Abstract
As the display industry continues to advance, various new materials are being developed for utilizing microtechnology and nanotechnology in display panels. Among these, transparent materials have been widely applied to the internal wiring of displays and flexible substrates, owing to their high optical transmittance, isotropy, and anisotropy. Thus, measurement of the thermophysical properties of various transparent materials is important. This study measured thermal conductivity by selecting quartz, a transparent isotropic material, and sapphire glass, a transparent anisotropic material, as measurement target materials using a rear-side photothermal deflection method. Measurements were made via a three-dimensional unsteady heat conduction equation, to which complex transformation was applied and numerically analyzed using COMSOL Multiphysics. Phase delays for a pump beam and a probe beam for a relative position were derived through a deflection analysis. From the derived phase delays between the numerical analysis and experimental result with optical alignment, the absolute and relative errors of quartz were appropriately confirmed to be 0.069 W/m-K and 5%, respectively, while those of the sapphire glass were likewise confirmed to be 0.55 W/m-K and 1.5%, respectively.
Highlights
Using Equation (1), the optical absorption length was determined to be as short as 16.31 nm, implying that the entire energy of the pump beam could be absorbed by the surface of the metal film
When the probe beam passes through the temperature gradient of the bottom air layer of the specimen, deflection optical absorption coefficient of 6.1310 10 cm [32]
This study aimed to measure the thermal conductivity of transparent materials by This aimed to measure the thermalmethod, conductivity of transparent by using thestudy rear-side photothermal deflection selecting quartz as amaterials transparent using the rear-side photothermal deflection method, selecting quartz as a transparent isoisotropic material and sapphire glass as a transparent anisotropic material
Summary
The light film sufficiently absorbs the energy of the pump beam regardless of the optical and thermal characteristics of the target materials. This was achieved by using copper, which is known to have an optical absorption coefficient of 6.1310 × 105 cm−1 [32]. The conduction causes a periodic temperature gradient in the target materials and in the layers of air at the top and bottom. When the probe beam passes through the temperature gradient of the bottom air layer of the specimen, deflection optical absorption coefficient of 6.1310 10 cm [32]. When the probe beam passes through the temperature gradient of the bottom air layer of the specimen, deflection is generated . The deflection angle (Φ) for the orientation of irradiating probe beam be expressed
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