Design and Fabrication of a Narrow Bandpass Filter with Low Dependence on Angle of Incidence

Jen, Yi‐Jun; Lin, Meng‐Ju

doi:10.3390/coatings8070231

Cited by 18 publications

(7 citation statements)

References 15 publications

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“…In this work, the open-source software, Open Filters, and its needle function are used to optimize the designs of DBR and FP filters based TiO 2 / SiO 2 [23,25]. To decrease the stimulation time, an initial DBR design close to the required design can be synthesized using H(LH) p layer configuration [11,16,20,26,27], where H and L are quarter-wave thick of high and low refractive index layers and p is the number of repeated high and low refractive index pairs. Similarly, an initial FP filter design with layer structure of H(LH) q 2L H(LH) q was chosen, in which H(LH) q represents the top and the bottom DBR, 2L describes a half wavelength cavity.…”

Section: Optimization Designs and Discussionmentioning

confidence: 99%

Designing multilayer dielectric filter based on TiO2/SiO2 for fluorescence microscopy applications

Hong

2020

Computer Optics

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This study presents a new construction design of a distributed Bragg reflector (DBR) filter and a Fabry–Pérot (FP) filter by using needle technique as a synthesis method. The optimized DBR and FP filters having a proper number of layers with controlling thickness TiO2/SiO2 are utilized to transmit only a certain narrow band of wavelengths while blocking the others. As a proof of concept, the filters are designed to selectively transmit only a very narrow band of wavelength at 780 nm which is the near infrared (NIR) fluorescent emission from Alexa Fluor 750 dye. The obtained results show that the optimized filters represent advanced spectral performance which can be used to improve the sensitivity and the imaging contrast in fluorescence microscopy.

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Section: Optimization Designs and Discussionmentioning

confidence: 99%

Designing multilayer dielectric filter based on TiO2/SiO2 for fluorescence microscopy applications

Hong

2020

Computer Optics

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“…Essentially, the band-pass optical filter, in principle, is constructed by the Fabry–Pèrot interferometer. More recently, Jen et al [ 18 ] proposed a modified Fabry–Pèrot filter design to implement a wide-angle band-pass optical filter based on a normalized admittance diagram.…”

Section: Introductionmentioning

confidence: 99%

Wide-Angular Tolerance Optical Filter Design and Its Application to Green Pepper Segmentation

Shu

Kurihara

2023

Sensors

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The optical filter is critical in many applications requiring wide-angle imaging perception. However, the transmission curve of the typical optical filter will change at an oblique incident angle due to the optical path of the incident light change. In this study, we propose a wide-angular tolerance optical filter design method based on the transfer matrix method and automatic differentiation. A novel optical merit function is proposed for simultaneous optimization at normal and oblique incidents. The simulation results demonstrate that such a wide-angular tolerance design can realize a similar transmittance curve at an oblique incident angle compared to a normal incident angle. Furthermore, how much improvement in a wide-angular optical filter design for oblique incident contributes to image segmentation remains unclear. Therefore, we evaluate several transmittance curves along with the U-Net structure for green pepper segmentation. Although our proposed method is not perfectly equal to the target design, it can achieve an average 50% smaller mean absolute error (MAE) than the original design at 20∘ oblique incident angle. In addition, the green pepper segmentation results show that wide-angular tolerance optical filter design improves the segmentation of the near-color object about 0.3% at 20∘ oblique incident angle compared to the previous design.

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“…Color filters, including chemical filters and optical filters, were used to select light waves with specific wavelengths in the visible range, which led to wide applications in the field of display [ 1 , 2 ], imaging [ 3 , 4 , 5 ], color printing [ 6 , 7 ], and color decoration [ 8 , 9 ]. With advances of the high reliability under UV radiation and high-temperature environment, optical filters based on multiple-layer thin film, Fabry–Perot resonant cavity [ 10 , 11 ], photonic crystals [ 12 , 13 , 14 ], and gratings [ 15 , 16 ] are more popular in practical applications than the organic-dye-based chemical filters.…”

Section: Introductionmentioning

confidence: 99%

Green Reflector with Predicted Chromatic Coordinates

et al. 2023

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The color reflector with multiple-layer thin film scheme has attracted much attention because of the potential for massive production by wafer-scale deposition and the possibility to integrate with photonics (semiconductor) devices. Here, an angle-insensitive green reflector with a simple multilayer dielectric thin film structure was reported, with predicted chromatic coordinates based on CIE 1931 standard. The SiN/SiO2 multilayer thin film stack, including a special silicon-rich nitride material with ultrahigh refractive index, was grown alternatively by an inductively coupled plasma chemical vapor deposition (ICPCVD) system at a low stage temperature of 80 °C. The green reflector showed a maximum reflectivity of 73% around 561 nm with a full width at half maximum (FWHM) of 87 nm in the visible wavelength range, which contributed significantly to its color appearance. The measurement by an angle-resolved spectrometer under the illumination of p/s-polarized light wave with a variable angle of incidence indicated that the reflectance spectrum blue-shifted slightly with the increasing of incident angle such that the green color could be kept.

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Design and Fabrication of a Narrow Bandpass Filter with Low Dependence on Angle of Incidence

Cited by 18 publications

References 15 publications

Designing multilayer dielectric filter based on TiO2/SiO2 for fluorescence microscopy applications

Designing multilayer dielectric filter based on TiO2/SiO2 for fluorescence microscopy applications

Wide-Angular Tolerance Optical Filter Design and Its Application to Green Pepper Segmentation

Green Reflector with Predicted Chromatic Coordinates

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