Journal ArticleDOI
Aperiodic arrays of active nanopillars for radiation engineering
TLDR
In this article, aperiodic nanostructures for enhanced omnidirectional light extraction and coupling of 1.55μm radiation to distinctive optical resonances carrying of orbital angular momentum (OAM) using light emitting Si-based materials were designed.Abstract:
We engineer aperiodic nanostructures for enhanced omnidirectional light extraction and coupling of 1.55 μm radiation to distinctive optical resonances carrying of orbital angular momentum (OAM) using light emitting Si-based materials. By systematically studying nanopillar arrays with varying pillar separations and increasing degree of rotational symmetry in Fourier space, we show that omnidirectional extraction is achieved with circularly symmetric Fourier space, leading to best light emission enhancement from planar devices such as LEDs or lasers. To demonstrate the potential of active aperiodic structures with azimuthally isotropic k-space, we fabricate nanopillar arrays of erbium doped silicon-rich nitride using electron beam lithography and reactive ion etching. Experimental results obtained using leaky-mode photoluminescence spectroscopy prove over 10 times extraction enhancement at 1.55 μm from aperiodic golden angle spirals (GA spirals), in good agreement with design based on analytical Bragg scatt...read more
Citations
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Journal ArticleDOI
Flat Optics With Designer Metasurfaces
Nanfang Yu,Federico Capasso +1 more
TL;DR: This Review focuses on recent developments on flat, ultrathin optical components dubbed 'metasurfaces' that produce abrupt changes over the scale of the free-space wavelength in the phase, amplitude and/or polarization of a light beam.
Journal ArticleDOI
Metallic nanostructures for efficient LED lighting
TL;DR: A general overview of state-of-the-art LED lighting, discussing the main characteristics required of both quantum wells and color converters to efficiently generate white light and the main challenges in this field as well as the potential of metallic nanostructures to circumvent them.
Journal ArticleDOI
Highly efficient beam steering with a transparent metasurface.
TL;DR: An ultra-thin planar metasurface with phase discontinuities for highly efficient beam steering that benefits from the broadband transparency and flexible phase modulation of stacked metal/dielectric multi-layers that is perforated with coaxial annular apertures is proposed.
Journal ArticleDOI
Recent advances in high-contrast metastructures, metasurfaces, and photonic crystals
TL;DR: In this paper, the authors provide a generalized theoretical understanding of high-index-contrast near-wavelength dielectric structures on flat surfaces, known as highcontrast metastructures (HCMs) or metasurfaces, and show their intrinsic connections.
Journal ArticleDOI
A Review on Metasurface: From Principle to Smart Metadevices
TL;DR: In this paper, the progress of the research on metasurfaces is illustrated, and the development of soft metamaterials opens up a new dimension of application zone in conformal or wearable photonics.
References
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Journal ArticleDOI
Light Propagation with Phase Discontinuities: Generalized Laws of Reflection and Refraction
Nanfang Yu,Patrice Genevet,Patrice Genevet,Mikhail A. Kats,Francesco Aieta,Francesco Aieta,Jean-Philippe Tetienne,Jean-Philippe Tetienne,Federico Capasso,Zeno Gaburro,Zeno Gaburro +10 more
TL;DR: In this article, a two-dimensional array of optical resonators with spatially varying phase response and subwavelength separation can imprint phase discontinuities on propagating light as it traverses the interface between two media.
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Increase in the extraction efficiency of GaN-based light-emitting diodes via surface roughening
TL;DR: In this paper, an n-side-up GaN-based LED with a hexagonal "conelike" surface has been fabricated by using the laser lift-off technique followed by an anisotropic etching process to roughen the surface.
Journal ArticleDOI
Illumination with solid state lighting technology
Daniel A. Steigerwald,Jerome Chandra Bhat,D. Collins,R.M. Fletcher,M.O. Holcomb,M. J. Ludowise,Paul S. Martin,Serge L Rudaz +7 more
TL;DR: In this article, the authors describe the current state of high-power LED technology and the challenges that lay ahead for development of a true "solid state lamp" and demonstrate record performance and reliability for high power colored and white LEDs and show results from the worlds first 100-plus lumen white LED lamp.
Journal ArticleDOI
Advances in optical angular momentum
TL;DR: The concept of orbital angular momentum is now leading to new understanding of a wide range of phenomena, including fundamental processes in Bose-Einstein condensates, while the associated technologies have led to new applications in optical tweezing and microscopy as mentioned in this paper.
Journal ArticleDOI
III -nitride photonic-crystal light-emitting diodes with high extraction efficiency
TL;DR: In this article, a photonic-crystal structure for superior optical mode control was proposed for blue light-emitting diodes with a light extraction efficiency of 73% using InGaN-GaN devices.