Propagation of Light in Anisotropic Optical Media

2006 ◽  
pp. 39-71
Keyword(s):  
Optical Media ◽  
Propagation Of Light

Exact solutions for the propagation of light in nonlinear optical media with nonperiodic modulation

2006 ◽  
Vol 74 (1) ◽  
pp. 132-135 ◽  
Author(s):  
Ruiyu Hao ◽  
Rongcao Yang ◽  
Ping Nie ◽  
Lu Li ◽  
Guosheng Zhou
Keyword(s):  
Exact Solutions ◽  
Nonlinear Optical ◽  
Optical Media ◽  
Propagation Of Light ◽  
Nonlinear Optical Media

Modelling Light Transmission in a Fiber-Optical Reflection System

2004 ◽  
Vol 9 (1) ◽  
pp. 55-63
Author(s):  
V. Kleiza
Keyword(s):  
Optical Sensors ◽  
Light Transmission ◽  
External Cavity ◽  
Linear Displacement ◽  
Fiber System ◽  
Light Emitting ◽  
Optical Media ◽  
Reflected Light ◽  
Fiber Optical ◽  
Fiber Optical Sensors

Light transmission in the reflection fiber system, located in external optical media, has been investigated for application as sensors. The system was simulated by different models, including external cavity parameters such as the distance between light emitting and receiving fibers and mirror positioning distance. The sensitivity to a linear displacement of the sensors was studied as a function of the distance between the tips of the light emitting fiber and the center of the pair reflected light collecting fibers, by positioning a mirror. Physical fundamentals and operating principles of the advanced fiber optical sensors were revealed.

Cataract. Diagnostic errors at referring patients to surgery

2020 ◽  
Author(s):  
V.V. Egorov ◽  
◽  
E.L. Sorokin ◽  
G.P. Smoliakova ◽  
O. V. Kolenko ◽  
...  
Keyword(s):  
Clinical Diagnosis ◽  
Diagnostic Errors ◽  
Ophthalmological Examination ◽  
Slit Lamp ◽  
Critical View ◽  
Optical Media

The textbook examines the most common diagnostic errors of ophthalmologists when making a clinical diagnosis of "cataract". Clinical examples point to a more critical view of the cataract diagnosis. Due to the fact that most of the errors are based on a superficial examination of the eye, clear recommendations are given for conducting a clinical ophthalmological examination of cataracts. At the same time, special attention is paid to the types of examination of the lens with the help of a slit lamp, to the peculiarities of performing various types of ophthalmoscopy with moderate opacity of optical media.

Magnetic Emulsions as Prospective Magneto-Optical Media

2021 ◽  
pp. 1-1
Author(s):  
Constantine Yerin ◽  
Sergey Belykh
Keyword(s):  
Optical Media

scholarly journals The Optical Properties of Leaf Structural Elements and Their Contribution to Photosynthetic Performance and Photoprotection

Plants ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1455
Author(s):  
George Karabourniotis ◽  
Georgios Liakopoulos ◽  
Panagiota Bresta ◽  
Dimosthenis Nikolopoulos
Keyword(s):  
Glandular Trichomes ◽  
Spectral Band ◽  
Co2 Assimilation ◽  
Photosynthetic Performance ◽  
Structural Elements ◽  
Internal Layers ◽  
Water Losses ◽  
Light Gradient ◽  
Propagation Of Light ◽  
Light Capture

Leaves have evolved to effectively harvest light, and, in parallel, to balance photosynthetic CO2 assimilation with water losses. At times, leaves must operate under light limiting conditions while at other instances (temporally distant or even within seconds), the same leaves must modulate light capture to avoid photoinhibition and achieve a uniform internal light gradient. The light-harvesting capacity and the photosynthetic performance of a given leaf are both determined by the organization and the properties of its structural elements, with some of these having evolved as adaptations to stressful environments. In this respect, the present review focuses on the optical roles of particular leaf structural elements (the light capture module) while integrating their involvement in other important functional modules. Superficial leaf tissues (epidermis including cuticle) and structures (epidermal appendages such as trichomes) play a crucial role against light interception. The epidermis, together with the cuticle, behaves as a reflector, as a selective UV filter and, in some cases, each epidermal cell acts as a lens focusing light to the interior. Non glandular trichomes reflect a considerable part of the solar radiation and absorb mainly in the UV spectral band. Mesophyll photosynthetic tissues and biominerals are involved in the efficient propagation of light within the mesophyll. Bundle sheath extensions and sclereids transfer light to internal layers of the mesophyll, particularly important in thick and compact leaves or in leaves with a flutter habit. All of the aforementioned structural elements have been typically optimized during evolution for multiple functions, thus offering adaptive advantages in challenging environments. Hence, each particular leaf design incorporates suitable optical traits advantageously and cost-effectively with the other fundamental functions of the leaf.

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