $E_0e^{-jwt}$ incident upon a photodetector/photodiode, what is the expression of the generated photo-current $I(t)$? Here $E_0e^{-jwt}...
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5
answers
100
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How to rotate the polarization of photons?
What device is used to rotate photons from H to V. Does it change the energy of the photons? I heard about half wave plate?
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-1
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1
answer
22
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Transmittance of one material through a multilayer
Good morning,
I have the transmittance and the reflectance spectrum of PET (Polyethylene terephthalate) and I also have the transmittance and the reflectance spectrum of PET + Copper (50 nm). I would ...
- 31
2
votes
2
answers
91
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Why does Near Infrared (NIR) light allow deeper imaging in biological tissue in Multiphoton Microscopy?
I have been reading this paper on multiphoton microscopy (https://www.nature.com/articles/nphoton.an.2010.2) and I am very confused about something. Here is a quote from the paper:
"The NIR ...
- 21
0
votes
1
answer
38
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What is a true delay line and is there possibly a false delay line?
I'm reading "Silicon nitride passive and active photonic integrated circuits: trends and prospects" and one of discussed application of $\rm SiN$ is "true delay line". All the ...
- 3,034
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0
answers
33
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Missing Scaling Factor of the Electric Field of Hermite-Gaussian Modes
I am currently looking at A. Yariv's book "Introduction to Optical Electronics" 2nd edition. In Chapter 3 "Propagation of Optical Beams in Homogenous and Guiding Media", Yariv ...
- 31
1
vote
0
answers
57
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What's the difference between a rhombus lattice and a hexagonal lattice in photonics?
I am learning photonic crystal slabs. I try to figure out what the difference between a rhombus lattice and a hexagonal lattice in photonics is?
All I know is that they have diffefent Brillouin zones,...
- 11
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answers
57
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Waveguide allowed modes | Transverse resonance condition
Consider a planar waveguide for example. The guiding index is $n_f$, and the cover and substrate indices are $n_c$ and $n_s$ respectively. Let the waveguide propagate along z, and have a height $h$ in ...
- 23
1
vote
0
answers
13
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What photonic properties of a subwavelength plasmonic cavity make it generate saturated structural colour in just one layer?
I have a photonics question regarding a paper I am reading. Physics is not my area of study so please be kind :))
https://doi.org/10.1126/sciadv.adf7207
In this paper, the group has fabricated a self-...
- 11
0
votes
0
answers
116
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1D Photonic Crystal Photonic Bandgap Example Confusion
I am reading through Optoelectronics & Photonic Principles by Safa O. Kasap and am not understanding section 1.17 on Photonic Crystals. Here is an excerpt:
The book mentions how some waves suffer ...
- 21
2
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0
answers
38
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Relation between polarization and susceptibility for nonlinear processes
I've been confused about this for a while--
Boyd mentions that the second order polarization is related to second order optical susceptibility as $P_i(\omega_m + \omega_n) = \epsilon_0\sum_{(mn)}\chi_{...
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