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Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology Raman Effect And Micro-raman Spectroscopy 拉曼效應與微拉曼光譜儀.

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Presentation on theme: "Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology Raman Effect And Micro-raman Spectroscopy 拉曼效應與微拉曼光譜儀."— Presentation transcript:

1 Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology Raman Effect And Micro-raman Spectroscopy 拉曼效應與微拉曼光譜儀 Student : 王維勤 Student ID : MA2L0205 Advisor : 吳坤憲 1

2 Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology Outline Introduction Raman effect Micro-Raman Spectroscopy 2

3 Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology Why the Oceans Are Blue? 3

4 Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology Introduction In 1928, C.V.Raman found when the light is scattered, the frequency of scattering light will change in the gas and liquid. The change in frequency is determined the material characteristics when it scattering light. 4 C. V. Raman ( )

5 Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology Introduction Incident Light 0 Reflected light 0 Transmitted light 0 elastic scattering Light 0  0 inelastic scattering light 5

6 Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology Scattering light most belong to the elastic scattering, also known as Rayleigh scattering. Very small portion of the scattered light are inelastic scattering, the frequency will change after scattering.  E=h 0 Generate energy exchange, and energy of the incident light are not the same. 6 Introduction 0

7 Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology Inelastic scattering also known as Raman scattering, refers to the frequency changing when the light are scattered. When light enters the sample surface and molecular collisions, the molecular excitation energy to a virtual state, then scattering way to release energy. 7 Raman Effect

8 Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology Raman Effect 8

9 Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology Raman Effect Scattering Light  Scattering Light Frequency = Incident Light Frequency (Rayleigh Scattering) ‚ Scattering Light Frequency > Incident Light Frequency (Anti stokes line) ƒ Scattering Light Frequency = Incident Light Frequency (Stokes line) Stoke line  E=h( 0 -  ) Anti Stokes line  E=h( 0 +  ) 一般偵測拉曼光譜偵測的是散射光子與入射 光子的頻率差,稱之為 Raman shift 。 0 -  0 + 0 Stoke line Rayleigh Scattering Anti Stokes line 9

10 Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology Micro-Raman Spectroscopy Lasersample Spectroscope CCD computer 利用 CCD( 光學多頻道分析儀 ) 的拉曼光譜儀 10

11 Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology Micro-Raman Spectroscopy Sample Incident Light Scattering light Reflected light 11 Sample Incident Light Scattering light Incident Light

12 Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology Micro-Raman Spectroscopy 12 探測器 分光儀 ( 光譜儀 ) 前置單色器

13 Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology 13 Micro-Raman Spectroscopy Laser wavelength : 325nm 、 532nm 、 633nm

14 Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology Micro-Raman measurements 14 Micro -Raman measurements are performed at room temperature under excitation at 532 nm of Nd: YAG laser. 根據橫向光學聲子模型可以得知 (Transverse Optical phonon, TO mode) 非晶鍺 - 鍺鍵結光譜峰值位於 ~270cm -1 結晶鍺 - 鍺鍵結光譜峰值位於 ~ 300cm -1 鍺 - 矽鍵結光譜峰值位於 ~ 400cm -1 非晶矽 - 矽鍵結光譜峰值位於 ~ 486cm -1 結晶矽 - 矽鍵結 ~ 520cm -1 Film thickness ~ 100nm

15 Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology Micro-Raman measurements According to the transverse optical phonon model (TO mode), we can know: The peak position indicates the composition and structure of the sample. Intensity spectrum shows the concentration of an ingredient 15

16 Advanced Nano-technology and Applied Optoelectronics Lab. Southern Taiwan University of Science Technology Thanks for your attention 16


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