| 摘要: | 電漿子近乎無繞射極限的特性使得光可被侷限於奈米尺度的空間中，其純量特性如波長、強度、相位等已能被輕易地操控。然而其向量特性，特別是在奈米尺度下的偏振態操控、超手徵特性之超穎介面、及增強其與手徵分子間的交互作用仍是一大挑戰。被科學家們視為邁向全面操控光子與分子間交互作用的最後一哩路。恰如法拉第一百多年前對光的評註: “Polarised light is the most subtle and delicate investigator of molecular condition.”在計畫的第二年，我們成功發展出全新的光譜-色度座標轉換法，藉一具有深度學習的智能程序，優化照射光源，使原電漿子雙聚體的散射光，因其與掌性分子附著導致之光譜飄移得以轉換並放大為色度空間之座標位移，藉此實現分子手徵特性之判斷。克服了傳統精度不足、須高濃度巨量分子，非一次性檢驗等缺乏信賴度的缺點。在本計畫中，我們將延續此一結果，進一步研究如何產生單一超掌性電磁場及可分離掌性分子之光學力。最終，我們希望能結合電漿子分子與光波導結構實現鏡像異構物的手徵特性檢測及分離。研究工作包含:電漿子寡聚體製作、廣義多粒子米氏散射模擬、光譜-色度座標轉換、光流道技術等。目前理論模擬與實驗均有初步成果。包括: 單一超掌性電磁場的產生、基於色差的手徵特性辨識、基於離子交換光流道輸送奈米粒子、及電漿子雙聚體製程等。接下來的工作需將以上個別離散的部分整合，積體化於一光波導上，達成能同時辨識手徵特性並分離鏡像異構物之終極目標。 上述目標若能達成，將對科學與產業做出貢獻，特別是生物標記、藥/毒物鑑定、食安衛生及環境控制等應用。 ;Sculpting light at nanoscale signifies a substantial step towards comprehensive manipulation of the interaction between photons and molecules. Since plasmon is nearly diffraction unlimited, light can be confined within nano-scale, making the manipulation of its scalar properties such as wavelength, intensity, and phase achievable with little effort. However, being capable of manipulating the vectorial properties at one's desire, for instance, the polarization at nanoscale, superchirality with metasurface, and their enhanced interaction with chiral molecules are still challenging. This has been widely considered as the last mile towards comprehensively control the interactions between photons and molecules, just like the famous remark made by Michael Faraday more than a hundred years ago: “Polarised light is the most subtle and delicate investigator of molecular condition.”During Year 2 of this project, we successfully developed a brand new method where a deep learning based intelligent process enables one to optimize the illuminant. As a result, the originally indistinguishable spectrum shift of the scattered light as a consequence of the interaction between plasmonic dimer and chiral molecules can be amplified and converted into sensorable chromatic shift on CIE 1931 chromaticity diagram. This result allows us to conduct experiment on chirality discrimination where spectrometer with ultra-high resolution, analyte with high concentration, and multiple measurements for differential are no more needed.Following the results obtained in Year 2, in this project, we plan to study homo-superchirality and the associated discriminatory optical force at nanoscale, aiming at integrating chirality recognition and enantiomer separation functionalities altogether on a common waveguide. The proposed tasks include: the fabrication of plasmonic dimer, trimer, or oligomers; generalized multiparticle Mie (GMM) simulation; spectrum-chromaticity conversion, and the fabrication of waveguide based opto-fluidics. So far, preliminary results for homo-superchirality generation, chromatic difference based chirality identification, propelling of nanoparticles using ion-exchange based opto-fluidics, and fabrication of plasmonic dimer have been achieved. We will then integrate the separating parts altogether on a common optical waveguide to perform chirality recognition and enantiomer separation simultaneously. If the abovementioned targets are successfully achieved, the results will certainly benefit to the scientific society and industry, in particular for the field of bio-labeling, drug/toxicant identification, food safety, and environment monitoring |
