Reflection characteristics of PET gold-plated film under different wavelengths of light

PET gold-plated film, as an important optical material, has broad application prospects in many fields, such as optoelectronic displays, optical sensing, and optical communication. Its unique metal coating structure endows it with special optical properties, among which reflection characteristics are particularly critical. When different wavelengths of light interact with PET gold plating film, complex and diverse reflection behaviors are exhibited due to factors such as the physical structure of the film layer, the thickness of the gold layer, and the characteristics of the PET substrate. Advanced Institute (Shenzhen) Technology Co., Ltd. is committed to developing high-quality products PET gold-plated filmStudying the reflection characteristics of the product under different wavelengths of light can help further optimize its performance and expand its application range.

PET gold plating film is usually composed of a PET substrate and a gold coating on the surface. PET substrates have good mechanical properties, chemical stability, and optical transparency, providing stable support for gold coatings. The gold coating is formed by depositing gold atoms on the surface of PET substrate through specific coating processes, such as vacuum evaporation or sputtering coating. The thickness of the gold layer is generally between tens of nanometers and hundreds of nanometers, and precise control of its thickness has a significant impact on the reflection characteristics of PET gold plating film. Advanced Institute (Shenzhen) Technology Co., Ltd. adopts advanced coating technology to precisely control the thickness of the gold layer, ensuring product consistency and high performance.

In order to study the reflection characteristics of PET gold plating film under different wavelengths of light, we have built a professional optical measurement system. The system uses an adjustable wavelength light source, which can cover a wide spectral range from ultraviolet light (200nm -400nm) to visible light (400nm -760nm) and then to near-infrared light (760nm -2500nm). The light is collimated and vertically irradiated onto the surface of the PET gold-plated film sample, and the reflected light is collected and analyzed by a spectrophotometer. By measuring the intensity and phase information of reflected light at different wavelengths, we can obtain the reflectance curve of PET gold plating film as a function of wavelength. During the experiment, we tested multiple sets of PET gold-plated film samples produced by Advanced Institute (Shenzhen) Technology Co., Ltd. with different gold layer thicknesses to comprehensively investigate the effect of gold layer thickness on reflection characteristics.

In the ultraviolet region, due to the strong absorption and scattering of ultraviolet light by gold atoms, PET gold-plated filmThe reflectivity is relatively low. As the wavelength gradually increases from 200nm to 400nm, the reflectivity shows a slow upward trend. For example, when the thickness of the gold layer is 50nm, the reflectivity at 200nm wavelength is about 20%, and the reflectivity increases to about 30% at 400nm wavelength. This is mainly because as the wavelength increases, the absorption of light by gold atoms gradually weakens, and more light is reflected back.

Entering the visible light region, the reflection characteristics of PET gold plating film become more complex. In the blue-green light range of 400nm to 550nm, there is a relatively low valley in reflectivity. For samples with a gold layer thickness of 100nm, the reflectivity can be as low as about 35% at a wavelength of 480nm. This is due to the special interaction between the plasmon resonance effect of the gold layer and light in the vicinity of this wavelength band, where some energy is coupled into the plasma oscillation inside the gold layer, resulting in a decrease in reflected light. In the red and yellow light bands of 550nm to 760nm, the reflectivity gradually increases, and at 760nm, the reflectivity can reach between 45% and 55%, showing a good reflection effect.

In the near-infrared region, PET gold-plated filmThe reflectivity continues to increase with the increase of wavelength. When the wavelength reaches 2500nm, for a sample with a gold layer thickness of 200nm, the reflectivity can reach over 80%. This is because at long wavelengths, the free electrons in the gold layer dominate the reflection of light, and as the wavelength increases, the interaction between light and the gold layer becomes more in line with the classical reflection theory model, resulting in a continuous increase in reflectivity.

The thickness of the gold layer is one of the key factors affecting the reflection characteristics of PET gold plating film. Thinner gold layers may exhibit lower reflectivity at short wavelengths due to discontinuities, while as the thickness of the gold layer increases, the reflectivity gradually increases at long wavelengths. For example, when the thickness of the gold layer increases from 50nm to 200nm, the reflectivity can be increased by about 30% -40% at a wavelength of 2500nm. However, the thicker the gold layer, the better. Overly thick gold layers can lead to increased costs, increased membrane stress, and absorption peaks in certain frequency bands.

The refractive index and surface flatness of PET substrate also affect the reflection characteristics of PET gold plating film. A PET substrate with a higher refractive index may cause more reflection and refraction of reflected light at the interface between the substrate and the gold layer, thereby altering the overall reflection characteristics. Uneven surface of PET substrate can lead to uneven deposition of gold layer, resulting in fluctuations in reflectivity in different regions. Advanced Institute (Shenzhen) Technology Co., LtdBy strictly controlling the quality of the PET substrate to ensure it has a suitable refractive index and high surface flatness, the reflection characteristics of the PET gold plating film can be optimized.

In summary, the PET gold plating film of Advanced Institute (Shenzhen) Technology Co., Ltd. exhibits complex and diverse reflection characteristics under different wavelengths of light. In the ultraviolet region, the reflectivity is low and slowly increases with wavelength. In the visible region, there are reflectivity valleys and rising ranges due to the plasmon resonance effect. In the near-infrared region, the reflectivity significantly increases with wavelength. The thickness of the gold layer and the characteristics of the PET substrate are important factors affecting its reflection properties. A deep understanding of these reflection characteristics and their influencing factors is of great significance for the application of PET gold plating film in optical, electronic and other fields. For example, in the field of optoelectronic displays, the contrast and color reproduction of the display can be optimized based on its reflection characteristics in the visible light region; In the field of optical sensing, the detection of specific substances or physical quantities is achieved by utilizing their reflection changes at different wavelengths. Future research can further explore how to precisely regulate the reflective properties of PET gold plating films through material structure optimization and process improvement, in order to meet the needs of more high-end applications.
The above data is for reference only, and specific performance may vary due to production processes and product specifications.