Polarization

The human eye can see wavelengths of light that range from 380 to 700 nanometers, but the human body can feel parts of the electromagnetic spectrum that cannot be seen, such as infrared heat.

Linear polarization

Light is made up of waves. They wiggle as they zip through space. They can wiggle up and down, left and right, and any angle in between. Light is polarized when its waves all wiggle at the same angle.

Light sources from lamps to stars typically give off light waves that wiggle at a range of different angles. This jumble of waves is known as unpolarized light. Polarized light, on the other hand, is unjumbled: its waves all wiggle the same way, at the same angle. (For help picturing this, check out the artist’s depictions at 1:30 in this PBS video.)

For ideal health, we humans require regular exposure to light. A great example is Vitamin D which comes from sunlight. The sun’s n rays include the more commonly known ultraviolet light (UV), but more than half of its output is infrared. When it comes to visible light, violet-colored light produces the most energy, and red-colored light provides the least.

Electric polarization

Photobiomodulation therapy (PBM) uses red and near-infrared light to enhance cellular energy production, promoting faster healing and reducing inflammation. This non-invasive treatment is beneficial for pain relief, wound healing, skin health, brain function, and muscle recovery, with a strong safety profile and growing research backing its efficacy.

molecule: An electrically neutral group of atoms that represents the smallest possible amount of a chemical compound. Molecules can be made of single types of atoms or of different types. For example, the oxygen in the air is made of two oxygen atoms (O2), but water is made of two hydrogen atoms and one oxygen atom (H2O).

polarization极化

angle: The space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet.

Without tools like sunglasses, humans typically can’t detect the polarization of light. But other animals can. Examples include mantis shrimp, fiddler craps and some beetles, birds and fish.

Residing right next to near-infrared on the spectrum. Many red-light therapy systems use small amounts of infrared along with red LED lights, and as we’ve uncovered, infrared penetrates deeply while red light works on the surface of the skin. While penetrating the surface, this light energy works on rejuvenating facial skin, smoothing skin tone, building collagen, reducing wrinkles, and repairing sun damage. Experts say it can also assist in activating the lymphatic system, decreasing inflammation, fading scars, and stretch marks, and it may also assist with hair growth or loss prevention. How do you ask? Red light has been known to stimulate cellular processes in the skin and positively affect them by regenerating fibroblasts, keratinocytes, and skin tissue.

Many wellness services employ light or heat therapy; two of the most popular are red light therapy and infrared heat. Both infrared and red light therapy is becoming progressively popular in the spa, wellness, and beauty realms and is often confused. Still, they are different, and they do provide different benefits.

As you’ve noticed, there are similarities between infrared and red light. They are both natural, drug and chemical-free, non-invasive, effortless, safe, and users have reported no adverse short or long-term side effects. Actually, users report amazing effects! While both therapies are beneficial, the type you should choose depends on the outcome you desire. If you want to treat skin conditions on the surface, a red light session may be effective, but if the skin condition is high toxicity in the body, an infrared session may be required for toxin removal. An infrared session is a more holistic solution to wellness because it can provide skin rejuvenating benefits (like red light). Still, it can also help you burn calories, release toxins, ease pain, and put you in a state of utter relaxation.

polarization中文

Sunlight reflecting off water, for instance, can become polarized. The incoming light waves from the sun wiggle all different ways. But the light waves that bounce off the surface of the water are all mostly wiggling at the same angle. Pavement is another surface that can polarize reflected light.

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Red Light Therapy is viral for stimulating collagen production as the nanometers needed for collagen production are in the 700nm range. Because of its ability to assist with collagen production, those with arthritis may greatly benefit. Red light facials or body treatments are offered in salons, spas, and wellness centers to beautify the skin, relieve pain, increase immunity and stimulate feelings of positivity.

glare: Also called direct glare, it is light that travels directly from a light source and into someone’s eyes. It reduces the ability to see at night. Direct glare is one of three types of light pollution.

Circular polarization

Circularlypolarized light

Although infrared is classified as light energy, we don’t see it; we feel it as warmth. Because all humans produce infrared, it’s safe, natural, and easily absorbed by our tissues. During and after absorption, participants notice effects such as pain relief, increased circulation and blood flow, weight loss, detoxification, skin rejuvenation, relaxation, improved sleep, and more. Still, those are just a few of the benefits! For millennia, people worldwide have used infrared to improve their health and assist with boosting the metabolism, reducing inflammation, lowering side effects of diabetes, reducing allergy symptoms, improving heart function, and bettering their quality of life. How does infrared do it? When it enters the body, it breaks up fats and toxins trapped in water molecules, it makes us sweat to let them out, and therefore, an infrared session is one of the best ways you can naturally detox your body!

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refraction: The change in direction of light (or any other wave) as it passes through some material. For example, the path of light leaving water and entering air will bend, making partially submerged objects to appear to bend at the water’s surface.

The wavelength infrared puts out is longer than the wavelength of red light, allowing infrared to penetrate more deeply into the body. Thus, the reason infrared provides some similar but some completely different benefits than red light. The science behind these concepts has been around for centuries. In the 1800–the 1900s, physician, and scientist Niels Ryberg Finsen researched and successfully implemented light therapy to treat smallpox, later winning the Nobel Prize in Medicine and Physiology 1903 for his work. In 1910 John Harvey Kellogg also researched and wrote about red light and infrared heat benefits in his book “Light Therapeutics.” NASA then utilized red LED lights for plant growth on trips to space and noticed the astronauts also positively affected their mood, healing, and wound treatment. NASA also used infrared heat to provide the astronauts with cardiovascular conditioning, and since then, both have become available as effective wellness services.

filter: (n.) Something that allows some materials to pass through but not others, based on their size or some other feature. (v.) The process of screening some things out on the basis of traits such as size, density, electric charge. (in physics) A screen, plate or layer of a substance that absorbs light or other radiation or selectively prevents the transmission of some of its components.

Another way to polarize light is to pass it through a filter. Such filters are made up of molecules that are all aligned the same way. This allows only light waves wiggling at specific angles to pass through. For example, some sunglasses contain polarizing filters. These glasses help reduce the amount of reflected light — or glare — that reaches a wearer’s eyes. That can block out glare from roadways or puddles to help protect drivers’ eyes and allow them to see more clearly.

Tissues that don’t receive great circulation because they have been injured can benefit greatly as infrared heat can provide healing and skin regeneration. Infrared heat promotes the rebuilding of injured tissue by positively affecting the fibroblasts (connective tissue cells necessary for repair), increasing the growth of cells, and DNA and protein synthesis necessary during tissue repair and regeneration. This increased circulation, along with increased blood flow and oxygenation, can also provide relief for those experiencing chronic pain and other conditions.

As mentioned above, this spectrum classifies each form of energy by nanometers and its effect on the human physique. Nanometers are a unit of length equivalent to a billionth of a meter, and they are used to measure the wavelength of light. Since we’re comparing red light to infrared, it’s important to note their order on the spectrum.

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beetle: An order of insects known as Coleoptera, containing at least 350,000 different species. Adults tend to have hard and/or horn-like “forewings” which covers the wings used for flight.

Polarization oflight

Light can become polarized when reflecting off flat surfaces like puddles and pavement. Polarized sunglasses can then specifically block out those polarized light waves, reducing the glare that reaches a driver’s eyes.

Light can also become polarized as it passes from one type of material into another. This is a process called refraction. And light can become polarized when it bounces, or scatters off atoms as it passes through a substance. This happens to moonlight and sunlight that travels through Earth’s atmosphere.

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Maria Temming is the Assistant Managing Editor at Science News Explores. She has bachelor's degrees in physics and English, and a master's in science writing.

The intensity of light that is allowed to pass through the filter depends on the angle between the filter and wave's polarisation axis.

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Light can become polarized when it bounces off of a surface. The amount that it is polarized depends on the angle at which the light hits the surface. It also depends on what the surface is made of.

polarization: (in physics) The condition — or creation of a condition — in which rays of wavelengths of light exhibit different properties when viewed from different directions.

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mantis shrimp: A marine animal related to crabs and lobsters. Mantis shrimp use armlike body parts to kill prey. They are often multicolored and have a very complex vision system.

Each day we are surrounded by light energy, sometimes we see it, and sometimes we don’t. For centuries, great minds have theorized what it is, how it travels, and how it affects life on our planet. Ancient cultures, researchers, and philosophers came up with many concepts, but sometime in the 1860’s James Clerk Maxwell, a Scottish physicist, proposed the concept of electromagnetism. He concluded, because light moves in waves and does not need a medium to travel through, light must be made up of both electric and magnetic fields. This led to the discovery of electromagnetic radiation, the electromagnetic spectrum, and a way to measure light with its frequency and wavelength. The electromagnetic spectrum starts with safe radiation like radio, microwave, infrared, visible, and ultraviolet and ends with the not-as-safe x-ray and gamma rays.