Lithographic Substrate Near-Field Exposure via Patterned Layer
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Solution Overview
Problem
Current lithographic methods face challenges in accurately spacing or contacting near-field generating masks with resist-coated substrates, leading to difficulties in achieving precise pattern application and potential damage to the resist.
Innovation Solution
A lithographic method where a further layer with a pattern is applied on top of the resist layer, creating spaces that allow near-field radiation to expose the resist, eliminating the need for precise gap control between the mask and resist, and enabling near-field radiation generation without direct contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a near-field generating mask is used to expose resist, then near-field radiation can be generated to reduce critical dimension, but the mask requires accurate spacing or contact with the resist which is difficult to achieve in practice
Solution Approach 1:
The patent merges the mask and substrate by depositing the patterned chromium layer directly onto the resist-coated substrate. This eliminates the spacing problem between mask and resist while maintaining near-field radiation generation capability, as the patterned layer itself acts as the near-field source in direct contact with the resist
Solution Approach 2:
The patterned chromium layer serves as an intermediary structure that generates near-field radiation to expose the resist. By making this intermediary layer part of the substrate assembly through direct deposition, the patent eliminates the need for separate mask positioning while maintaining the near-field exposure mechanism
2Manufacturing precision
If the mask is brought into contact with the resist, then accurate pattern application may be achieved, but the mask may damage the resist and it is difficult to ensure all areas are actually in contact
Solution Approach 1:
The patterned chromium layer performs multiple functions simultaneously: it serves as the pattern definition layer, the near-field radiation source, and the structural element in contact with resist. This self-service approach eliminates the need for a separate mask that could damage the resist, as the patterned layer is deposited as part of the substrate preparation process
3Manufacturing precision
If independent near-field masks are used, then near-field radiation can be generated, but the device complexity increases and precise gap control is required
Solution Approach 1:
The patent combines the near-field radiation generating function with the substrate structure itself by depositing the patterned chromium layer directly on the substrate. This eliminates independent masks and spacing mechanisms, reducing device complexity while maintaining the ability to generate near-field radiation for critical dimension reduction
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 method reduces the critical dimension of pattern features by generating near-field radiation, allowing for smaller feature sizes without the need for accurate gap control or contact, thus improving the precision and efficiency of pattern application.
Implementation Method 1
exposing the layer of resist to radiation having a wavelength greater than the distance between features of the pattern defining the space, such that near-field radiation is generated which propagates into and exposes an area of the resist
Data Source
AI summary
A lithographic method is disclosed that includes, on a substrate provided with a layer of a resist and a further layer of a material provided on the layer of resist, providing a pattern in the further layer, the pattern defining a space via which an area of the layer of resist may be exposed to radiation, a distance between features of the pattern defining the space, and exposing the layer of resist to radiation having a wavelength greater than the distance between features of the pattern defining the space, such that near-field radiation is generated which propagates into and exposes an area of the resist.