Design and operation of a multi-dimensional coherent spectroscopy system
department or school: Science, Faculty of
department or school: Physics and Astronomy, Department of
data provider: DSpace
degree campus: UBCV
creator: Werner, Maxwell
issued: 2024-08-21T20:57:57Z
issued: 2024
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: The field of two dimensional materials is growing rapidly, with monolayer transition metal dichalcogenides (TMD) showing promise for applications in electronics and optoelectronics. Multidimensional coherent spectroscopy (MDCS) is a nonlinear technique which offers a significant advantage over commonly used linear spectroscopy, allowing for the direct determination of homogeneous linewidths and coherent coupling between states. These capabilities also allow for identification of decoherence mechanisms. Moreover, collinear MDCS allows for hyperspectral imaging which could be leveraged to characterize and improve sample fabrication, a key concern for monolayer systems and heterostructures. Towards this end, we have developed an ultrafast light source which, when combined with a commercial MDCS system, can be utilized to study a variety of 2D semiconductors with optical bandgaps in the visible to near infrared. The light source is a synchronously pumped Optical Parametric Oscillator (OPO), capable of producing optical pulses with approximately 50nm bandwidths and a center wavelength tunable from 650nm to 900nm through adjustment of the cavity length and lithium triborate (LBO) crystal temperature. The design, characterization and operation of this OPO is presented for the benefit of future system users. Additionally, cavity simulations indicate that bandwidth limitations are ultimately imposed by the cavity mirror dispersion. Suggestions are made to overcome these limitations in the future using alternative dispersion compensation methods or single-pass nonlinear broadening. To measure multi-dimensional spectra, we utilized the MONSTR Sense Technologies BIGFOOT Ultrafast Spectrometer. Using monolayer MoSe₂ samples as a benchmark, we worked to verify the operation of the spectrometer. Two prominent artifacts were observed in the measured spectra – a narrow peak along the diagonal and a vertical stripe extending across the excitation energy axis. The source of the narrow…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/88992
note: Design and Operation of a Multi-dimensional CoherentSpectroscopy SystembyMaxwell WernerB.Sc., Bethel University, 2018A THESIS SUBMITTED IN PARTIAL FULFILLMENTOF THE REQUIREMENTS FOR THE DEGREE OFMaster of ScienceinTHE FACULTY OF GRADUATE AND POSTDOCTORALSTUDIES(Physics)The University of British Columbia(Vancouver)August 2024© Maxwell Werner, 2024The following individuals certify that they have read, and recommend to the Fac-ulty of Graduate and Postdoctoral Studies for acceptance, the thesis entitled:Design and Operation of a Multi-dimensional Coherent SpectroscopySystemsubmitted by Maxwell Werner in partial fulfillment of the requirements for thedegree of Master of Science in Physics.Examining Committee:David Jones, Professor, Physics and Astronomy, UBCSupervisorZiliang Ye, Associate Professor, Physics and Astronomy, UBCSupervisory Committee MemberiiAbstractThe field of two dimensional materials is growing rapidly, with monolayer Transi-tion metal dichalcogenides (TMD) showing promise for applications in electronicsand optoelectronics. Multidimensional coherent spectroscopy (MDCS) is a non-linear technique which offers a significant advantage over commonly used linearspectroscopy, allowing for the direct determination of homogeneous linewidths andcoherent coupling between states. These capabilities also allow for identificationof decoherence mechanisms. Moreover, collinear MDCS allows for hyperspectralimaging which could be leveraged to characterize and improve sample fabrication,a key concern for monolayer systems and heterostructures. Towards this end, wehave developed an ultrafast light source which, when combined with a commercialMDCS system, can be utilized to study a variety of 2D semiconductors with opti-cal bandgaps in the visible to near infrared. The light source is a synchronously-pumped Optical Parametric Oscillator (OPO), capable of producing optical pulseswith ≈ 50nm bandwidths and a center wavelength tunable from 650nm to 900nmthrough adjustment of t…
has type: Thesis/Dissertation
date issued: 2024-11
is shown at: 10.14288/1.0445123
language: eng
degree discipline: Physics
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Jones, David John, 1969-
type: Text
identifier URI: http://hdl.handle.net/2429/88992