{"id":{"repo_id":"nus","oai_identifier":"oai:scholarbank.nus.edu.sg:10635/233969"},"canonical_url":"https://search.dev.ndltd.org/etd/nus/oai:scholarbank.nus.edu.sg:10635/233969","repository":{"repo_id":"nus","name":"National University of Singapore","base_url":"https://scholarbank.nus.edu.sg/oai/request"},"display":{"title":"PULSED THz GENERATION BASED ON PHOTOCONDUCTIVE ANTENNA FOR THz TIME-DOMAIN SPECTROSCOPY","abstract":"Terahertz (THz) wave is defined as the region of the electromagnetic spectrum with frequencies ranging from 100 GHz to 10 THz. The THz technology has many potential applications. However, it was called the “THz gap” due to the lack of efficient generation of THz waves. Therefore, the development of efficient THz sources plays an important role to close this gap. In this thesis, we investigated the THz pulse generation from a photoconductive antenna (PCA) THz emitter using a 1550 nm femtosecond (fs) laser. The PCA is fabricated based on the InGaAs and InAlAs multilayer structure. The THz signal is measured using the time-domain spectroscopy system. Both the photocurrent and current change are the key determinants of THz amplitude. At least a two-fold increase in the resistance is required for THz emission. In addition, the integration of PCA with a spintronic emitter is proposed for broadband THz emission.","abstract_html":"Terahertz (THz) wave is defined as the region of the electromagnetic spectrum with frequencies ranging from 100 GHz to 10 THz. The THz technology has many potential applications. However, it was called the “THz gap” due to the lack of efficient generation of THz waves. Therefore, the development of efficient THz sources plays an important role to close this gap. In this thesis, we investigated the THz pulse generation from a photoconductive antenna (PCA) THz emitter using a 1550 nm femtosecond (fs) laser. The PCA is fabricated based on the InGaAs and InAlAs multilayer structure. The THz signal is measured using the time-domain spectroscopy system. Both the photocurrent and current change are the key determinants of THz amplitude. At least a two-fold increase in the resistance is required for THz emission. In addition, the integration of PCA with a spintronic emitter is proposed for broadband THz emission.","abstract_has_math":false,"creators":["CUI MINGFANG"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-07-25","date_published":"2022-07-25","updated_at":"2026-07-24T03:30:47Z","subjects":["THz emission, photoconductive antenna (PCA), InGaAs/InAlAs, 1550 nm femtosecond laser, time-domain spectroscopy, spintronic THz emitter"],"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":["CUI MINGFANG"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.issued","label":"Date","values":["2022-07-25"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://scholarbank.nus.edu.sg/handle/10635/233969"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["THz emission, photoconductive antenna (PCA), InGaAs/InAlAs, 1550 nm femtosecond laser, time-domain spectroscopy, spintronic THz emitter"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://scholarbank.nus.edu.sg/bitstreams/41b01464-da60-4e80-a567-d82bccda0586/download"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Terahertz (THz) wave is defined as the region of the electromagnetic spectrum with frequencies ranging from 100 GHz to 10 THz. The THz technology has many potential applications. However, it was called the “THz gap” due to the lack of efficient generation of THz waves. Therefore, the development of efficient THz sources plays an important role to close this gap. In this thesis, we investigated the THz pulse generation from a photoconductive antenna (PCA) THz emitter using a 1550 nm femtosecond (fs) laser. The PCA is fabricated based on the InGaAs and InAlAs multilayer structure. The THz signal is measured using the time-domain spectroscopy system. Both the photocurrent and current change are the key determinants of THz amplitude. At least a two-fold increase in the resistance is required for THz emission. In addition, the integration of PCA with a spintronic emitter is proposed for broadband THz emission."]},{"key":"dc:format.checksum.md5","label":"Dc Format Checksum Md5","values":["f30ecb3d1ea56594c63f066087f4dff4","0d729b815156a8db99ae6b80b270449c"]},{"key":"dc:title","label":"Title","values":["PULSED THz GENERATION BASED ON PHOTOCONDUCTIVE ANTENNA FOR THz TIME-DOMAIN SPECTROSCOPY"]}]}],"canonical_facts":{"dc:creator":["CUI MINGFANG"],"dc:date.issued":["2022-07-25"],"dc:description.abstract":["Terahertz (THz) wave is defined as the region of the electromagnetic spectrum with frequencies ranging from 100 GHz to 10 THz. The THz technology has many potential applications. However, it was called the “THz gap” due to the lack of efficient generation of THz waves. Therefore, the development of efficient THz sources plays an important role to close this gap. In this thesis, we investigated the THz pulse generation from a photoconductive antenna (PCA) THz emitter using a 1550 nm femtosecond (fs) laser. The PCA is fabricated based on the InGaAs and InAlAs multilayer structure. The THz signal is measured using the time-domain spectroscopy system. Both the photocurrent and current change are the key determinants of THz amplitude. At least a two-fold increase in the resistance is required for THz emission. In addition, the integration of PCA with a spintronic emitter is proposed for broadband THz emission."],"dc:format.checksum.md5":["f30ecb3d1ea56594c63f066087f4dff4","0d729b815156a8db99ae6b80b270449c"],"dc:identifier.uri":["https://scholarbank.nus.edu.sg/bitstreams/41b01464-da60-4e80-a567-d82bccda0586/download"],"dc:relation.isreferencedby":["https://scholarbank.nus.edu.sg/handle/10635/233969"],"dc:subject":["THz emission, photoconductive antenna (PCA), InGaAs/InAlAs, 1550 nm femtosecond laser, time-domain spectroscopy, spintronic THz emitter"],"dc:title":["PULSED THz GENERATION BASED ON PHOTOCONDUCTIVE ANTENNA FOR THz TIME-DOMAIN SPECTROSCOPY"],"dc:type":["Thesis"]},"updated_at":"2026-07-24T03:30:47Z"}