Questions tagged [photonics]
Photonics is the science of creating, moving, and detecting photons
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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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How to get good visibility in Single-photon_interference?
This question is specific to the experimental quantum optics community. I am attempting to perform a Mach-Zehnder interference experiment using single photons as a source. However, I am encountering ...
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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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Can there be two different physical units (or dimensions) for a same physical quantity?
I was going through this book "Nonlinear optics" by Robert W. Boyd for my postgraduate subject in Nonlinear optics and I came across the different orders of nonlinear susceptibilities. From ...
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Mode Interferometers (MMI) versus waveguide couplers
In Photonics Integrated Circuits Mach-Zender (MZ) modulators are very often used. This design splits one wageguide into two spatially separated waveguides and makes them to rejoin, in order to ...
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Are there any nonlinear crystals or other transparent materials that can produce anti-Stokes, phase matched, frequency shift of laser light?
While some nonlinear crystals can convert incoming laser light into harmonics, thus for example doubling the light frequency, are there any crystals or other transparent materials that can reduce the ...
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Photon as a qubit
I am studying Quantum Key Distribution which relies on photonic qubits, the photon.
Indeed, this one is viewed as a qubit, that is a two state system, just like the
spin of an electron, an atom with ...
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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 ...
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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 ...
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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 ...
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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 ...
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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,...
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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 ...
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Effective Refractive index of a mode less than that of the cladding refractive index?
Can the effective refractive index be less than the cladding if the waveguide width is very small. For example for the case of a ~100 nm waveguide.
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Non-Linear Crystals (BBO) splitting photons
So from what I've studied till now about Photon Entanglement is that when we input a photon of a particular wavelength ($\lambda$) into a BBO crystal (a non linear $\chi^2$ crystal), it has a ...
