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Gang Chen. Hsu, Wei-Chun Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Massachusetts Institute of Technology. Department of Mechanical Engineering 2013-03-28T18:11:56Z 2013-03-28T18:11:56Z 2012 2012 http://hdl.handle.net/1721.1/78182 829815404 Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012. Cataloged from PDF version of thesis. Includes bibliographical references (p. 85-88). 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. by Wei-Chun Hsu. S.M. 88 p. eng Massachusetts Institute of Technology 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. http://dspace.mit.edu/handle/1721.1/7582 Mechanical Engineering. Direct and quantitative broadband absorptance micro/nano spectroscopy using FTIR and bilayer cantilever probes Direct and quantitative broadband absorptance micro/nano spectroscopy using Fourier Transform Infrared Spectroscopy and bilayer cantilever probes Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="77a283f7-543a-4d41-b322-70a33f76efef"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Direct and quantitative broadband absorptance micro/nano spectroscopy using FTIR and bilayer cantilever probes</Title> <Subtitle>Direct and quantitative broadband absorptance micro/nano spectroscopy using Fourier Transform Infrared Spectroscopy and bilayer cantilever probes</Subtitle> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2012</PublicationDate> <Authors> <Author> <DisplayName>Hsu, Wei-Chun</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Mechanical Engineering.</Keyword> <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.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>