We experimentally demonstrate a functional silicon metadevice at telecom wavelengths that can efficiently control the wavefront of optical beams by imprinting spatially varying transmittance phase independent polarization incident beam. Near-unity efficiency and close to 0–2π coverage are enabled utilizing localized electric magnetic Mie-type resonances low-loss nanoparticles tailored behave as electromagnetically dual-symmetric scatterers. apply this concept realize converts Gaussian beam...

Solid‐state lighting has made tremendous progress this past decade, with the potential to make much more over coming decade. In article, current status of solid‐state relative its ultimate be “smart” and ultra‐efficient is reviewed. Smart, would enable both very high “effective” efficiencies potentially large increases in human performance. To achieve ultra‐efficiency, phosphors must give way multi‐color semiconductor electroluminescence: some technological challenges associated such...

Metasurfaces have shown great promise for the control of optical wavefronts, thus opening new pathways development efficient flat optics. In particular, Huygens' metasurfaces based on all-dielectric resonant meta-atoms already a huge potential practical applications with their polarization insensitivity and high transmittance efficiency. Here, we experimentally demonstrate polarization-insensitive holographic metasurface dielectric capable complex wavefront at telecommunication wavelengths....

Abstract Here, we review the progress and most recent advances in phonon-polaritonics, an emerging growing field that has brought about a range of powerful possibilities for mid- to far-infrared (IR) light. These extraordinary capabilities are enabled by resonant coupling between impinging light vibrations material lattice, known as phonon-polaritons (PhPs). PhPs yield characteristic optical response certain materials, occurring within IR spectral window reststrahlen band. In particular,...

Photonic crystals of close-packed arrays air spheres in a dielectric background titania have been fabricated with ceramic technique. Unlike previous methods, ordering the and formation network are performed simultaneously. The photonic exhibit reflectance peak uniform color at position first stop band. wavelength scales very well sphere size.

Classes of colloidal dielectric systems are found with full three-dimensional photonic band gaps, using band-structure calculations. The fcc structure composed from either high spheres or low has gaps and lower-frequency pseudogaps. $\mathrm{AB}2$ a higher-frequency pseudogap.

We demonstrate epsilon near zero (ENZ) metamaterials operating at visible wavelengths 660 nm. The structure consists of a multilayer stack composite alternating layers Ag and TiO2, 16 nm 54 thick, respectively. found that high refractive index material like TiO2 (n ∼ 2.3) is preferable to lower achieve good “mixing” resulting in better approximates homogenous effective medium. Optical spectroscopy shows transmission absorption responses are consistent with ENZ behavior match well...

Enhancing and funneling light efficiently through deep subwavelength apertures is essential in harnessing light-matter interaction. Thus far, this has been accomplished resonantly, by exciting the structural surface plasmons of perforated nanostructured metal films, a phenomenon known as extraordinary optical transmission. Here, we present new paradigm structure which possesses all capabilities transmission platforms, yet operates nonresonantly on distinctly different mechanism. Our proposed...

Emerging applications such as solid-state lighting and display technologies require micro-scale vertically emitting lasers with controllable distinct lasing wavelengths broad wavelength tunability arranged in desired geometrical patterns to form "super-pixels". Conventional edge-emitting current surface-emitting that abrupt changes semiconductor bandgaps or cavity length are not a viable solution. Here, we successfully address these challenges by introducing new paradigm extends the laser...

Photonic analogs of electronic systems with topologically non-trivial behavior such as unidirectional scatter-free propagation has tremendous potential for transforming photonic systems. Like in electronics topological can be observed photonics either preserving time-reversal (TR) symmetry or explicitly breaking it. TR requires magneto-optic crystals (PC) generation synthetic gauge fields. For on-chip that operate at optical frequencies both are quite challenging because poor response...

We demonstrate the fabrication of a three-dimensional woodpile photonic crystal in near-infrared using layer-by-layer approach involving electron beam lithography and spin on glass planarization. The alignment accuracy between first fifth layer is within 10% lattice spacing as measured from cross section scanning-electron-microscopy images. Optical reflectivity measurements reveal peaks consistent with gap frequency. method offers way rapid prototyping full band devices considerable...

Three-dimensional photonic crystals with an omnidirectional bandgap at visible frequencies can have significant impact on solid-state lighting and solar-energy conversion. Using a procedure based multistep electron-beam lithographic processing, 9-layer log-pile crystal is fabricated composed of 70-nm-wide titanium dioxide rods 250-nm lattice spacing that exhibit stacking direction between 400 nm 500 (see image). Detailed facts importance to specialist readers are published as "Supporting...

We demonstrate a new route to the precision fabrication of epitaxial semiconductor nanostructures in sub-10 nm size regime: quantum-size-controlled photoelectrochemical (QSC-PEC) etching. show that quantum dots (QDs) can be QSC-PEC-etched from InGaN thin films using narrowband laser photoexcitation, and QD sizes (and hence bandgaps photoluminescence wavelengths) are determined by photoexcitation wavelength. Low-temperature ensembles such QDs have peak wavelengths tunably blue shifted 35...

Recent work on a technique for fabricating inverse fcc photonic crystals from colloidal system of monodisperse microspheres and titania nanoparticles is described. The can be used to produce with other background materials that are available as nanoparticles. Figure shows the Moiré pattern typical crystal sample.

Colloidal inverse photonic crystals composed of ordered lattices air spheres in a high dielectric background are found to have three-dimensional gaps for face-centered cubic, hexgaonal close-packed, and double hexagonal close-packed stacking sequences. Conditions the occurrence complete gap sufficient contrast geometry near close packed. Although lower pseudogaps these sequences differ, lowest stop band direction is insensitive sequence; hence their experimental reflection should be similar....

Photonic crystals (PC) have emerged as important types of structures for light manipulation. Ultimate control is possible by creating PCs with a complete three dimensional (3D) gap [1, 2]. This has proven to be considerable challenge in the visible and ultraviolet frequencies mainly due complications integrating transparent, high refractive index (n) materials fabrication techniques create ~ 100nm features long range translational order. In this letter, we demonstrate nano-lithography...

We demonstrate a nine-layer logpile three-dimensional photonic crystal (3DPC) composed of single crystalline gallium nitride (GaN) nanorods, ∼100 nm in size with lattice constants 260, 280, and 300 band gap the visible region. This unique GaN structure is created through combined approach layer-by-layer template fabrication technique selective metal organic chemical vapor deposition (MOCVD). These 3DPC exhibit stacking direction characterized by strong optical reflectance between 380 500 nm....

We demonstrate experimentally signatures and dispersion control of surface plasmon polaritons from 1 to 1.8 µm using periodic multilayer metallo-dielectric hyperbolic metamaterials. The fabricated structures are comprised smooth films with very low metal filling factor. measured properties these metamaterials agree well calculations transfer matrix, finite-difference time-domain, effective medium approximation methods despite only 2.5 periods. enhancement factor in the local photonic density...

We show that a scanning capacitance microscope (SCM) can image buried delta-doped donor nanostructures fabricated in Si via recently developed atomic-precision tunneling microscopy (STM) lithography technique. A critical challenge completing nanoelectronic devices is to accurately align mesoscopic metal contacts the STM defined nanostructures. Utilizing SCMs ability dopant nanostructures, we have technique by which are able position electrodes on surface form underlying with measured...

We have demonstrated a binary chemoselective gas sensor using combination of plasmonic nanohole arrays and voltage-directed assembly diazonium chemistry. The employment functionalization allows for the realization multiplexed sensor. device was read optically fabricated electron-beam conventional lithography; it contains several regions each electrically isolated from other. used calibrated dosage delivery to confirm selectivity observed reversible spectral shifts nm upon exposure. resulting...

The Energy Frontier Research Center (EFRC) for Solid-State Lighting Science (SSLS) is one of 46 EFRCs initiated in 2009 to conduct basic and use-inspired research relevant energy technologies. overarching theme the SSLS EFRC exploration conversion tailored photonic structures. In this article we review highlights from EFRC. Major themes include: studies materials properties emission characteristics III-nitride semiconductor nanowires; development new phosphors II–VI quantum dots use as...

We have developed a novel ceramic processing technique to fabricate photonic crystals (PCs) with close-packed lattices of air pores in dielectric background. The ordering colloidal spheres and incorporation the titania is performed simultaneously, contrast other approaches. Excellent lattice achieved over domains extending 100 /spl mu/. PCs exhibit uniform color corresponding sharp peak reflectivity at wavelength first stopband. position scales very well size pores, providing strong evidence...

We quantitatively analyze the structure of thin film inverse-opal photonic crystals composed ordered arrays air pores in a background titania. Ordering sphere template and introduction titania were performed simultaneously crystals. Nondestructive optical measurements backfilling with high refractive index liquids, angle-resolved reflectivity, spectroscopy combined band-structure calculations. The analysis reveals crystal very filling fraction (92--94 %) substantial compression along c axis...