Multilayer Minus Filter for Fluorescence Microscopy
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Solution Overview
Problem
Conventional minus filters fail to efficiently separate operating and stimulating lights from fluorescence microscopy, requiring filters with narrow wavelength bandwidths and high selectivity to manage multiple wavelengths for observing dynamic cell behavior and interactions.
Innovation Solution
A multilayer minus filter design featuring a repetition layer with a specific ratio of high and low refractive index layers, where the sum of their average optical thicknesses equals the reflection wavelength, allowing for a narrow reflection bandwidth and selective light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical multilayer filters are used to separate excitation light and fluorescence, then wavelength separation is achieved, but the filter cannot efficiently separate operating light and stimulating light from fluorescence
Solution Approach 1:
The filter is divided into multiple repetition layers, each responsible for reflecting specific wavelength bands. This segmentation allows independent optimization of each layer's optical thickness and refractive index ratio to achieve precise separation of multiple wavelengths (excitation, operating, and stimulating lights) without interfering with each other.
Solution Approach 2:
The invention introduces a new design dimension by using the ratio H/L of optical thicknesses as a control parameter. By adjusting this ratio within specific ranges (0.5<H/L<2.0 for first repetition layer, 0.3<H/L<1.5 for second repetition layer), the filter achieves selective reflection of different wavelength bands, enabling simultaneous separation of multiple wavelengths.
2Measurement precision
If the wavelength bandwidth of lights to be stopped is made narrow, then selectivity is improved, but the reflection bandwidth becomes insufficient for practical applications
Solution Approach 1:
The invention optimizes the optical thickness ratio H/L as a key parameter to control reflection bandwidth. By setting H/L within specific ranges (0.5<H/L<2.0 for the first repetition layer targeting 488nm and 543nm lights, and 0.3<H/L<1.5 for the second repetition layer targeting 633nm light), the filter achieves both narrow selectivity and sufficient reflection bandwidth for practical fluorescence microscopy applications.
3Adaptability or versatility
If multiple repetition layers with different H/L ratios are used, then multiple wavelength separations are achieved, but the filter structure becomes more complex
Solution Approach 1:
The filter structure is segmented into multiple repetition layers, with each layer dedicated to reflecting specific wavelength bands. The first repetition layer (with H/L ratio between 0.5 and 2.0) handles 488nm and 543nm lights, while the second repetition layer (with H/L ratio between 0.3 and 1.5) handles 633nm light. This modular segmentation achieves multi-wavelength separation through standardized repeating units.
Solution Approach 2:
Each repetition layer serves multiple functions: it reflects specific wavelength bands (operating and stimulating lights) while transmitting excitation light and fluorescence. The universal design of repetition layers with optimized H/L ratios allows the same structural motif to perform multiple wavelength separation tasks, reducing overall design complexity.
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
The filter achieves a very narrow reflection bandwidth, enabling efficient separation of specific wavelengths, enhancing fluorescence microscopy by allowing observation of multiple fluorescence lights and dynamic cell behavior with high precision.
Implementation Method 1
a repetition layer such that a sum of an average value of optical thickness of a high refractive index layer and an average value of optical thickness of a low refractive index layer is substantially equal to a reflection wavelength λ0 with respect to a vertically incident light
Implementation Method 2
a repetition layer such that a sum of an average value of optical thickness of a high refractive index layer and an average value of optical thickness of a low refractive index layer is substantially equal to a reflection wavelength λ0
Data Source
AI summary
A multilayer minus filter for reflecting a light having a predetermined wavelength and transmitting a light having a wavelength longer than and shorter than the predetermined wavelength, includes a repetition layer such that a sum of an average value of optical thickness of a high refractive index layer and an average value of optical thickness of a low refractive index layer is substantially equal to a reflection wavelength λ0 with respect to a vertically incident light, wherein, when a rate H/L between the optical thickness H of the high reflective index layer and the optical thickness L of the low reflective index layer in the repetition layer of the high refractive index layer and the low refractive index layer is larger than 0.5 and smaller than 2, a reflection band formed in the reflection wavelength λ0 by the repetition layer is utilized.