Archive for light

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1822 – Louis Pasteur – bio

Louis Pasteur was born in 1822 in France and is known for discovering pasteurization (heating beverages to kill bacteria in them) and vaccination. Vaccination is the process of exposing a patient to a vaccine, which causes a low level infection, stimulating the immune system to develop antibodies, creating an immunity against the disease. He explained […]

Quintessence Means Fifth Element

FOUR ELEMENTS Plato defined four basic elements as earth, water, air, and fire. In his analysis of geometry he defined five regular solids. He paired up the four elements with four of the five regular solids and this suggested to him that there might be another element. He assigned earth to the cube, water to […]

Photonic Crystal Fibers

Photonic crystal fibers (PCFs) are microstructured optical fibers that use tiny air hole capillaries arranged in a pattern around the center of the fiber. This makes the light propagation far superior to conventional fibers, requiring fewer repeaters and less amplification over long distances. PCFs are also capable of handling high energy lasers efficiently. What is […]

Plasmons Used in Optical Communications

When ripples in the fluid-like free electrons in conducting metals form oscillations, they can act like virtual particles and are called “plasmons”, a category of quasiparticles. Controlling plasmons which interact with light allows fast and efficient modulation of light based communications. What is a plasmon? – [] A plasmon is a collective excitation of the […]

1170 – Robert Grosseteste – bio

Born around 1170 in Suffolk, England, Robert Grosseteste was a student of many subjects who became a bishop in the Church of England. He was proficient in the Greek language, translating many works into Latin. He performed experiments with light and mirrors and made lenses from bowls filled with water to study refraction. His investigation […]

Superconducting Islands Amplify Photon Pressure

The ripple in space that we call a photon, or wave/particle of light, does have some mass, but it is so small that is almost zero. It normally takes millions of photons just to measure any impact at all. Joint research based in Finland shows that an island of superconductivity can amplify the ability to […]

Colloidal Camouflage

Cuttlefish dynamically change both the color and texture of their skin to create camouflage that matches the environment around them. A University of Nebraska research team is doing the same thing using colloids in a multilayered structure. When light hits the colloid layer, heat convection reassembles it to replicate the light pattern. This technique is […]

CLIP = Continuous Liquid Interface Production

3D printing has taken a revolutionary step forward with a continuous printing technique that draws material from a liquid pool, controlled with a pattern drawn by light. The CLIP process lifts a forming object from a pool of resin while a beam of light controls the formation by projecting a sequence of images on the […]

Lightbulbs Are Becoming Obsolete

Organic Light Emitting Diodes (OLEDs) can be used to create light emitting surfaces instead of lights that emit from a single point like bulbs. This makes the light more diffuse and more power efficient. Current OLED surfaces are made in panels or sheets, but eventually could be included in many surfaces in household items, like […]

Print Your Own Invisibility Cloak

Duke University researchers are using 3D printers to produce working microwave cloaking materials. They suggest it’s not a difficult step to move toward printing with polymers or glass that might cloak visible light. Do-It-Yourself Invisibility with 3-D Printing – [] Seven years ago, Duke University engineers demonstrated the first working invisibility cloak in complex laboratory […]