threshold wavelength

简明释义

临界波长

英英释义

例句

1.Understanding the threshold wavelength (阈值波长) helps in improving solar cell efficiency.

理解阈值波长(阈值波长) 有助于提高太阳能电池的效率。

2.In photodetectors, the threshold wavelength (阈值波长) determines the minimum energy required for electron excitation.

在光电探测器中，阈值波长(阈值波长) 决定了电子激发所需的最低能量。

3.Researchers found that the threshold wavelength (阈值波长) for this material is around 600 nm.

研究人员发现该材料的阈值波长(阈值波长) 大约为600纳米。

4.The device operates efficiently when the light source is above the threshold wavelength (阈值波长) of 500 nm.

当光源的波长超过阈值波长(阈值波长) 500 纳米时，设备运行效率较高。

5.The threshold wavelength (阈值波长) is crucial for designing optical filters.

设计光学滤波器时，阈值波长(阈值波长) 是至关重要的。

作文

The concept of threshold wavelength is pivotal in the field of physics and engineering, particularly when discussing the behavior of light and its interaction with various materials. In essence, the threshold wavelength refers to the specific wavelength at which a material begins to absorb photons significantly, leading to a variety of physical phenomena such as electronic transitions in atoms and molecules. Understanding this concept is crucial for applications ranging from photonics to semiconductor technology.To illustrate, let’s consider the example of a semiconductor material. When light is shone on a semiconductor, it can induce electron-hole pairs, which are essential for the functioning of devices like solar cells and light-emitting diodes (LEDs). The threshold wavelength in this context would be the maximum wavelength of light that can effectively excite electrons from the valence band to the conduction band. If the wavelength of the incoming light exceeds this threshold, no significant excitation occurs, and thus, the material remains inactive.Moreover, the threshold wavelength is not a fixed value; it varies depending on the material's properties and the temperature conditions. For instance, certain materials may exhibit a shorter threshold wavelength at lower temperatures due to reduced thermal vibrations, which allows for more efficient photon absorption. Conversely, at higher temperatures, increased atomic movement can lead to a longer threshold wavelength, affecting the material's electronic behavior.In addition to semiconductors, the threshold wavelength is also significant in the study of lasers. Lasers operate by stimulating a medium to emit light coherently. The threshold wavelength determines the minimum energy required for the laser to function effectively. If the wavelength of the light emitted is too long, the laser may not reach the necessary population inversion needed for amplification, which is critical for producing a coherent beam.Furthermore, the threshold wavelength plays a crucial role in optical communication systems. In fiber optics, for example, the choice of wavelength for transmitting signals is influenced by the threshold wavelength of the materials used in the fiber. Selecting wavelengths that are below the threshold wavelength ensures that the signal experiences minimal loss and distortion as it travels through the fiber.In conclusion, the threshold wavelength is a fundamental concept that underpins many technologies we rely on today. Its implications stretch across various fields, including electronics, telecommunications, and materials science. By understanding the threshold wavelength, researchers and engineers can design more efficient systems and innovate new technologies. As we continue to explore the properties of materials and their interactions with light, the significance of the threshold wavelength will undoubtedly remain a central topic of discussion and research in the scientific community.

“阈值波长”这一概念在物理和工程领域中至关重要，特别是在讨论光的行为及其与各种材料的相互作用时。简单来说，阈值波长指的是材料开始显著吸收光子并导致一系列物理现象（如原子和分子的电子跃迁）的特定波长。理解这一概念对于从光子学到半导体技术等应用至关重要。例如，考虑半导体材料的例子。当光照射到半导体上时，它可以诱导电子-空穴对，这对于太阳能电池和发光二极管（LED）等设备的功能至关重要。在这种情况下，阈值波长将是能够有效激发电子从价带跃迁到导带的最大光波长。如果入射光的波长超过这个阈值，则不会发生显著的激发，因此材料保持不活跃。此外，阈值波长不是一个固定值；它取决于材料的特性和温度条件。例如，某些材料在低温下可能会表现出较短的阈值波长，因为热振动减少，从而允许更有效的光子吸收。相反，在高温下，原子运动增加可能导致较长的阈值波长，从而影响材料的电子行为。除了半导体，阈值波长在激光研究中也具有重要意义。激光通过刺激介质以相干方式发出光。阈值波长决定了激光有效运行所需的最小能量。如果发出的光的波长过长，激光可能无法达到放大所需的人口反转，这是产生相干光束的关键。此外，阈值波长在光通信系统中也发挥着关键作用。在光纤中，例如，传输信号的波长选择受到光纤材料的阈值波长的影响。选择低于阈值波长的波长可以确保信号在光纤中传播时经历最小的损失和失真。总之，阈值波长是支撑我们今天依赖的许多技术的基本概念。它的影响遍及多个领域，包括电子学、电信和材料科学。通过理解阈值波长，研究人员和工程师可以设计更高效的系统并创新新技术。随着我们继续探索材料的性质及其与光的相互作用，阈值波长的重要性无疑将继续成为科学界讨论和研究的核心主题。