Acoustic lensesAcoustic lens: a “lens” is a common device when we are talking about light. For example, a magnifying glass or the lenses used in spectacles to correct shortsightedness or in telescope objectives. An acoustic lens is a device that has the same effects, but for sound. A converging lens (for sound) would focus the emission of a loudspeaker in a spot. A diverging lens (for sound) might be used to send the high-frequency of a loudspeaker over large angles. More on lenses for light on Britannica Kids., which would not require electronics, were explored in the 1950s, but until a few years ago they remained bulky and were only practical for high-pitched sounds.
Which have small wavelengths (Figure 2D). The way we worked with sound was centuries behind the way we could work with light.” A second Spain phone number list team member interrupts, “But then, in 2011, scientists developed acoustic metamaterialsIt is a new type of materials, where the properties do not come from the chemistry of the base material, but from how it is engineered. The key point is that the engineering needs to be precise enough to work at a scale smaller than the wavelength. More on the definition of what is a metamaterial can be found here.
Like wood, plastic, or metal, engineered so that they can shape the sound that hits or passes through them. Metamaterials were first used to manipulate light in extraordinary ways—they can even make an object invisible! But use of metamaterials to manipulate sound will make a huge difference to our lives. Metamaterials now allow us to make acoustic lenses that can focus sound in a small spot, like the sun through a magnifying glass, and even acoustic holograms, which can bend sound waves into 3D complex shapes!” The referee is impressed. “That is amazing,” she says. “But what are acoustic metamaterials?” Welcome Metamaterials! Here is what Team Sound has to say: “Earlier, we talked about wavelength and how sound and light can be changed by interference and diffraction—by making light or sound waves bump into each other.