{"id":{"repo_id":"nus","oai_identifier":"oai:scholarbank.nus.edu.sg:10635/23169"},"canonical_url":"https://search.dev.ndltd.org/etd/nus/oai:scholarbank.nus.edu.sg:10635/23169","repository":{"repo_id":"nus","name":"National University of Singapore","base_url":"https://scholarbank.nus.edu.sg/oai/request"},"display":{"title":"Acoustic mode quantization in nanostructures","abstract":"Brillouin light scattering has been employed to investigate the confined acoustic modes of three different nanostructures, viz. silica and polystyrene nanospheres, hollow carbon microspheres, and GeO2 nanocubes. The confined acoustic modes observed show significantly different features from those of the corresponding bulk. Based on elasticity theory, the eigenfrequencies of these modes have been calculated and they agree well with the experimental data. Furthermore, by fitting the calculated mode frequencies to the experimental ones, the elastic properties of these nanostructures have been determined. In addition, the controversy surrounding selection rules for Raman and Brillouin light scattering from eigenvibrations of nanospheres has been discussed. The Brillouin selection rules for a sphere with a diameter of the order of the excitation light wavelength have been derived by group theory.","abstract_html":"Brillouin light scattering has been employed to investigate the confined acoustic modes of three different nanostructures, viz. silica and polystyrene nanospheres, hollow carbon microspheres, and GeO2 nanocubes. The confined acoustic modes observed show significantly different features from those of the corresponding bulk. Based on elasticity theory, the eigenfrequencies of these modes have been calculated and they agree well with the experimental data. Furthermore, by fitting the calculated mode frequencies to the experimental ones, the elastic properties of these nanostructures have been determined. In addition, the controversy surrounding selection rules for Raman and Brillouin light scattering from eigenvibrations of nanospheres has been discussed. The Brillouin selection rules for a sphere with a diameter of the order of the excitation light wavelength have been derived by group theory.","abstract_has_math":false,"creators":["LI YI"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2007,"date_issued":"2007-09-20","date_published":"2007-09-20","updated_at":"2026-07-24T03:31:00Z","subjects":["Brillouin Light scattering, nanostructure, confined acoustic modes, elastic property, selection rules, group theory"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["LI YI"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.issued","label":"Date","values":["2007-09-20"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://scholarbank.nus.edu.sg/handle/10635/23169"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Brillouin Light scattering, nanostructure, confined acoustic modes, elastic property, selection rules, group theory"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://scholarbank.nus.edu.sg/bitstreams/cbda86f0-015b-4f64-8234-78c7f9a13dcd/download"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Brillouin light scattering has been employed to investigate the confined acoustic modes of three different nanostructures, viz. silica and polystyrene nanospheres, hollow carbon microspheres, and GeO2 nanocubes. The confined acoustic modes observed show significantly different features from those of the corresponding bulk. Based on elasticity theory, the eigenfrequencies of these modes have been calculated and they agree well with the experimental data. Furthermore, by fitting the calculated mode frequencies to the experimental ones, the elastic properties of these nanostructures have been determined. In addition, the controversy surrounding selection rules for Raman and Brillouin light scattering from eigenvibrations of nanospheres has been discussed. The Brillouin selection rules for a sphere with a diameter of the order of the excitation light wavelength have been derived by group theory."]},{"key":"dc:format.checksum.md5","label":"Dc Format Checksum Md5","values":["a0e08254b9373d6deccacb2212f7aed8","33534ec382b6b73395b6bc84cb73c91c"]},{"key":"dc:title","label":"Title","values":["Acoustic mode quantization in nanostructures"]}]}],"canonical_facts":{"dc:creator":["LI YI"],"dc:date.issued":["2007-09-20"],"dc:description.abstract":["Brillouin light scattering has been employed to investigate the confined acoustic modes of three different nanostructures, viz. silica and polystyrene nanospheres, hollow carbon microspheres, and GeO2 nanocubes. The confined acoustic modes observed show significantly different features from those of the corresponding bulk. Based on elasticity theory, the eigenfrequencies of these modes have been calculated and they agree well with the experimental data. Furthermore, by fitting the calculated mode frequencies to the experimental ones, the elastic properties of these nanostructures have been determined. In addition, the controversy surrounding selection rules for Raman and Brillouin light scattering from eigenvibrations of nanospheres has been discussed. The Brillouin selection rules for a sphere with a diameter of the order of the excitation light wavelength have been derived by group theory."],"dc:format.checksum.md5":["a0e08254b9373d6deccacb2212f7aed8","33534ec382b6b73395b6bc84cb73c91c"],"dc:identifier.uri":["https://scholarbank.nus.edu.sg/bitstreams/cbda86f0-015b-4f64-8234-78c7f9a13dcd/download"],"dc:relation.isreferencedby":["https://scholarbank.nus.edu.sg/handle/10635/23169"],"dc:subject":["Brillouin Light scattering, nanostructure, confined acoustic modes, elastic property, selection rules, group theory"],"dc:title":["Acoustic mode quantization in nanostructures"],"dc:type":["Thesis"]},"updated_at":"2026-07-24T03:31:00Z"}