Using a pair of antireflection layer in a minus filter to suppress ripples in the HUD-beam combiner

Shankar, Ajay; Kumar, Sunil

doi:10.1007/s12596-014-0188-7

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…In the application of optoelectronic devices, the notch filter is an optical interference filter commonly used to control the transmission and reflection of light. The optical notch filter has a variety of functions; for example, it can be applied to projection displays, head-up displays (HUD) and various optical products [16,17]. For head-up displays, lasers or light-emitting diodes (LEDs) of specific wavelengths are generally used as light sources.…”

Section: Introductionmentioning

confidence: 99%

Design and Fabrication of a Cost-Effective Optical Notch Filter for Improving Visual Quality

et al. 2021

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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.

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Section: Introductionmentioning

confidence: 99%

Design and Fabrication of a Cost-Effective Optical Notch Filter for Improving Visual Quality

et al. 2021

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“…Therefore, many HUDs use green LED as the light source. The notch filter applied to HUD must have a reflectivity of more than 80% at a specific wavelength before the projected image can be easily recognized by the human eye [6].…”

Section: Introductionmentioning

confidence: 99%

Design and Fabrication of Laser Protective Lenses Based on Multilayered Notch Filter with Low Residual Stress and Low Surface Roughness

et al. 2021

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We present a new laser protective lens based on a multilayered notch filter design with low residual stress and low surface roughness. An18-layer notch filter was prepared by electron beam evaporation with an ion-assisted deposition technique, which was composed of SiO2 and Nb2O5 with a center wavelength of 532 nm. The optical transmittance, residual stress, surface roughness, and surface morphology were measured by a UV/VIS/NIR spectrophotometer, Twyman–Green interferometer, scanning probe microscope, Linnik microscopic interferometer, and field-emission scanning electron microscopy (FE-SEM). The transmittance of the notch filters at center wavelength is 0.2%, and the average transmittance of the transmission band is about 70%. The residual stress of the notch filter is −0.298 GPa, and the root mean square surface roughness is 1.88 nm. The experimental results show that the optical transmittance meets the design requirements.

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“…Optical anti-reflective surfaces are widely used in solar cells, optical sensors, and other optical devices [1][2][3][4]. Effective reduction of reflectance is a key method in improving the performance of materials and devices.…”

Section: Introductionmentioning

confidence: 99%

Improved antireflection based on biomimetic nanostructures at material interface

Zhang¹,

Song²

2018

J. Opt.

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Reducing light reflections on the surface of materials has important applications in many fields, such as solar cells, photodetectors, and optical sensors, etc. An effective method of decreasing reflection is using the anti-reflective coating with a gradient refractive index. In this study, we designed a nanostructure composed of optimized cone arrays on the flat thin film surface. The tapered nanostructure forms an anti-reflection layer. The effective refractive index of the antireflection layer changes smoothly with the depth so that the surface can efficiently reduce the reflection in a wide visible light range. Moreover, the reflection can also be modulated by adjusting the height and the period of the nanocones. Furthermore, there is an optimal wavelength at which the highest anti-reflection efficiency is achieved. The results here provide a theoretical guidance for the practical design of broadband anti-reflection nanostructures at the device surface.

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Using a pair of antireflection layer in a minus filter to suppress ripples in the HUD-beam combiner

Cited by 7 publications

References 2 publications

Design and Fabrication of a Cost-Effective Optical Notch Filter for Improving Visual Quality

Design and Fabrication of a Cost-Effective Optical Notch Filter for Improving Visual Quality

Design and Fabrication of Laser Protective Lenses Based on Multilayered Notch Filter with Low Residual Stress and Low Surface Roughness

Improved antireflection based on biomimetic nanostructures at material interface

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