Direct and quantitative broadband absorptance micro/nano spectroscopy using FTIR and bilayer cantilever probes
Name
829815404-MIT.pdf
Description
Full printable version
Size
10.77 MB
Format
Adobe PDF
Checksum (MD5)
18820212754f79459767a5d8818ee34a
Author(s)
Hsu, Wei-Chun
Advisor(s)
Gang Chen.
Alternative Title
Direct and quantitative broadband absorptance micro/nano spectroscopy using Fourier Transform Infrared Spectroscopy and bilayer cantilever probes
Date Issued
2012
Publisher
Massachusetts Institute of Technology
Abstract
Optical properties of micro/nano materials are important for many applications in biology, optoelectronics, and energy. In this thesis, a method is described to directly measure the quantitative absorptance spectra of micro/nano-sized structures using Fourier Transform Spectroscopy (FTS). The measurement technique combines optomechanical cantilever probes with a modulated broadband light source from an interferometer for spectroscopic measurements of objects. Previous studies have demonstrated the use of bilayer (or multi-layer) cantilevers as highly sensitive heat flux probes with the capability of resolving power as small as ~4 pW. Fourier Transform Spectroscopy is a well-established method to measure broadband spectra with significant advantages over conventional dispersive spectrometers such as a higher power throughput and large signal-to-noise ratio for a given measurement time. By integrating a bilayer cantilever probe with a Michelson interferometer, the new platform is capable of measuring broadband absorptance spectra from 3prm to 18pm directly and quantitatively with an enhanced sensitivity that enables the characterization of micro- and nanometer-sized samples, which cannot be achieved by using conventional spectroscopic techniques. Besides, a paralleled project of a bi-armed cantilever decouples the sample arm and the probe arm to further enhance the signal-to-noise ratio.
Description
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 85-88).
Subjects
Mechanical Engineering.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
M.I.T. theses are protected by
copyright. They may be viewed from this source for any purpose, but
reproduction or distribution in any format is prohibited without written
permission. See provided URL for inquiries about permission.
copyright. They may be viewed from this source for any purpose, but
reproduction or distribution in any format is prohibited without written
permission. See provided URL for inquiries about permission.
Persistent DSpace Link
