Extension of the useful focal length range of microlenses by oil immersion

Poon, Pch; Commander, L. G.; Selviah, David R.; Robinson, MG

doi:10.1088/1464-4258/1/2/004

Cited by 11 publications

(3 citation statements)

References 17 publications

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“…Based on the results of Fig. 7, the largest focal length is 4465 μm, which is much larger than that of a microlens fabricated by other methods [4][5][6][7]. The ultralong focal length is an advantage of this fabrication method.…”

Section: B Focal Length Of Mlamentioning

confidence: 82%

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Ultralong focal length microlens array fabricated based on SU-8 photoresist

et al. 2015

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In this paper, a novel method to fabricate ultralong focal length microlens arrays has been proposed. The microlens arrays were fabricated based on surface tension when heating temperature is over a glass transition temperature of SU-8 photoresist. An ultralong focal length was achieved by the large radius of curvature of a photoresist surface. Microlenses of widths from 30 to 210 μm were successfully fabricated. The longest focal length was up to 4.4 mm from the microlens of 210 μm width. The formation mechanism was also studied and validated by simulation based on the finite element method.

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Section: B Focal Length Of Mlamentioning

confidence: 82%

“…Long focal length MLA is a vital optical element, which decides the performance of SHWS [2,3]. In recent years, many fabrication methods [4][5][6][7][8] were proposed to create a long focal length microlens or extend the focal length of MLA. The thermal reflow method has been proposed for many years [9,10].…”

Section: Introductionmentioning

confidence: 99%

Ultralong focal length microlens array fabricated based on SU-8 photoresist

et al. 2015

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“…The transparent nanolens structure has a convex feature, and thus can work as a lens. In conventional optics, focusing size and depth are limited by diffraction phenomenon 46 47 . A solid immersion lens has been shown to have the potential to overcome the diffraction limit by filling an object space with a solid material, that has a high-refractive index 47 48 49 50 .…”

Section: Resultsmentioning

confidence: 99%

Incident light adjustable solar cell by periodic nanolens architecture

Yun

Lee

Park

et al. 2014

Sci Rep

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Could nanostructures act as lenses to focus incident light for efficient utilization of photovoltaics? Is it possible, in order to avoid serious recombination loss, to realize periodic nanostructures in solar cells without direct etching in a light absorbing semiconductor? Here we propose and demonstrate a promising architecture to shape nanolenses on a planar semiconductor. Optically transparent and electrically conductive nanolenses simultaneously provide the optical benefit of modulating the incident light and the electrical advantage of supporting carrier transportation. A transparent indium-tin-oxide (ITO) nanolens was designed to focus the incident light-spectrum in focal lengths overlapping to a strong electric field region for high carrier collection efficiency. The ITO nanolens effectively broadens near-zero reflection and provides high tolerance to the incident light angles. We present a record high light-conversion efficiency of 16.0% for a periodic nanostructured Si solar cell.

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