What are plasmons?
A plasmon is a quantum of plasma oscillation, just like photon is a quantum of light radiation.
Plasmon is a quasiparticle resulting from the quantization of plasma oscillations.
Plasmons play a large role in the optical properties of metals. Light of frequency below the plasma frequency is reflected, because the electrons in the metal screen the electric field of the light. Light of frequency above the plasma frequency is transmitted, because the electrons cannot respond fast enough to screen it. In most metals, the plasma frequency is in the ultraviolet, making them shiny (reflective) in the visible range.
[gview file=”http://www.photonics.ethz.ch/fileadmin/user_upload/optics/Courses/NanoOptics/plasmons.pdf”]
Surface plasmons
Surface plasmons are those plasmons that are confined to surfaces and that interact strongly with light resulting in a polariton
Read more at http://en.wikipedia.org/wiki/Surface_plasmon
[gview file=”http://www.optics.rochester.edu/workgroups/novotny/courses/OPT463/plasmonss.pdf”]
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Nuclear Fission and Fusion – A Facebook conversation
Find below a conversation between Master Deepak, PUC student and Mr. Mathew Abraham, Physics teacher.
Deepak asked: “nuclear fusion or fission in which of these energy released is more and why?”
Nuclear fusion requires very high temperature to start. It is difficult to maintain such a huge temperature (of the order of million degrees).
Research is going on to construct nuclear fusion reactor
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What is Pseudo force?
What is Pseudo force? Asked Rahul Answer: The word pseudo means false. Remmeber pseudopodia, the false legs of amoeba.(Also called fictitious force,or phantom force) An additional force due to nonuniform relative motion of two reference frames is called a pseudo-force. A pseudoforce does not arise from any physical interaction between two objects, but rather from the acceleration a of the non-inertial reference frame itself. A fictitious force on an object arises when the frame of reference used to describe the object’s motion is accelerating compared to a non-accelerating frame.
[gview file=”http://www.askphysics.com/wp-content/uploads/2013/09/pseudoforce.pdf”]
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