相关概念视频
01:16Focusing of Light in the Eye
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Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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01:37Super-resolution Fluorescence Microscopy
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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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02:39Emission Spectra
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When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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02:16Light Acquisition
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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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02:26Photoelectric Effect
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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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01:05Total Internal Reflection Fluorescence Microscopy
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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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概括
红宝石显示了强烈的反向和吸收,导致光脉冲显著前进. 这种红宝石的快速光效应在光学设备中具有潜在的应用.
科学领域:
- 光学和光子学 在光学和光子学.
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 反向和吸收是光物相互作用中罕见的现象.
- 了解快速和慢光效应对于光学技术至关重要.
研究的目的:
- 为了研究473 nm的红宝石中反向和吸收的现象.
- 测量和理论解释在红宝石中观察到的光脉冲的时间推进.
主要方法:
- 在红宝石中反向和吸收的实验观测.
- 用红宝石测量调制激光束的群速.
- 理论建模使用连贯的人口振荡和时间依赖的吸收.
主要成果:
- 红宝石在473nm时表现出强烈的反向和吸收.
- 观察到脉冲峰值的时间推进超过100微秒.
- 计算出一个大,负组指数为 - - 1.7 ± 0.1) × 10^6,与快光效应一致.
结论:
- 在红宝石中观察到的脉冲推进可以通过连贯的人口振荡和时间依赖的吸收来解释.
- 这项研究增强了对过渡金属合晶体中快速和缓慢光现象的理解.
