Visualization of Subatomic Movements in Nanostructures
| Autor: | Jun-Yu Ou, Kevin F. MacDonald, Tongjun Liu, Eric Plum, Nikolay I. Zheludev |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Photons Cantilever business.industry Mechanical Engineering Resolution (electron density) Nanocantilever Optical Imaging Physics::Optics Bioengineering General Chemistry Condensed Matter Physics Noise floor Displacement (vector) Photonic metamaterial Nanostructures Interferometry Microscopy Electron Motion Optics General Materials Science business Nanomechanics |
| Zdroj: | Nano letters. 21(18) |
| ISSN: | 1530-6992 |
| Popis: | Electron microscopy, scanning probe, and optical super-resolution imaging techniques with nanometric resolution are now routinely available but cannot capture the characteristically fast (MHz-GHz frequency) movements of micro-/nano-objects. Meanwhile, optical interferometric techniques can detect high-frequency picometric displacements but only with diffraction-limited lateral resolution. Here, we introduce a motion visualization technique, based on the spectrally resolved detection of secondary electron emission from moving objects, that combines picometric displacement sensitivity with the nanometric spatial (positional/imaging) resolution of electron microscopy. The sensitivity of the technique is quantitatively validated against the thermodynamically defined amplitude of a nanocantilever's Brownian motion. It is further demonstrated in visualizing externally driven modes of cantilever, nanomechanical photonic metamaterial, and MEMS device structures. With a noise floor reaching ∼1 pm/Hz1/2, it can provide for the study of oscillatory movements with subatomic amplitudes, presenting new opportunities for the interrogation of motion in functional structures across the materials, bio- and nanosciences. |
| Databáze: | OpenAIRE |
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