4篇
您的检索式：作者名="EUAN MCLEOD"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Dark mode plasmonic optical microcavity biochemical sensor显示文摘Whispering gallery mode(WGM) microtoroid optical resonators have been effectively used to sense low concentrations of biomolecules down to the single molecule limit. Optical WGM biochemical sensors such as the microtoroid operate by tracking changes in resonant frequency as particles enter the evanescent near field of the resonator.Previously, gold nanoparticles have been coupled to WGM resonators to increase the magnitude of resonance shifts via plasmonic enhancement of the electric field. However, this approach results in increased scattering from the WGM, which degrades its quality(Q) factor, making it less sensitive to extremely small frequency shifts caused by small molecules or protein conformational changes. Here, we show using simulation that precisely positioned trimer gold nanostructures generate dark modes that suppress radiation loss and can achieve high (> 10~6) Q with an electric-field intensity enhancement of 4300, which far exceeds that of a single rod(~2500 times). Through an overall evaluation of a combined enhancement factor, which includes the Q factor of the system, the sensitivity of the trimer system was improved 105× versus 84× for a single rod. Further simulations demonstrate that unlike a single rod system, the trimer is robust to orientation changes and has increased capture area. We also conduct stability tests to show that small positioning errors do not greatly impact the result. | CHENG LI LEI CHEN EUAN MCLEOD JUDITH SU | 2019 | Photonics Research2019，7，8： | 3 |
| 2 | Simulating robust far-field coupling to traveling waves in large three-dimensional nanostructured high-Q microresonators显示文摘Ultra-high quality(Q) whispering gallery mode(WGM) microtoroid optical resonators have demonstrated highly sensitive biomolecular detection down to the single molecule limit;however, the lack of a robust coupling method has prevented their widespread adoption outside the laboratory. We demonstrate through simulation that a phased array of nanorods can enable free-space coupling of light both into and out of a microtoroid while maintaining a high Q. To simulate large nanostructured WGM resonators, we developed a new approach known as FloWBEM,which is an efficient and compact 3D wedge model with custom boundary conditions that accurately simulate the resonant Fano interference between the traveling WGM waves and a nanorod array. Depending on the excitation conditions, we find loaded Q factors of the driven system as high as 2.1 × 10~7 and signal-to-background ratios as high as 3.86%, greater than the noise levels of many commercial detectors. These results can drive future experimental implementation. | LEI CHEN CHENG LI YU-MIN LIU JUDITH SU EUAN MCLEOD | 2019 | Photonics Research2019，7，9： | 1 |
| 3 | High- speed varifoeal imaging with a tunable acoustic gradient index of refraction lens显示文摘 | Alexandre Mermillod-Blondin Euan McLeod Craig B Arnold | 2008 | Optics Letters2008，33，18： | 1 |
| 4 | Assembly of multicomp on ent structures from hundreds of micron-scale building blocks using optical tweezers显示文摘The fabrication of three-dimensional(3D)microscale structures is critical for many applications,including strong and lightweight material development,medical device fabrication,microrobotics,and photonic applications.While 3D microfabrication has seen progress over the past decades,complex multicomponent integration with small or hierarchical feature sizes is still a challenge.In this study,an optical positioning and linking(OPAL)platform based on optical tweezers is used to precisely fabricate 3D microstructures from two types of micron-scale building blocks linked by biochemical interactions.A computer-controlled interface with rapid on-the-fly automated recalibration routines main tains accuracy eve n after placi ng many buildi ng blocks.OPAL achieves a 60-nm positional accuracy by optimizing the molecular functionalization and laser power.A two-component structure consisting of 4481-pm building blocks is assembled,representing the largest number of building blocks used to date in 3D optical tweezer microassembly.Although optical tweezers have previously been used for microfabrication,those results were generally restricted to single-material structures composed of a relatively small number of larger-sized building blocks,with little discussion of critical process parameters.It is anticipated that OPAL will enable the assembly,augmentation,and repair of microstructures composed of specialty micro/nanomaterial building blocks to be used in new photonic,microfluidic,and biomedical devices. | Jeffrey E.Melzer Euan McLeod | 2021 | Microsystems & Nanoengineering2021，7，3： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员