What are the typical causes of spontaneous parametric down-converted photon-pair quantum state impurity when performing polarisation tomography?

We are performing polarisation quantum state tomography of photon pairs generated through spontaneous parametric down-conversion by following the approach described in this...

08 September 2014 653 6 View

Can metallic nano-particles be high-quality single-photon emitters (i.e. better than quantum dots)?

If no, why not? If yes, in which ways?

08 September 2014 5,623 5 View

How can RG factor be improved to become a proper measure of scientific reputation?

08 September 2014 5,747 0 View

How to build a successful academic career?

07 August 2014 5,872 16 View

Do you think tenure will/should be completely abolished in the future?

In some countries (for example Germany) academic tenure most of the time means a life-long position and a certain degree of freedom. In other countries (for example Australia) academic "tenure" in...

07 August 2014 6,504 6 View

How to switch from one area of research to a completely different one?

I've heard that up to 10% of PhD graduates manage to completely switch topics and even areas of science when starting their postdoc (i.e going from physics to medicine or from chemistry to...

07 August 2014 1,898 3 View

What is an intuitive way to understand nonlinear optical scaling?

It appears that the power-efficiency for second-order nonlinear optical processes is proportional to the square of the nonlinear interaction length along the propagation direction (~...

05 June 2014 9,369 3 View

How to Eliminate cosine error and abbe error in LASER measurement system(for example Rhenishaw XL80)?

I like to do project in laser measurement system. My objective is to eliminate or reduce the cosine error, abbe error in Laser measurement system. I have Rhenishaw XL80 system. Please tell the...

28 February 2021 4,890 3 View

How can we limit artifacts caused by rotation in fiber photometry?

We are trying to run fiber photometry experiments for long time scales, but we get these sinusoidal artifacts that come up. We think they may be caused by twisting of the fiber optic subject...

25 February 2021 568 1 View

How to measure angle between laser travel path and machine axis in Laser Measurement system?

25 February 2021 1,987 3 View

Can we recognize signs of the "volatility clustering" property of a time series in its time domain plot?

My purpose is to recognize the volatility clustering property without statistical tests such as The Lagrange Multiplier (LM) test.

24 February 2021 4,150 3 View

How can I simulate the optical absorption spectrum of a biomaterial (like DNA or protein) in COMSOL?

I need to simulate the optical properties of a biomaterial, namely DNA, in COMSOL. Basically I need to simulate the IR absorption spectrum of a cylinder filled with a 'concentration' of DNA. I am...

21 February 2021 3,043 3 View

How to overcome convergence issues in concrete arch models?

Hi, I have modelled a three-span arch bridge with soil fill over along with pedestals. The FE modelling is done in LUSAS with HX8M solid elements (i.e. 3D solid modelling). The non-linearity is...

20 February 2021 1,346 2 View

What is the reason of the received optical signal to be slimmed down in multi-mode fiber?

What is the reason of the received optical signal to be slimmed down in multi-mode fiber? I have 4 km multi-mode fiber

03 February 2021 1,105 10 View

What constraint can be used for rigid steel saddles and conrete beam under four point loading in ABAQUS?

Nodes are missing intersection with their respective master surface or outside the adjust zone, when using tie constraint.

01 February 2021 3,591 6 View

Why it is not permissible to correct all 5 classical optical aberration (spherical, chromatic, coma, astigmatism, curvature of field) simultaneously?

When first order paraxial optics is expanded to third order optics (i.e. sin x~ x-x3/3! instead of sin x~x) , these 5 optical aberrations result in. What is the rigorous mathematical proof that,...

26 January 2021 8,666 4 View

What stress-strain graphs do I put in a smeared concrete and steel reinforcement element in finite element analysis?

My SOLID65 element is reinforced concrete but what modulus of elasticity and material properties do I put? For nonlinear analysis

26 January 2021 1,704 3 View