Efficient Integration Between an Integrated Optics Raman Spectrometer and a Cmos Based Photo Detector

9538 Words Nov 29th, 2014 39 Pages
Group 2.6
Efficient integration between an integrated optics Raman spectrometer and a CMOS based photo detector

Group 2.6
Dirk Reith, Ewoud van Lent, Zeno Geuke, Martijn Blom, Gijsbert van den Engh
Coach:
Fehmi Civitci
Hugo Hoekstra
Senior Coach:
Gert-Jan Koster
OTNW-Oktober-2011

Table of Contents

Part 1: The research page 3
Introduction page 4
Chapter 1: Raman Spectroscopy page 5
Chapter 2: Integrated Raman Spectroscopy page 9
Chapter 3: The Experiment page 12
References page 19

Part 2: The research group page 20 Introduction page 21 Chapter 1: IOMS in general page 22 Chapter 2: The Chairman interview page 23 Chapter 3: The Master Student interview page 25
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Using Raman spectroscopy one is able to detect the compositions of certain molecules, like a fingerprint, having the (infrared) frequency corresponding to the vibrational and the rotational modes

Raman spectroscopy is based on the Raman scattering, which is also called inelastic scattering, this is the scattering of monochromatic light, which usually origins from a laser with a range near the infrared or ultraviolet, more about this later.

Raman spectroscopy is much like infrared spectroscopy, as they both rely on the shift in energy states in vibrations and rotations, however infrared spectroscopy is based on the absorption of the light whereas Raman spectroscopy is based on the scattering. The fact that they are both based on another principle makes them a good combination to gain information about a certain vibration or rotation, as in some occasions infrared spectroscopy can’t give you enough information about the to be analyzed material, e.g. when there is a certain symmetry, where Raman spectroscopy can, and vice versa. Therefore it is recommended to use both spectroscopic techniques to gain more useful and specific information about certain modes in a system.

Figure 1.1 Energy level diagram showing the states involved in Raman signal. [2]
As mentioned before, Raman spectroscopy is based on Raman scattering, which is the inelastic scattering of a photon, for example certain in molecules in human tissue. When a photon interacts with the material,

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