Thermo optic metasurfaces material and its application
Answers
Answer:
Among the few parameters that can influence the dielectric permittivity (for example, pressure, electric or magnetic fields), temperature is probably the easiest to manipulate. The permittivity and refractive index of most materials are indeed temperaturedependent ( n T n T T ( ) [d d ] in the linear approximation, with dn/dT ≈ 10 −4 -10 −5 in dielectrics 18 ). This thermo-optical phenomenon (responsible for mirages) is used in a wide range of photothermal techniques, including photo-or thermoreflectance 19,20 , absorption spectroscopies 21,22 or nano-object detection 23,24 , to mention just a few
Answer:
material engineered to have a property that is not found in naturally occurring materials. They are made from assemblies of multiple elements fashioned from composite materials such as metals and plastics. The materials are usually arranged in repeating patterns, at scales that are smaller than the wavelengths of the phenomena they influence. Metamaterials derive their properties not from the properties of the base materials, but from their newly designed structures. Their precise shape, geometry, size, orientation and arrangement gives them their smart properties capable of manipulating electromagnetic waves: by blocking, absorbing, enhancing, or bending waves, to achieve benefits that go beyond what is possible with conventional materials.