#material polarization

[dnieperrobot69420]

Status Update: Generalized Lorentz-Drude model of Dielectrics.

This week I continued to venture into the realm of nonlinearities by learning about the Lorentz model followed by the Drude model for metals.

It was fun employing the whole "statistical ensemble" trick to relate the microscopic dipole moments of individual atoms being subjected to an applied Electric Field to the macroscopic property of Material Polarization and further towards the Electric Flux Response of a material.

Once again, complex numbers rear their heads and there's growing pains in understanding the physical significance behind "complex dielectric" with the "real permittivity" all while trying to connect it with notions of conductivity in terms of both free space responses and material responses contributing to the total Electric Flux.

It is kinda neat how the complex refractive indexes extinction coefficient can be used to ??? Let us see where a materials absorption is highest near points of resonance?

And furthermore, a interesting connection to metamaterials was established when I realized that if the resonances of our doped elements are in frequencies way below our materials resonances, we do some cool stuff with the maths.

Something something we can use the dielectric permittivity at DC and at very high (infinity) to calculate the plasma frequency of a metal.

Now my plan is to deep dive into crystal anisotropy, do some numerical examples of tensor rotation, and hopefully that will help me better understand optical components like quarter wave plates and all that stuff.

And before anyone asks, no, Optical Rectification, the second order chi nonlinearity is NOT the mechanism of solar panels, that's the photoelectric effect 😉

[kirjavas]

reasons to watch hdm

protagonists are a young girl and a black teenage boy

several prominent male characters cry on screen

both protagonists are guided by their own goodness, and it is for this reason that they are the focus of the narrative

seeing the perspective of a child's view of the world vs the adults that disregard their voices

women in science

discussion of the morality of science co-existing with religion

female antagonists

teenage characters are played by teenagers of the same age

kids defeat evil through methods only children would use (snowball fights, screaming, hiding, running)

several black characters have a large role in the story, many in positions of authority and with independent character arcs

family is chosen but biological family can be just as powerful

very good casting/acting of family members down to certain mannerisms being mirrored by parents and children

solid good vs evil narrative but also everyone is morally ambiguous

it's a denouncement of organised religion while highlighting the value of faith

freedom of thought! truth! building paradise where you already are!

the title sequence goes incredibly hard

a love letter to the power of kindness and stories

Bear

[materialsscienceandengineering]

A beautiful blue butterfly wing offers a new way to study cancer

Shining polarized light through it and onto tissue can reveal how advanced the disease is

The morpho butterfly is a flying marvel. It flits through the rainforests of Central and South America. With wings that can span 20 centimeters (8 inches), it can be bigger than most human hands. Those wings shimmer with a dazzling blue hue. New data show these butterfly wings could one day become the basis of a new medical tool — one that might help doctors investigate the development and severity of some cancers. Although this butterfly’s wings are blue, that hue is not due to any pigment. Instead, it comes from how light reflects and refracts off tiny microstructures atop those wings. The shimmering color of the wing depends on how light hits it. (Many materials, from rocks to plastic wrap, have this property, called structural color.)

Read more.

[drawkaya]

Lyra

[full-of-terrors]

Credit for the list to @jesslovesboats

[storiesoflilies]

dash, toji fushiguro is a polar bear and PLEASE tell me you understand it too!!!!

[saints-who-never-existed]

"...Lady Franklin, having admitted that her husband was dead, contrived not only to vindicate him as an explorer, but to turn him into a national hero...using her status as an icon of fidelity, she achieved Franklin's apotheosis by acting in the domestic sphere, setting out deliberately to shape the collective memory of Arctic events. Franklin satisfied the English taste for martyrdom, for pairing bodily loss with spiritual gain and conquest with abnegation. Discovering the Northwest Passage was 'carefully redefined as an impalpable goal that did not require one to return alive, or to pass on the news to the world'. Navigability, obviously, no longer figured: discovering the Passage had become a moral enterprise, not a geographical one."

- Fatal Passage, Ken McGoogan

[rullikka]

Sabrina! your local lesbian polar bear!!

[albarrancabrera]

Albarran Cabrera   —–   Instagram

Opticks

Polarized #55006 Pigments, gampi paper and gold leaf

[noodlesarecheese]

Me: I really don't have time for a new writing project, I've got my hands full with work and the stuff I'm already writing.

My brain: Okay! Here's the entire plot of a multi-chapter www au!

[wxstelandermagneto]

Throws a hunk of copper, a non magnetic metal, at you

[Lifting a hand casually, the Master of Magnetism suspends the copper in the air with ease.]

Copper is not ferromagnetic - meaning a material is strongly attracted to magnetic fields, and can be permanently magnetized - it is diamagnetic - meaning it is repelled by them, often in such a way it is imperceivable under normal conditions. Such-as: the reputation.

[With a tense of his fingers, the hunk of copper sparks, then goes inert and falls into the palm of his hand.]

A simple mistake, really... but one that has led to the deaths of many-a-fool by my hand. I am trying to do better these days, so I'll leave you with your life.

[erio413]

I did this painting for my mom's birthday, because her name means bear princess (it's really cool and it's suits her very well!)

I don't really like how the painting turned out in the end, mainly because of the sky and the rays of light. It's the first time I've done this and it shows (in reality, it's the first time I've done mountains and a bear too, but they bother me less than the sky), but we all have to start somewhere, so here is my painting, I hope you like it anyway <3

[materialsscienceandengineering]

Beetle exoskeleton and conductive polymer create novel light-modulating material

Some beetles, such as Anomala albopilosa, strongly reflect left circularly polarized light (electromagnetic waves that oscillate leftward relative to the direction of light reception). This property originates from the formation of a cholesteric liquid crystal phase with an optically active, helical structure during chrysalis during exoskeleton formation and the solidification of this phase into a rigid skeleton while retaining its helical structure. Researchers at the University of Tsukuba have coated the surface of its exoskeleton with an electrically conductive polymer, polyaniline. The polymer does not reflect circularly polarized light; however, electrical or chemical oxidation of the polymer changes its coloration, thereby changing its light transmittance. By combining the color change caused by the oxidation and reduction of polyaniline with the exoskeleton's properties of reflecting circularly polarized light, the researchers have crafted a new polymer element that can modulate the reflection intensity of the circularly polarized light. The work is published in the journal Next Materials.

Read more.

[caityjay13]

Listen, I don't ship it (Bai-laoshi can do and deserves so much better), but this breakup scene is gold (episode 18).

*chef's kiss* Soap opera material.

[full-of-terrors]

In May 1845, Sir John Franklin, commander of HMS Erebus and HMS Terror, departed England to seek a navigable route across the top of the Americas. He and his 128 men never returned.

Four years later, Royal Navy Lieutenant Frederick Robinson and Assistant Surgeon Edward Adams are determined to find the men missing in the Arctic. While they are united in purpose, they are divided in ambition. The pious and idealistic Adams strives to save his boyhood hero. Robinson hungers for promotion through the Admiralty ranks. Weathering a relationship as volatile as the icy, barren land upon which they trek, Robinson and Adams lead a team of seamen in search of the lost expedition. What awaits them is a struggle against not only the elements but each other as loneliness, starvation, and maddening isolation prove more chilling than the deadliest Arctic blast.

A harrowing novel set against the background of true events, Bitter Passage explores two men’s driving need for redemption and the lengths to which a desperate soul will go to survive.

[abyssalpriest]

thinking about this art of Ahi again.