Compact beam expander with linear gratings

Shechter, Revital; Amitai, Yael; Friesem, Asher A.

doi:10.1364/ao.41.001236

Cited by 44 publications

(18 citation statements)

References 12 publications

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“…Grating coupler is a surface with many parallel grooves in a periodical manner, and it affects sensitivity in immunosensing applications of waveguide sensor [7]. Other potential sensing based applications of grating coupler are anti-reflector [8], bio-sensors [9], and beam expanders [10]. In planar waveguide sensor penetration depth of the evanescent field in cover medium is limited to 150 nm-200 nm, which is sufficient for the detection of lipids bilayer, protein adsorption, and affinity binding [11,12].…”

Section: Introductionmentioning

confidence: 99%

Analytical study of planar waveguide sensor with a metamaterial guiding layer

2017

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Sensitivities of three-layer and four-layer planar waveguide sensors having metamaterial as guiding layer are analyzed for p-polarization of incident light and compared with existing results. Proposed sensors show improved cover layer sensitivity for each case of the cover layer refractive index. Also, proposed sensors demonstrate improved adlayer sensitivity for different values of adlayer thickness and adlayer refractive indices. It is observed that metamaterial has increased the evanescent field due to the unconventional nature of it, by which values of cover layer sensitivity as well as adlayer sensitivity are enhanced.

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Section: Introductionmentioning

confidence: 99%

Analytical study of planar waveguide sensor with a metamaterial guiding layer

2017

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“…There are many approaches such as using prisms [3][4][5], projection systems [6][7][8], deformable membrane mirrors [9][10][11], retinal scanning [12][13][14][15], hybrid diffractive-refractive lenses [16,17], and optical waveguides [18][19][20][21][22][23][24] to realize a seethrough display and the most promising approach is an optical waveguide.…”

Section: Introductionmentioning

confidence: 99%

Portable waveguide display system with a large field of view by integrating freeform elements and volume holograms

et al. 2015

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A compact waveguide display system integrating freeform elements and volume holograms is presented here for the first time. The use of freeform elements can broaden the field of view, which limits the applications of a holographic waveguide. An optimized system can achieve a diagonal field of view of 45° when the thickness of the waveguide planar is 3mm. Freeform-elements in-coupler and the volume holograms outcoupler were designed in detail in our study, and the influence of grating configurations on diffraction efficiency was analyzed thoroughly. The offaxis aberrations were well compensated by the in-coupler and the diffraction efficiency of the optimized waveguide display system could reach 87.57%. With integrated design, stability and reliability of this monochromatic display system were achieved and the alignment of the system was easily controlled by the record of the volume holograms, which makes mass production possible.

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“…Optical see-through NED, which enables users to simultaneously observe real-world scenes and virtual scenes generated by a computer, has great potential [4]. To achieve a portable see-through NED, researchers have introduced freeform optics [5][6][7], retinal scanning [8][9][10], diffractive optics [11], and optical waveguides [12,13] to reduce the thickness and weight. Among these technologies, waveguides probably provide the most promising means to design ultrathin see-through NEDs [14].…”

Section: Introductionmentioning

confidence: 99%

Stray light and tolerance analysis of an ultrathin waveguide display

et al. 2015

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Waveguides are becoming increasingly popular in the field of near-eye display because of their low thickness and light weight. However, ghost stray light generated in the waveguide and the double-image problem caused by low parallelism precision seriously degrade the display quality. In this study, the causes of stray light are investigated, an effective solution is proposed, and a coupling-in structure is designed to suppress stray light. The Monte Carlo tolerances on the parallelism errors based on the visual acuity for the two substrates and the partially reflective mirror array (PRMA) of the waveguide are implemented. Results show that the fabrication accuracy of the substrates and the PRMA should be controlled within 6'' and 9'', respectively. A 2.4 mm thick waveguide with stray light of less than 1% is designed. The field of view is 36° in the pupil-expanding direction, and the diameter of the exit pupil is 11.6 mm at an eye relief of 20 mm. Finally, a proof-of-concept prototype is fabricated and demonstrated.

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Compact beam expander with linear gratings

Cited by 44 publications

References 12 publications

Analytical study of planar waveguide sensor with a metamaterial guiding layer

Analytical study of planar waveguide sensor with a metamaterial guiding layer

Portable waveguide display system with a large field of view by integrating freeform elements and volume holograms

Stray light and tolerance analysis of an ultrathin waveguide display

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