Electron-Beam Raman Imaging With Localized Emitter Registration
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Solution Overview
Problem
Current Raman spectroscopy and electron microscopy techniques face challenges in achieving high spatial resolution and accurate alignment, limiting their ability to simultaneously image the ultrastructure and molecular constituents of complex biological samples.
Innovation Solution
The integration of stimulated Raman spectroscopy with electron microscopy using plasmonic nanoparticles and an electron beam to achieve sub-diffraction-limited spatial resolution, where the electron beam acts as a localized light source for Raman imaging, enabling simultaneous electron microscopy and Raman spectral mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional Raman spectroscopy is used, then molecular identification capability is improved, but spatial resolution deteriorates due to diffraction limit
Solution Approach 1:
The patent introduces a localized electromagnetic emitter (nanoparticle) as an intermediary between the optical pump radiation and the sample. This nanoparticle is disposed in proximity to the sample and has an electromagnetic resonance at the Raman-shifted wavelength, enabling it to mediate the energy transfer and generate localized electromagnetic fields that overcome the diffraction limit while maintaining molecular identification capability through Raman spectroscopy.
Solution Approach 2:
The patent applies local quality by using a localized electromagnetic emitter (nanoparticle) that concentrates electromagnetic energy at a specific location near the sample. This creates highly localized electromagnetic fields at the nanoparticle position, enabling sub-diffraction-limited spatial resolution while maintaining the molecular identification capability through stimulated Raman scattering at that specific location.
2Length of moving object
If electron microscopy is used, then spatial resolution is improved, but molecular identification capability deteriorates due to grayscale imaging limitation
Solution Approach 1:
The patent merges electron microscopy and Raman spectroscopy into a single integrated system. The electron beam serves dual purposes: as an excitation source for the localized electromagnetic emitter (enabling Raman signal generation) and as an imaging probe in the electron microscope. This combination allows simultaneous acquisition of high-resolution structural information from electron microscopy and molecular identification information from Raman spectroscopy, resolving the contradiction between spatial resolution and molecular identification capability.
3Adaptability or versatility
If sequential correlated imaging is used, then both electron microscopy and optical spectroscopy data are obtained, but alignment accuracy deteriorates due to different sample preparation procedures
Solution Approach 1:
The patent merges electron microscopy and Raman spectroscopy into a single integrated system where both measurements are performed simultaneously on the same sample in the same coordinate system. The electron beam serves as both the excitation source for Raman signal generation and the imaging probe, eliminating the need for sequential imaging and subsequent alignment of separate images. This resolves the alignment accuracy problem while maintaining the versatility of obtaining both structural and molecular information.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for high-resolution molecular and chemical mapping with improved signal-to-noise ratio, enabling direct probing of local molecular chirality and fine details of chiral structures, and can be integrated with existing electron microscopes, providing unprecedented spatial resolution and correlation between light and electron beam imaging.
Implementation Method 1
providing optical pump radiation to the sample at a predetermined wavelength, where the sample defines a Raman-shifted wavelength relative to the predetermined wavelength
Implementation Method 2
disposing a localized electromagnetic emitter in proximity to the sample, where the localized electromagnetic emitter has an electromagnetic resonance at the Raman-shifted wavelength
Implementation Method 3
providing a non-electromagnetic excitation to the localized electromagnetic emitter configured to excite an electromagnetic mode of the localized electromagnetic emitter at the Raman-shifted wavelength
Data Source
AI summary
Improved stimulated Raman spectroscopy is provided by replacing the Stokes (or anti-Stokes) optical source with a localized electromagnetic emitter that is excited with a non-electromagnetic excitation. Such a localized emitter can be an efficient Stokes (or anti-Stokes) source for stimulated Raman spectroscopy, and can also provide deep sub-wavelength spatial resolution. In a preferred embodiment, an electron beam from an electron microscope is used to excite the localized emitter. This provides combined Raman imaging and electron microscopy that has the two imaging modalities inherently registered with each other.