Surface Plasmon Spectroscopy with Angle Tuning for Index Drift
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Solution Overview
Problem
Conventional absorption-response near-infrared spectroscopy struggles to accurately separate refractive index changes from changes in the state of a sample, leading to instability in spectroscopic spectra due to shifts in the peak wavelength of the resonance spectrum, which reduces the apparent intensity of the absorption spectrum.
Innovation Solution
A spectroscopic analysis device and method that utilizes a controller to adjust the incidence angle of irradiation light to match the peak wavelengths of the resonance and absorption spectra in different wavelength bands, allowing for accurate refractive index information acquisition and separation of spectral information in visible and near-infrared regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional absorption-response near-infrared spectroscopy is used, then the absorption spectrum of the sample can be detected, but the peak wavelength of the resonance spectrum shifts when the refractive index of the sample changes, causing the apparent intensity of the absorption spectrum to reduce and making it difficult to separate refractive index change information from sample state change information
Solution Approach 1:
The patent divides the spectroscopic spectrum into two distinct wavelength bands: a first wavelength band (visible region) where only the resonance spectrum occurs, and a second wavelength band (near-infrared region) where both the resonance spectrum and absorption spectrum occur. By segmenting the spectral analysis into these separate bands, the patent enables independent measurement of refractive index changes (using only the resonance spectrum in the first band) and sample state changes (using the combined spectra in the second band), thereby resolving the information separation difficulty.
Solution Approach 2:
The patent introduces refractive index information obtained from the first wavelength band as an intermediary element. This refractive index information serves as a mediator that allows the system to compensate for refractive index changes in the second wavelength band, enabling accurate separation of refractive index effects from sample state effects and maintaining measurement precision.
2Ease of operation
If the incidence angle of irradiation light is fixed, then the measurement process is simple, but the peak wavelength of the resonance spectrum shifts with refractive index changes, reducing the apparent intensity of the absorption spectrum
Solution Approach 1:
The patent transitions from a fixed incidence angle configuration to a dynamic adjustment mechanism. The controller dynamically determines and adjusts the incidence angle of the irradiation light based on the refractive index information obtained from the first wavelength band. This dynamic adjustment ensures that the peak wavelength of the resonance spectrum remains matched with the peak wavelength of the absorption spectrum, maintaining stable apparent intensity while adapting to refractive index changes.
Solution Approach 2:
The patent implements a feedback control mechanism where the controller continuously monitors the refractive index information from the first wavelength band and uses this feedback to adjust the incidence angle in the second wavelength band. This feedback loop ensures that any shifts in the resonance spectrum peak wavelength due to refractive index changes are compensated, maintaining optimal measurement conditions and stable apparent intensity.
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 precise analysis of the sample's state by compensating for refractive index changes, enhancing the apparent intensity of the absorption spectrum, and improving measurement sensitivity.
Implementation Method 1
surface plasmon resonance near-infrared spectroscopy (absorption-response near-infrared spectroscopy) to excite and resonate free electrons in a metal with light, superimpose the resonance spectrum of the surface plasmon with the absorption spectrum of the sample
Implementation Method 2
an irradiator configured to irradiate irradiation light on the membrane
Implementation Method 3
a detector configured to detect measurement light including information on a spectroscopic spectrum that includes a resonance spectrum of the surface plasmon and an absorption spectrum of the sample
Data Source
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AI summary
A spectroscopic analysis device (1) according to the present disclosure includes a controller (40) that acquires refractive index information on a sample (S) based on information on a first spectroscopic spectrum in a first wavelength band in which only a resonance spectrum of surface plasmon occurs within a spectroscopic spectrum, determines, based on the acquired refractive index information, an incidence angle of irradiation light (L1) irradiated by an irradiator (10) with respect to a membrane (M) such that the peak wavelength of the resonance spectrum and the peak wavelength of an absorption spectrum of the sample (S) match in a second spectroscopic spectrum in a second wavelength band in which the resonance spectrum and the absorption spectrum occur within the spectroscopic spectrum, and analyzes the state of the sample (S) from information on the second spectroscopic spectrum obtained based on the determined incidence angle.