DMD Two-Color Photolithography for High-Speed Nanopatterning
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Solution Overview
Problem
Conventional photolithography technologies face limitations in resolution due to the optical diffraction limit, requiring expensive and complex EUV lithography, and two-color super-resolution photolithography is slow due to point scanning for 3D nanopatterning.
Innovation Solution
A high-speed nanopatterning method and apparatus using a digital micromirror device (DMD) with controlled micromirrors to reflect photochemical reaction initiation and inhibition lights of different wavelengths, forming overlapping patterns to reduce the effective reaction area through diffraction, enabling high-speed nanopatterning without masks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If point scanning is performed for 3D nanopatterning in conventional two-color super-resolution photolithography, then high resolution is achieved, but nanopatterning speed becomes slow
Solution Approach 1:
The patent divides the illumination area into multiple discrete regions using an array of microlenses, where each microlens illuminates a specific region. This allows parallel processing of multiple regions simultaneously, eliminating the need for sequential point scanning and dramatically increasing nanopatterning speed while maintaining super-resolution capability
Solution Approach 2:
The patent replaces the mechanical scanning system with a static array of microlenses that provides parallel illumination across multiple regions. This substitution of mechanical scanning with a fixed optical array enables high-speed nanopatterning by eliminating moving parts and sequential operation
2Manufacturing precision
If EUV lithography is used to achieve super-resolution nanopatterning, then resolution of several nm is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent uses visible light (405 nm) instead of EUV light, achieving comparable resolution through a different mechanism. By copying the functional outcome of EUV lithography using accessible visible light wavelengths combined with two-color photolithography and microlens arrays, the system achieves similar resolution without requiring complex EUV optical components
Solution Approach 2:
The patent changes the fundamental parameters of the lithography system by using visible light wavelengths (405 nm) instead of EUV wavelengths, and by introducing a second wavelength for photoinhibition. This parameter change allows achieving super-resolution through chemical mechanisms rather than relying solely on short wavelength optical physics, thereby avoiding EUV equipment complexity
3Ease of operation
If visible light photolithography is used for mass production, then ease of application is improved, but resolution is limited by optical diffraction
Solution Approach 1:
The patent applies local quality by using an array of microlenses where each microlens creates a localized super-resolution spot. The two-color photolithography mechanism also applies local quality by suppressing photochemical reactions in specific regions through spatially selective photoinhibition, thereby achieving high resolution in illuminated areas while maintaining ease of mass production application
Solution Approach 2:
The patent uses composite photoreactive materials that respond to two different wavelengths of light - one for initiating photochemical reactions and another for inhibiting them. This composite material approach enables super-resolution nanopatterning using visible light, combining the ease of visible light photolithography with enhanced resolution capability
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
Achieves resolution comparable to EUV lithography at lower costs, allowing for high-speed, maskless formation of various 2D patterns and nanostructures, overcoming the speed limitations of conventional two-color photolithography.
Implementation Method 1
a first light source for outputting photochemical reaction initiation light of a first wavelength causing a photochemical reaction to occur in an illuminated area of a photoresist
Implementation Method 2
a second light source for outputting inhibition light of a second wavelength suppressing the photochemical reaction in the illuminated area of the photoresist
Implementation Method 3
a digital micromirror device including a plurality of micromirrors controlled at a first angle and a second angle and for reflecting a portion of the photochemical reaction initiation light output from the first light source or the inhibition light output from the second light source toward the photoresist
Implementation Method 4
The effective area may be formed by partially overlapping the first pattern and the second pattern due to a light-spreading phenomenon caused by a diffraction of the photochemical reaction initiation light and the inhibition light
Data Source
AI summary
The present subject matter provides a high-speed nanopatterning method and apparatus of two-color super-resolution photolithography. According to the present subject matter, a high-speed nanopatterning apparatus of two-color super-resolution photolithography comprises: a first light source for outputting photochemical reaction initiation light of a first wavelength causing a photochemical reaction to occur in an illuminated area of a photoresist; a first lens for enlarging a beam size of the photochemical reaction initiation light; a second light source for outputting inhibition light of a second wavelength suppressing the photochemical reaction in the illuminated area of the photoresist; a second lens for enlarging a beam size of the inhibition light; and a digital micromirror device including a plurality of micromirrors controlled at a first angle and a second angle and for reflecting a portion of the photochemical reaction initiation light output from the first light source or the inhibition light output from the second light source toward the photoresist through the plurality of micromirrors.