Optical-caloric effect in diamond and vitreous silica

• Published in: Applied physics. A, Materials science & processing Vol. 128; no. 12
• Main Author: Tan, C. Z.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.12.2022; Springer Nature B.V
• Subjects: Applied physics; Characterization and Evaluation of Materials; Condensed Matter Physics; Cooling effects; Diamonds; Dielectric strength; Electromagnetic radiation; Glass fibers; Incident light; Light; Luminous intensity; Machines; Magnetic permeability; Magnetization; Manufacturing; Materials science; Nanotechnology; Optical and Electronic Materials; Permittivity; Physics; Physics and Astronomy; Polarization; Processes; Refractivity; Silica glass; Surfaces and Interfaces; Temperature dependence; Thin Films; Wave propagation; Waveguides; Heat capacity; Optical-caloric effect; Diamond, silica glass; Refractive index; Dispersion
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-022-06262-w

When an electric or magnetic field is applied to a dielectric material, it induces a change in the polarization or magnetization and temperature in the substance, which is known as the electro-caloric effect (ECE) or magneto-caloric effect (MCE) for static or low-frequency field. Light is an electromagnetic wave. The incident light inevitably causes the changes in polarization, magnetization, and temperature. This effect may be referred to as the optical-caloric effect (OCE). In this case, the OCE includes both ECE and the MCE. The polarization or magnetization is proportional to a dielectric constant, or the magnetic susceptibility at constant intensity of the incident light. Note the dielectric constant equals the square of the refractive index. The strength of the optical-caloric effect (SOCE) is related to the changes of the polarization and the magnetization with temperature, and is consequently associated with the changes of the refractive index and the magnetic susceptibility with temperature. It is found that the change of refractive index with temperature is proportional to the heat capacity, and the SOCS is a function of the temperature-dependent refractive index and the plasma and the resonance frequencies. The proposed approach is applied to study the OCE in diamond and silica glass. The SOCS is shown to be a negative value for both substances. This implies that a light cooling effect is induced by incidence of the light wave. The potential application of the OCE in the cooling technology benefits by propagating light waves through a waveguide and a glass fiber.