NV-Diamond Spiral Nanocoils for High-Resolution Magnetic Readout
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Solution Overview
Problem
Existing micro- and nano-fabricated inductors face limitations in integration with standard fabrication processes, particularly in achieving high spatial resolution and performance in electromagnetic signal conversion, due to theoretical and fabrication constraints related to quality factor, frequency bandwidth, and temporal response.
Innovation Solution
The integration of spiral inductors with a nitrogen vacancy (NV) diamond substrate, utilizing electron-beam lithography (EBL) for nanoscale fabrication, includes a dielectric barrier layer and overlayer, enabling high-turn-density nanocoils with controlled dimensions and enhanced magnetic field detection through fluorescence modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If metal-based flat spiral coils are used for on-chip electromagnetic signal conversion, then structural and thermal stability is improved, but manufacturing precision and spatial resolution are limited
Solution Approach 1:
The patent transitions from conventional two-dimensional flat spiral coils to three-dimensional vertically aligned nanohelices. This dimensional change enables submicron spatial resolution through vertical stacking while maintaining the thermal and structural stability of the metal-based construction, effectively resolving the contradiction between manufacturing precision and stability.
Solution Approach 2:
The patent employs composite material structures combining metal-based nanohelices with dielectric materials and integrates them with NV-diamond substrates. This composite approach allows the metal components to provide structural stability while the nanoscale fabrication techniques enable high manufacturing precision, simultaneously achieving both requirements.
2Manufacturing precision
If nano-scale lithography techniques are used to maximize spatial resolution, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the fabrication process into distinct stages: conventional layer deposition for structural components, followed by targeted nano-scale lithography only where high spatial resolution is needed for the nanohelix patterns. This segmentation allows most of the device to be manufactured using simpler processes while applying complex techniques only where necessary, reducing overall device complexity.
Solution Approach 2:
The patent uses dielectric materials as intermediary layers between the NV-diamond substrate and the metal nanohelices, and between different fabrication stages. These intermediary layers facilitate the integration of nano-scale features with conventional fabrication processes, acting as buffers that simplify the overall manufacturing complexity while enabling high precision where needed.
3Ease of manufacture
If conventional microlithography is used for patterning coil structures, then ease of manufacture is improved, but spatial resolution and performance are limited
Solution Approach 1:
The patent overcomes the spatial resolution limits of conventional microlithography by moving from in-plane patterning to vertical stacking in the third dimension. The nanohelices are formed by depositing material layers at nanoscale thicknesses and stacking them vertically, achieving submicron resolution without requiring advanced lateral lithography techniques, thus maintaining ease of manufacture while improving precision.
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 enhances magnetic field detection sensitivity and signal conversion, allowing for highly sensitive magnetic field sensors and electromagnetic-to-optical signal conversion, suitable for environmental and biomedical applications, and spin-based computation.
Implementation Method 1
the nitrogen vacancy diamond emits fluorescence having an intensity that is modulated by the magnetic field generated by the spiral nanocoil
Implementation Method 2
the magnetic field generated by the spiral nanocoil
Data Source
AI summary
Spiral inductors, magnetic field sensors incorporating the spiral inductors, and methods of using the magnetic field sensors are provided. The spiral inductors include an electrically conductive spiral coil and a nitrogen vacancy (NV) diamond substrate. A thin barrier layer of a dielectric material separates the spiral coil from the surface of the NV diamond substrate and an overlayer of dielectric material is disposed over the spiral nanocoil. The integration of the spiral coil with an NV substrate in this manner creates a highly enhanced magnetic transduction and produces a simple, high-performance way to control and read out electromagnetic signals. Because the spiral inductors enable electromagnetic-to-optical signal conversion, they can be used as sensors for environmental or biomedical applications and spin-based computation.