Graphene Cladding Optical Fiber for Deep-UV Transmission
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Solution Overview
Problem
Current optical fibers are limited in their ability to operate effectively in the deep-UV spectrum, particularly for applications like protein detection, medical procedures, and electronic device communications, due to the index of refraction mismatch between graphene and silica, making it challenging to fabricate optical fibers with a graphene layer as cladding for deep-UV applications.
Innovation Solution
A deep-UV optical circuit and fiber design that incorporates a graphene cylinder as a cladding layer with a core formed of a gas or vacuum, where the graphene cylinder has an inner diameter varying between 157 nm and 300 nm, allowing for the transmission of light wavelengths below 250 nm through total internal reflection, leveraging graphene's refractive index less than 1 in this spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a graphene layer is applied as cladding for deep-UV optical fiber applications, then the optical properties for deep-UV transmission are improved, but the index of refraction mismatch between graphene and silica makes fabrication challenging
Solution Approach 1:
The patent changes the core material parameter from solid silica to gas or vacuum, which has a lower index of refraction (1.000-1.002) that better matches graphene's index in the deep-UV spectrum. This parameter change resolves the index mismatch problem that made previous fabrication attempts difficult.
Solution Approach 2:
The patent creates a composite optical fiber structure combining graphene cladding with a gas-filled or vacuum core, rather than using traditional silica-core designs. This composite approach allows each material to contribute its optimal properties: graphene for deep-UV transmission and gas/vacuum for index of refraction matching.
2Ease of manufacture
If traditional silica optical fibers are used for deep-UV applications, then the fiber structure is simple and easy to manufacture, but the index of refraction mismatch limits deep-UV transmission efficiency
Solution Approach 1:
The patent changes the core material parameter from solid silica to gas or vacuum, which has a lower index of refraction (1.000-1.002) that better matches graphene's index in the deep-UV spectrum. This parameter change resolves the index mismatch problem that made previous fabrication attempts difficult.
3Ease of manufacture
If optical interconnects use metal conductors, then the current technology is mature and easy to implement, but performance is limited as transistors scale to smaller sizes
Solution Approach 1:
The patent replaces metal electrical conductors with optical waveguides that use light propagation for data transmission. This substitution eliminates the fundamental limitations of metal interconnects (resistance, capacitance, signal integrity) and enables higher bandwidth and faster communication speeds necessary for scaled transistor architectures.
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
Enables efficient transmission of deep-UV light signals, facilitating miniaturization and improved performance in optical interconnects within electronic devices, enhancing communication speeds and reducing metal interconnect limitations as transistors scale.
Implementation Method 1
transmits light wavelengths (λ) below 250 nm as graphene has an index of refraction less than 1 for light wavelengths (λ) below 250 nm
Data Source
AI summary
A deep-UV optical circuit includes a laser emitting light wavelengths (λ) below 250 nm. The circuit also includes a graphene optical cable formed of an optic core formed of a gas or vacuum having an index of refraction ranging between 1.000 and 1.002 and a cladding layer formed of a graphene cylinder made of a contiguous lattice of covalently-bonded carbon atoms surrounding the optic core. The circuit also includes an optical detector circuit configured to detect the light. The graphene optical cable optically couples the laser to the optical detector circuit, where the optical cable transmits light wavelengths (λ) below 250 nm as graphene has an index of refraction less than 1 for light wavelengths (λ) below 250 nm.