題 目🍬:Helical magnetic field-induced magnetoplasmonic chiroptical modulator
報告人:Jaebeom Lee 教授
Chungnam National University(忠南大學)
時 間🚶♀️➡️:2019年8月20日(星期二)10:00
地 點😘:三號沐鸣樓4080室
主持人🐅:張琳萍 副教授
報告人簡介:
Jaebeom Lee教授近年來多次在國際知名期刊發表多篇文章✦🧜🏽,如JACS,Nature material, ACS Applied Bio Materials👨🏻🦯,Electrochimica Acta,ACS Sensors,ACS Applied Materials and Interface,Analytical chemistry,Biosensors and Bioelectronics🟩,Chemical Communication☝🏼,Journal of Biomedical Materials Research Part A等;目前已經申請獲批的專利多達21項🌕🙇🏻♂️;曾多次獲得國內外獎項,2017年榮獲信息通信技術與規劃部頒發的“卓越研究獎”; 2014年獲得納米韓國頒發的“40項年度發明”;2011年獲得PNU頒發的“優秀研究員”獎;2009年與2011年都曾獲得PNU Nanosci. and Nanoeng.頒發的“最佳研究院獎”; 2007年獲得韓國研究基金會新教師獎、韓國 - 美國納米論壇青年科學家獎; 2006年獲得密歇根大學LG Micron Ind / Aca研究獎學金; 2005年獲得密歇根大學計劃科學與工程教育學者(SEESP)獎; 2004年密歇根大學新生研究卓越獎; 2002年獲得羅伯特戈登大學研究生教育獎學金; 1999年獲得羅伯特戈登大學研究生獎學金獎; 2001年,2000年獲得SPIE學生羅伯特戈登大學旅遊補助金獎;1991年,1997年獲得忠南國立大學優秀成就獎學金。
報告內容簡介🕧:
Helical assembly of plasmonic nanomaterials exhibit intense optical activity and have been conducted under the structural assistance of templates which are natural helical materials. Its structural stiffness becomes obstacles to endow tunable and switchable ability. Herein, the helical magnetic field (hB) have been introduced instead of templates. Particularly, magnetoplasmonic (MagPlas) Ag@Fe3O4 core-shell nanoparticles (NPs) were used to guide plasmonic Ag NPs onto helical magnetic flux. The chirality of the assembled helical structures and tailored circular dichroism were successfully tuned, and even handedness has been switched by hB in millisecond level, which is at least 2250-fold faster than other templates-assisted methods. The peak position of circular dichroism is also reconfigurable by controlling the thickness of the magnetic shell and magnetic flux density, owing to the change of the inter-particle or inter-chain distance. hB-induced chirality modulation will open a new strategy that can control the polarization state of light at the nexus of plasmonics, magnetism, colloidal science, liquid crystals, and chirality so that it can be a significant breakthrough for chiral assembly of MagPlas nanomaterials to progress into further practical applications.
(等離子體納米材料的螺旋組裝表現出強烈的光學活性,並在天然螺旋材料模板的結構輔助下進行。本報告主要介紹利用磁等離子體(MagPlas) Ag@Fe3O4核殼納米粒子(NPs)引導等離子體銀納米粒子進入螺旋磁場👇。成功地調整了組合螺旋結構的手性和定製的圓二色性,比其他模板輔助方法至少快2250倍。hb誘導的手性調製將在等離子體🧁、磁學、膠體學、液晶、手性等方面為控製光的偏振態開辟一條新的途徑✊🏽,為磁拉體納米材料的手性組裝進一步的實際應用提供重要的突破。)