{"465551":{"#nid":"465551","#data":{"type":"event","title":"MS Thesis Defense by Sean Rodrigues","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003EMSE MS Thesis Defense \u2013 Sean Rodrigues\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003E\u003Cem\u003EDate\/Time\u003C\/em\u003E\u003C\/strong\u003E: Tuesday, November 10th, 2-4 p.m.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003E\u003Cem\u003ELocation\u003C\/em\u003E:\u003C\/strong\u003E MRDC Conference Room 4404, Building # 135\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003E\u003Cem\u003ECommittee\u003C\/em\u003E:\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDr. Wenshan Cai (advisor)(MSE)\u003Cbr \/\u003E Dr. Mohan Srinivasarao (MSE)\u003Cbr \/\u003E Dr. Vladimir Tsukruk (MSE)\u003C\/p\u003E\u003Cp\u003E\u003Cem\u003ETitle\u003C\/em\u003E: \u201cEnhancing chiroptical signals from metamaterials via nonlinear excitation.\u201d\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003Cem\u003EAbstract\u003C\/em\u003E:\u003C\/p\u003E\u003Cp\u003EAs natural chiral materials demonstrate limited circularly dichroic contrasts, enhancement of these polarization dependent signals has long been the focus of chiral metamaterial research. By manipulating the geometric chirality of resonant plasmonic nanostructures, we are capable of enhancing light confinement to amplify chiral modified, nonlinear signals from quantum emitters. The metamaterial demonstrates a linear transmission contrast of 0.5 between left and right circular polarizations and a 20\u00d7 contrast between second harmonic responses from the two incident polarizations. Nonlinear and linear response images probed with circularly polarized lights show strongly defined contrast. As a second set of experimentation, the chiral center of the metamaterial is opened, providing direct access to place emitters to occupy the most light-confining and chirally sensitive regions. The resulting two-photon emission profiles from circularly polarized excitation displays mirrored symmetry for the two enantiomer structures. The efficiency of the nonlinear signal directly correlates to the chiral resonance of the linear regime. The nonlinear emission signal is enhanced by 40\u00d7 that of the emitters not embedded in the metamaterial and displays a 3\u00d7 contrast for the opposite circular polarization. Such manipulations of nonlinear signals with metamaterials open pathways for diverse applications where chiral selective signals are monitored, processed, and analyzed.\u003C\/p\u003E\u003Cp\u003E \u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Enhancing chiroptical signals from metamaterials via nonlinear excitation"}],"uid":"27707","created_gmt":"2015-11-03 09:07:36","changed_gmt":"2016-10-08 02:14:39","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2015-11-10T18:00:00-05:00","event_time_end":"2015-11-10T20:00:00-05:00","event_time_end_last":"2015-11-10T20:00:00-05:00","gmt_time_start":"2015-11-10 23:00:00","gmt_time_end":"2015-11-11 01:00:00","gmt_time_end_last":"2015-11-11 01:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"111531","name":"ms defense"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}