Computational modelling of a graphene Fresnel lens on different substrates

Deng, Sunan; Yetisen, Ali K.; Jiang, Kyle; Butt, Haider

doi:10.1039/c4ra03991b

Cited by 27 publications

(16 citation statements)

References 39 publications

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“…Therefore, to pattern the alternating zones by FS laser ablation, it is necessary to study the limitation of the spot size of the laser beam (20 µm). This led us to determine the radius (d) of rings and their numbers(n) with the wavelength of incident light (λ) to measure the focal length, = 2 / λ, ( = 1,2,3 … ) [37], where is the radius and is the number of rings, and λ is the wavelength of the incident light [38][39][40]. The focal length and optical wavelength were set to (f=39.5 cm for 633 nm, 47 cm for 533 nm, and 56 cm for 450 nm) with nine rings.…”

Section: Fft-based Design and Fabrication Of Microphotonic Devicesmentioning

confidence: 99%

Femtosecond laser ablation of transparent microphotonic devices and computer-generated holograms

et al. 2017

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Femtosecond laser ablation allows direct patterning of engineering materials in industrial settings without requiring multistage processes such as photolithography or electron beam lithography. However, femtosecond lasers have not been widely used to construct volumetric microphotonic devices and holograms with high reliability and cost efficiency. Here, a direct femtosecond laser writing process is developed to rapidly produce transmission 1D/2D gratings, Fresnel Zone Plate lenses, and computer-generated holograms. The optical properties including light transmission, angle-dependent resolution, and light polarization effects for the microphotonic devices have been characterized. Varying the depth of the microgratings from 400 nm to 1.5 μm allowed the control over their transmission intensity profile. The optical properties of the 1D/2D gratings were validated through a geometrical theory of diffraction model involving 2D phase modulation. The produced Fresnel lenses had transmission efficiency of ∼60% at normal incidence and they preserved the polarization of incident light. The computer-generated holograms had an average transmission efficiency of 35% over the visible spectrum. These microphotonic devices had wettability resistance of contact angle ranging from 44° to 125°. These devices can be used in a variety of applications including wavelength-selective filters, dynamic displays, fiber optics, and biomedical devices.

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Section: Fft-based Design and Fabrication Of Microphotonic Devicesmentioning

confidence: 99%

Femtosecond laser ablation of transparent microphotonic devices and computer-generated holograms

et al. 2017

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“…To study the enhanced FZP lens in 2D, the properties of graphene nanoring/nanoribbon arrays were studied by FDTD method, in which the lenses were illuminated perpendicularly by a plane wave. In the infrared regime, the contribution of interband for surface conductivity of graphene can be neglected and the conductivity can be approximated with a Drude expression: 44 sðuÞ ¼…”

Section: Properties Of Graphene Nrsmentioning

confidence: 99%

Graphene nanoribbon based plasmonic Fresnel zone plate lenses

et al. 2017

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“…The realization of foreign direct investment and increasing export of expertise are vital channels for global integration and technology transfer through multinational corporations. [6][7][8][9][10][11][12][13][14][15][16][17][18] These sectors require smaller, lighter, faster, more efficient and functional components at the nano/microscales. [1][2][3] Increasing investment in research is an incentive for universities to raise revenues by licensing intellectual property (IP) and spinning off companies.…”

Section: The University Entrepreneurmentioning

confidence: 99%

Entrepreneurship

et al. 2015

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High-tech businesses are the driving force behind global knowledge-based economies. Academic institutions have positioned themselves to serve the high-tech industry through consulting, licensing, and university spinoffs. The awareness of commercialization strategies and building an entrepreneurial culture can help academics to efficiently transfer their inventions to the market to achieve the maximum value. Here, the concept of high-tech entrepreneurship is discussed from lab to market in technology-intensive sectors such as nanotechnology, photonics, and biotechnology, specifically in the context of lab-on-a-chip devices. This article provides strategies for choosing a commercialization approach, financing a startup, marketing a product, and planning an exit. Common reasons for startup company failures are discussed and guidelines to overcome these challenges are suggested. The discussion is supplemented with case studies of successful and failed companies. Identifying a market need, assembling a motivated management team, managing resources, and obtaining experienced mentors lead to a successful exit.

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Computational modelling of a graphene Fresnel lens on different substrates

Abstract: In this work we studied tunable lensing effects of graphene Fresnel lens on different substrates with incident light of 850 nm and 1550 nm wavelengths.

Cited by 27 publications

References 39 publications

Femtosecond laser ablation of transparent microphotonic devices and computer-generated holograms

Femtosecond laser ablation of transparent microphotonic devices and computer-generated holograms

Graphene nanoribbon based plasmonic Fresnel zone plate lenses

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