Dichroic mirrors, as core optical elements, are widely used in biomedical testing instruments based on the principles of absorbance detection, fluorescence detection and Raman detection. In this paper, the application principle of dichroic mirrors for biomedical detection was introduced, and some key technical indexes for high-performance dichroic mirrors were proposed according to their application characteristics. With the equivalent layer substitution method, a dichroic mirror film system of high-performance based on two conventional materials was designed. Using the plasma assisted reactive magnetron sputtering technology, the dichroic mirror film system with 146 layers was coated, and a kind of dichroic mirror with some important technical indicators such as high steepness (<1%), depolarization (polarization separation <3.5nm), wide range of high transmission (T>96% range > 300nm) was manufactured. The influence of wavefront distortion of dichroic mirror on imaging was described in detail. Our dichroic mirrors can meet the performance of low transmitted wavefront distortion (TWD<λ/4) and low reflected wavefront distortion (RWD<λ/2). The manufactured dichroic mirror products showed satisfying application results when used in high-end medical testing instruments with fine imaging requirements.
Analyzed the technical requirements of filter sets applied in 6-channel Quantitative Real-time PCR nucleic acid detection, and these filters meet the requirements were designed with double sides coating on single glass substrate, while each coating was about 200 layers. These coatings were manufactured on a plasma-assisted reactive magnetic sputtering (PARMS) machine, and the thickness error is less than 0.1%. Finally, the transmittance rates of these 6-channel real-time fluorescence PCR filters are <93%, the cut-off steepness was less than 1%, and the crosstalk was less than 1% in polychromatic fluorescence PCR.
The technical requirements and development trends of optical filters applied in bioscience area were introduced in this paper. The related optical filters were mainly used in biomedical equipment which were based on biomedical optical testing methods, such as absorption photometric analysis, fluorescence analysis, and Raman analysis etc. To manufacture the optical filters, Plasma Assisted Reactive Magnetron Sputtering (PARMS) technology was used, super-multilayer precision thickness control methods and super-multilayer micro defect control technology were developed. The high performance optical thin film filters, with high transmission (Tpk>95%), steep edge (OD6 cut-off steepness less than 1%) and deep blocking with neighborhood cut-off depth blocking better than OD7 were manufactured.
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