Design and Fabrication of a Cost-Effective Optical Notch Filter for Improving Visual Quality
Source abstract
Abstract
This study presents a multilayer design and fabrication of an optical notch filter for enhancing visual quality. A cost-effective multilayer design of notch filter with low surface roughness and low residual stress is proposed. A 9-layer notch filter composed of SiO2 and Nb2O5 with a central wavelength of 480 nm is prepared by electron beam evaporation combined with ion-assisted deposition. The optical transmittance, residual stress, and surface morphology are measured by a UV/VIS/NIR spectrophotometer, Twyman-Green interferometer and field emission scanning electron microscopy (FE-SEM). The transmittance of the notch filter at the central wavelength is above 15%, and the average transmittance of the transmission band is about 80%. The residual stress of the notch filter is −0.235 GPa, and the root mean square surface roughness is 1.85 nm. For improving the visual quality, a good image contrast can be obtained by observing the microscopic image using the proposed notch filter.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Optical Coatings and Gratings · Surface Roughness and Optical Measurements · Thin-Film Transistor Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Electrical Engineering, Feng Chia University, Taichung 40724, Taiwan
Ph.D. Program of Electrical and Communications Engineering, Feng Chia University, Taichung 40724, Taiwan
Department of Optometry, Chung Shan Medical University, Taichung 40201, Taiwan
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