Ryan Freeman

9 Questions 15 Answers 0 Followers

Questions related from Ryan Freeman

How does 1D photonic crystal enhance field? Degenerate Band Edge?

Hi all, Looking at the wikipedia page for photonic crystals, there is a section that reads: "One-dimensional photonic crystals can include layers of non-linear optical materials in which the...

03 February 2022 3,148 5 View

What does the linewidth of an interference resonance indicate?

Cavity modes are a consequence of constructive interference of EM waves in a particular region. It is common knowledge that the (frequency) linewidth of a cavity resonance is broadened by both...

18 December 2019 2,912 6 View

How to think about rotation of spins?

I am aware that due to the properties of spinors, to return a spinor to its initial state by rotation, the spinor must be rotated by 4*pi radians, i.e. rotation by 720 degrees. While I was taught...

05 August 2019 5,962 4 View

Quantization axis for spins when no external magnetic field is present?

The underlying physics behind quantization axes for the electrons spin has never really been clear to me. I saw the Pauli matrices in my quantum courses, but the definition of different principle...

05 August 2019 6,646 3 View

How to remove oil in which sputtering targets are packed?

I've got a Tb (terbium) sputtering target that is packed in oil, due to it being reactive with air. What is the best way to remove the oil? I think dissolving the oil is better than simply...

06 July 2018 6,990 3 View

Purcell Effect: Why does the emission rate of an emitter depend on the strength of the electric field at the location of the emitter?

I'm trying to learn more about the Purcell effect and specifically how it relates to surface enhanced raman scattering (SERS). The Purcell effect, or 'modified spontaneous emission' occurs when...

25 June 2018 1,868 5 View

How do ohmic losses scale with frequency?

I feel like I've seen several different papers say that ohmic losses in metals become very large at: low frequency, high frequency, and at plasmonic resonances. Are all of these true, or am I...

12 September 2017 5,341 3 View

Can nanoscale split-ring resonators (SRR) be made to operate at GHz frequencies?

Split-ring resonators (SRR) are metamaterials whose geometry (shaped like the letter 'C') induces a magnetic response from incident EM radiation. At mm scale, these resonators show a magnetic...

12 September 2017 4,754 3 View

Why is breaking symmetry a pre-requisite to create effective magnetic fields in 2D, strong spin-orbit coupled systems?

I've read papers about the Rashba effect, Dresselhaus effect, and Dzyalonshinskii-Moriya Interaction but don't understand fundamentally why breaking spatial symmetry is a pre-requisite to see...

24 May 2016 6,107 3 View