Nanodiamond NV Sensor Filtering Pump Light for Microwave-Free Flux Sensing
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Solution Overview
Problem
Current NV center-based sensor systems require microwave frequency, limiting biocompatibility and increasing production complexity due to the need for precise crystal alignment and costly circuits.
Innovation Solution
A microwave-free NV center-based sensor system utilizing multiple NV centers in nanodiamonds with different crystal orientations, where the sensor element itself acts as an optical filter, separating pump and fluorescence radiation without the need for additional optical filters, and using a compensation coil to stabilize magnetic flux density for enhanced sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If microwave frequency is used in NV center-based sensor systems, then magnetic field measurement capability is achieved, but biocompatibility is limited and production complexity increases
Solution Approach 1:
The patent extracts and eliminates the microwave control requirement from the NV center-based sensor system. By using optical pumping with a laser source instead of microwave frequency control, the system removes the complex microwave circuitry while maintaining magnetic field measurement capability through optical detection of NV center spin states.
Solution Approach 2:
The patent substitutes the microwave electromagnetic control system with an optical control system. Instead of using microwave frequency to manipulate NV center spins, the system uses laser excitation and optical detection methods, replacing complex microwave electronics with simpler optical components that improve biocompatibility and reduce production complexity.
2Measurement precision
If precise crystal alignment is required, then measurement accuracy is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent makes the sensor system universal by using nanodiamonds with random crystal orientations that all function equivalently for magnetic field sensing. Instead of requiring each diamond crystal to be precisely aligned, the system accepts nanodiamonds in any orientation, and the optical detection method adapts to measure the projection of spin states along the excitation polarization direction, making manufacturing much simpler.
Solution Approach 2:
The patent changes the measurement parameter from requiring absolute spin state population differences (which need precise alignment) to measuring polarization-dependent fluorescence intensity variations. By detecting changes in fluorescence intensity as a function of polarization angle, the system can extract magnetic field information without requiring the crystal axes to be precisely aligned with the measurement apparatus.
3Measurement precision
If additional optical filters are used to separate pump and fluorescence radiation, then radiation separation is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes the nanodiamond sensor element self-serving by incorporating intrinsic optical filtering properties directly into the material. The nanodiamonds exhibit wavelength-selective absorption and emission characteristics where they strongly absorb the pump laser wavelength and emit fluorescence at a different wavelength, effectively filtering the pump radiation from the fluorescence signal without requiring external optical filters.
Solution Approach 2:
The patent utilizes the composite optical properties of nanodiamonds, which combine the diamond crystal lattice with nitrogen-vacancy defect centers. This composite structure creates distinct absorption and emission spectra that naturally separate the pump and fluorescence radiation wavelengths, eliminating the need for additional optical filtering components.
4Measurement precision
If microwave control circuits are used, then spin state manipulation is achieved, but cost and production complexity increase
Solution Approach 1:
The patent substitutes microwave electromagnetic control with optical control using laser excitation. The laser light manipulates NV center spin states through optical pumping and resonant excitation schemes, replacing complex microwave circuitry with simpler optical components that are easier to manufacture and integrate, thereby reducing production cost while maintaining spin state manipulation 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
This approach enhances biocompatibility, reduces production complexity, and improves sensitivity by eliminating the need for microwave control and precise alignment, while maintaining effective magnetic field measurement capabilities.
Implementation Method 1
a first pump radiation source (PL1) for pump radiation (LB), in particular in the form of an LED or a laser, and a first radiation receiver (PD1). The pump radiation (LB) causes the paramagnetic center (NV1) or the plurality (NVC) of paramagnetic centers (NV1) to emit fluorescence radiation (FL)
Implementation Method 2
The sensor element itself acts as an optical filter, separating pump and fluorescence radiation without the need for additional optical filters
Implementation Method 3
using a compensation coil to stabilize magnetic flux density for enhanced sensitivity
Data Source
Figure 1
Figure 2
Figure 3~3b
AI summary
The invention relates to a sensor system (NVMS) with a quantum dot, which can comprise a paramagnetic centre (NV1). The sensor system comprises a control and analysis device (AWV), which has a first pumped radiation source (PL1), a radiation receiver (PD1), and which irradiates the quantum dot with pumped radiation (LB) by means of the first pumped radiation source (PL1). The quantum dot emits fluorescence radiation (FL) as it is irradiated with the pumped radiation (LB), the fluorescence radiation being dependent on a physical parameter. Depending on the fluorescence radiation (FL), the control and analysis device (AWV) generates a first output signal (out) having a signal component that represents a measurement value. The measurement value is dependent on the value of the physical parameter. By means of one or more compensation coils (LC), the control and analysis device (AWV) controls the sensitivity of the quantum dot for the physical parameter in a compensatory manner, such that the receiver output signal (SO) of the radiation receiver (PD1) then no longer has any substantial component of the transmission signal (S5).