Sequential Probing of Solid-State Spin Systems
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Solution Overview
Problem
Current methods for probing nitrogen-vacancy centers in diamond for magnetic sensing are limited by high laser power requirements, which prevent parallel measurements across multiple sites due to risk of damage and high costs, and also suffer from insufficient sensitivity with existing photodetectors.
Innovation Solution
A method involving sequential scanning of a focused light beam across multiple probing positions, with each position illuminated within a scanning duration shorter than three times the spin-lattice or spin-spin relaxation time of the solid-state spin systems, allowing for rapid sequential optical readout while reducing laser power demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser power is increased to enable parallel measurements at multiple sites, then measurement throughput is improved, but risk of sample damage and optical element damage increases
Solution Approach 1:
The patent segments the measurement process by sequentially scanning a focused light beam across multiple probing positions instead of illuminating all sites simultaneously. This temporal segmentation allows each site to receive full laser power during its brief measurement window while avoiding cumulative damage that would occur with continuous multi-site illumination.
Solution Approach 2:
The patent implements periodic action by rapidly scanning the light beam through a sequence of probing positions within a duration shorter than the spin relaxation time. This periodic illumination pattern enables each site to be measured with high laser power for a brief interval, then allowed to recover before the next measurement cycle.
2Productivity
If laser power is increased to enable parallel measurements at multiple sites, then measurement throughput is improved, but cost of optical equipment increases
Solution Approach 1:
The patent segments the optical illumination approach from simultaneous multi-site excitation to sequential single-site excitation. This enables the use of a single focused laser beam with standard optical components rather than requiring multiple high-power lasers or complex beam-splitting optics for parallel illumination.
Solution Approach 2:
The patent introduces dynamic scanning of the light beam position using optical deflectors, transforming a static multi-site illumination setup into a dynamic sequential scanning system. This dynamic approach maintains high measurement throughput while using simpler, lower-cost optical components.
3Measurement precision
If scanning duration is extended to cover multiple probing positions, then spatial resolution is improved, but signal-to-noise ratio deteriorates due to relaxation effects
Solution Approach 1:
The patent optimizes the scanning duration parameter to be shorter than the spin-lattice and spin-spin relaxation times. This parameter optimization ensures that the spin system remains in a non-equilibrium state throughout the scanning process, preserving signal coherence and minimizing relaxation-induced signal loss while still enabling spatially resolved measurements across multiple positions.
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 enables high-throughput probing of samples with improved signal-to-noise ratio, avoiding excessive laser power and preventing damage, while allowing for spatially resolved detection even with point-like photodetectors.
Implementation Method 1
At each probing position, solid-state spin systems at the respective probing position are illuminated with the focused light beam
Implementation Method 2
A scanning duration within which the focused light beam is scanned across the plurality of probing positions is shorter than three times a spin-lattice relaxation time of the solid-state spin systems
Implementation Method 3
shorter than three times a spin-spin relaxation time of the solid-state spin systems
Data Source
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AI summary
Disclosed herein is a method for probing optically addressable solid-state spin systems at a plurality of probing positions and a device for probing optically addressable solid-state spin systems. The method comprises sequentially scanning a focused light beam across said plurality of probing positions and, at each probing position, illuminating solid-state spin systems at the respective probing position with said focused light beam. A scanning duration within which said focused light beam is scanned across said plurality of probing positions is shorter than three times a spin-lattice relaxation time of said solid-state spin systems and/or shorter than three times a spin-spin relaxation time of said solid-state spin systems.