Reflective Electron Beam Lithography Lenslet Structure
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Solution Overview
Problem
Traditional reflective electron beam lithography devices face issues with electron charging due to insulating materials between metal electrodes, leading to reduced functionality and lifespan.
Innovation Solution
The method involves creating a substrate with conductive layers separated by insulating pillars, where one area is completely free of insulating material to prevent electron charging, and the other area has minimal insulation to support conductive layers, using a multi-layered structure with specific etching processes to form apertures and pillars, ensuring that conductive layers are suspended and protected from electron bombardment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating materials are used between metal electrodes in lenslet structures, then electrical insulation is provided, but electron charging occurs that deteriorates lenslet functionality
Solution Approach 1:
The patent removes insulating materials from the electron beam path in the lenslet structure, extracting the harmful element (insulator) that causes electron charging while maintaining electrical insulation through alternative means such as suspended conductive layers designed to minimize charging effects
Solution Approach 2:
The patent applies different structural qualities to different regions: conductive layers are suspended without insulating material in the electron beam interaction region to prevent charging, while insulating materials are retained in non-beam regions where electrical isolation is needed, creating localized structural optimization
2Duration of action of stationary object
If conventional lenslet structures with insulators are used, then manufacturing is simplified, but device lifetime is reduced due to charging deterioration
Solution Approach 1:
The lenslet structure is segmented into distinct functional regions: suspended conductive layers for electron interaction, insulating support structures for electrical isolation, and apertured regions for beam transmission. This segmentation allows each component to be optimized for its specific function while working together to extend device lifetime
Solution Approach 2:
The patent employs composite structures combining conductive and insulating materials in specific configurations - suspended conductive layers without insulators in the beam path, combined with insulating support structures in non-beam areas, creating a composite lenslet structure that addresses both charging and insulation requirements
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 effectively prevents electron charging, extending the stability and lifetime of the lenslet structure by minimizing electron interaction with insulating materials, thereby enhancing the performance and durability of reflective electron beam lithography devices.
Implementation Method 1
a lenslet of a mirror made by micro-electro-mechanical systems (MEMS) is used to reflect electrons back to a wafer for patterning
Data Source
AI summary
A device for reflective electron-beam lithography and methods of producing the same are described. The device includes a substrate, a plurality of conductive layers formed on the substrate, which are parallel to each other and separated by insulating pillar structures, and a plurality of apertures in each conductive layer. Apertures in each conductive layer are vertically aligned with the apertures in other conductive layers and a periphery of each aperture includes conductive layers that are suspended.