南邮材料化学MC2016-Chapter7-1
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such as GeO2, TiO2, Al2O3, ZrO2, B2O3, P2O5
,
SiF4.
15
Advantages and disadvantages of quartz optical fiber
Excellent light transmittance, broad band
width, low loss, be used as far distance
6
7.2 Optical fiber
An optical fiber (or optical fibre) is a flexible, transparent fiber made of high quality extruded glass (silica) or plastic, slightly thicker than a human hair.
High refraction, transparent, spinnable, adhesive. Doping GeO2, TiO2, Al2O3, ZrO2 to increase the refraction index.
Need to decrease the content of absorbable group. C-H
alternative for far distance transmission.
17
Advantages and disadvantages of plastics optical fiber
low cost, good plasticity, light,
convenient to construct, no
4
What is photonic material?
1)
Fra Baidu bibliotek
Physical chemical properties of material can be changed by photons
2)
Property of photos can be changed by
material
3)
External energy or change in internal
structure can cause photons releasing
5
Application of photonic materials
Photonic materials and devices play critically
important roles in telecommunications, information processing and storage, chemical sensors, solar cells, light emitting diodes, magneto-optic memories, video systems, color imaging and other important applications. They include a wide variety of materials and material technologies, such as wide band-gap semiconductors, materials for magnetic data storage, diamond materials for extra-bright display screens, micro-materials for next-generation displays, semiconductor laser materials and so on.
the homogenity and low loss of signal. Glass contains K+ and Na+, which is amorphous and with many defects, Si-OH can absorb infrared light. Additionally, K+ and Na+ are sensitive to water, which increase the content of Si-OH, make more defect and unfavorable scattering.
so it only can be used for short-distance signal transmission.
C-D bonds can reduce the absorption of
infrared and visible light.
Polymer contains C-F bonds is also a good
Chapter 7 Photonic Materials
7.1 Introduction
Chapter4 New-style metallic materials
7.2 Optical fiber 7.3 Optical crystal
7.7 Luminescent materials
1
key terms
gastroscopy
Low-cost, short distance comm, sensor
Spectra of various optic fibers
13
(1) Quartz optical fiber
Purity is high, 99.99999%(7N) which can ensure
9
Fibers that support many propagation paths or transport modes are called multi-mode fibers (MMF), while those that only support a single mode are called single-mode fibers (SMF). Multi-mode fibers generally have a wider core diameter, and are used for shortdistance communication links and for applications where high power must be transmitted. Single-mode fibers are used for most communication links longer than 1,000 meters (3,300 ft).
photon, photonics, generation, emission, transmission, modulation, signal processing, switching, amplification, display, sensing, optical fiber, total internal reflection, core, cladding, high refraction, transparent, to be spinning, adhesive, multi-mode fibers, single-mode fibers, quartz, liquid core, doping. photonic crystal, photonic band gap, dielectric stacks, refractive index, lithography highperformance reflector, photonic crystal waveguide
10
7.2.2 Classification of optical fiber
According to material:
Quartz optical fiber
Multi-component glass optical fiber
Plastics optical fiber Liquid core optical fiber Doping optical fiber
2
photonic crystal optical fiber, luminescence, irradiated, emission, intensity, quantum efficiency, persistence, fluorescence, persistence time, phosphorescence, cathodoluminescence, photoluminescence, electroluminescence, chemiluminescence, X-ray luminescence, photometry Flux, CIE color, coordinate system, color temperature, basic absorption, excition absorption, photoconductive, photoluminescence phenomenon
高锟1966年提出了传 输介质新概念---原材 料的提纯制造出适合 于长距离通信使用的 低损耗光纤
2009 Nobel Prize
7
7.2.1 Structure of optical fiber
Optical fibers typically include a transparent core surrounded by a transparent cladding material with a lower refraction index. Light is kept in the core by total internal reflection. This allows the fiber to act as a waveguide.
11
According
to refractive index
Step-Index Fiber Graded-Index Fiber
According
to transmission mode
single-mode fibers (SMF)
multi-mode fibers
12
Small loss, long distance comm
14
Doping of quartz
Doping of quartz is to increase or decrease the refractivity to be used as core or cladding.
Doping elements are always exist as oxides,
transmission, generally 100-200 km
High cost, strict quality control, crisp, easily to break off, difficult to repair.
16
(2) Plastics optical fiber
Many C-H bonds can absorb infrared light,
3
7.1 Introduction
The science of photonics includes the generation, emission, transmission, modulation, signal processing, switching, amplification, and detection/sensing of light.
electromagnetic compatibility
High loss, low heat resistance, short working life
18
(3) liquid core optical fiber
纤芯
包层
保护套
8
Low refraction, transparent, formability, wear and heat resistance, adhesive. Doping B2O3, SiF4, P2O5 to decrease the refraction index.
Question:
,
SiF4.
15
Advantages and disadvantages of quartz optical fiber
Excellent light transmittance, broad band
width, low loss, be used as far distance
6
7.2 Optical fiber
An optical fiber (or optical fibre) is a flexible, transparent fiber made of high quality extruded glass (silica) or plastic, slightly thicker than a human hair.
High refraction, transparent, spinnable, adhesive. Doping GeO2, TiO2, Al2O3, ZrO2 to increase the refraction index.
Need to decrease the content of absorbable group. C-H
alternative for far distance transmission.
17
Advantages and disadvantages of plastics optical fiber
low cost, good plasticity, light,
convenient to construct, no
4
What is photonic material?
1)
Fra Baidu bibliotek
Physical chemical properties of material can be changed by photons
2)
Property of photos can be changed by
material
3)
External energy or change in internal
structure can cause photons releasing
5
Application of photonic materials
Photonic materials and devices play critically
important roles in telecommunications, information processing and storage, chemical sensors, solar cells, light emitting diodes, magneto-optic memories, video systems, color imaging and other important applications. They include a wide variety of materials and material technologies, such as wide band-gap semiconductors, materials for magnetic data storage, diamond materials for extra-bright display screens, micro-materials for next-generation displays, semiconductor laser materials and so on.
the homogenity and low loss of signal. Glass contains K+ and Na+, which is amorphous and with many defects, Si-OH can absorb infrared light. Additionally, K+ and Na+ are sensitive to water, which increase the content of Si-OH, make more defect and unfavorable scattering.
so it only can be used for short-distance signal transmission.
C-D bonds can reduce the absorption of
infrared and visible light.
Polymer contains C-F bonds is also a good
Chapter 7 Photonic Materials
7.1 Introduction
Chapter4 New-style metallic materials
7.2 Optical fiber 7.3 Optical crystal
7.7 Luminescent materials
1
key terms
gastroscopy
Low-cost, short distance comm, sensor
Spectra of various optic fibers
13
(1) Quartz optical fiber
Purity is high, 99.99999%(7N) which can ensure
9
Fibers that support many propagation paths or transport modes are called multi-mode fibers (MMF), while those that only support a single mode are called single-mode fibers (SMF). Multi-mode fibers generally have a wider core diameter, and are used for shortdistance communication links and for applications where high power must be transmitted. Single-mode fibers are used for most communication links longer than 1,000 meters (3,300 ft).
photon, photonics, generation, emission, transmission, modulation, signal processing, switching, amplification, display, sensing, optical fiber, total internal reflection, core, cladding, high refraction, transparent, to be spinning, adhesive, multi-mode fibers, single-mode fibers, quartz, liquid core, doping. photonic crystal, photonic band gap, dielectric stacks, refractive index, lithography highperformance reflector, photonic crystal waveguide
10
7.2.2 Classification of optical fiber
According to material:
Quartz optical fiber
Multi-component glass optical fiber
Plastics optical fiber Liquid core optical fiber Doping optical fiber
2
photonic crystal optical fiber, luminescence, irradiated, emission, intensity, quantum efficiency, persistence, fluorescence, persistence time, phosphorescence, cathodoluminescence, photoluminescence, electroluminescence, chemiluminescence, X-ray luminescence, photometry Flux, CIE color, coordinate system, color temperature, basic absorption, excition absorption, photoconductive, photoluminescence phenomenon
高锟1966年提出了传 输介质新概念---原材 料的提纯制造出适合 于长距离通信使用的 低损耗光纤
2009 Nobel Prize
7
7.2.1 Structure of optical fiber
Optical fibers typically include a transparent core surrounded by a transparent cladding material with a lower refraction index. Light is kept in the core by total internal reflection. This allows the fiber to act as a waveguide.
11
According
to refractive index
Step-Index Fiber Graded-Index Fiber
According
to transmission mode
single-mode fibers (SMF)
multi-mode fibers
12
Small loss, long distance comm
14
Doping of quartz
Doping of quartz is to increase or decrease the refractivity to be used as core or cladding.
Doping elements are always exist as oxides,
transmission, generally 100-200 km
High cost, strict quality control, crisp, easily to break off, difficult to repair.
16
(2) Plastics optical fiber
Many C-H bonds can absorb infrared light,
3
7.1 Introduction
The science of photonics includes the generation, emission, transmission, modulation, signal processing, switching, amplification, and detection/sensing of light.
electromagnetic compatibility
High loss, low heat resistance, short working life
18
(3) liquid core optical fiber
纤芯
包层
保护套
8
Low refraction, transparent, formability, wear and heat resistance, adhesive. Doping B2O3, SiF4, P2O5 to decrease the refraction index.
Question: