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Single-mode GaN nanowire lasers

Optics Express

Li, Qiming L.; Wright, Jeremy B.; Chow, Weng W.; Luk, Ting S.; Brener, Igal; Lester, Luke F.; Wang, George T.

We demonstrate stable, single-frequency output from single, asfabricated GaN nanowire lasers operating far above lasing threshold. Each laser is a linear, double-facet GaN nanowire functioning as gain medium and optical resonator, fabricated by a top-down technique that exploits a tunable dry etch plus anisotropic wet etch for precise control of the nanowire dimensions and high material gain. A single-mode linewidth of ∼0.12 nm and >18dB side-mode suppression ratio are measured. Numerical simulations indicate that single-mode lasing arises from strong mode competition and narrow gain bandwidth. © 2012 Optical Society of America.

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TYPE Journal Article YEAR 2012
ScopusOSTIDOI

Top-down fabrication of GaN-based nanorod LEDs and lasers

Proceedings of SPIE - The International Society for Optical Engineering

Wang, George T.; Li, Qiming L.; Wierer, Jonathan J.; Figiel, Jeffrey J.; Wright, Jeremy B.; Luk, Ting S.; Brener, Igal

Although planar heterostructures dominate current optoelectronic architectures, 1D nanowires and nanorods have distinct and advantageous properties that may enable higher efficiency, longer wavelength, and cheaper devices. We have developed a top-down approach for fabricating ordered arrays of high quality GaN-based nanorods with controllable height, pitch and diameter. This approach avoids many of the limitations of bottom-up synthesis methods. In addition to GaN nanorods, the fabrication and characterization of both axial and radial-type GaN/InGaN nanorod LEDs have been achieved. The precise control over nanorod geometry achiveable by this technique also enables single-mode single nanowire lasing with linewidths of less than 0.1 nm and low lasing thresholds of ∼250kW/cm 2. © 2012 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

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TYPE Conference YEAR 2012
OSTIScopus

A Summary of the Theory and Design Team Efforts for the Sandia Metamaterials Science and Technology Grand Challenge LDRD

Basilio, Lorena I.; Brener, Igal; Burckel, David B.; Shaner, Eric A.; Wendt, Joel R.; Luk, Ting S.; Ellis, A.R.; Bender, Daniel A.; Clem, Paul; Rasberry, Roger D.; Langston, William L.; Ihlefeld, Jon F.; Dirk, Shawn M.; Warne, Larry K.; Peters, David; El-Kady, Ihab F.; Reinke, Charles M.; Loui, Hung; Williams, Jeffery T.; Sinclair, Michael B.; Mccormick, Frederick B.

Abstract not provided.

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TYPE Presentation YEAR 2012
OSTI

Interactions in 2D and 3D mid-infrared metamaterials

2011 5th Rio De La Plata Workshop on Laser Dynamics and Nonlinear Photonics, LDNP 2011

Brener, Igal

We explore the issue of interactions between metamaterial resonators and different types of absorbers placed in proximity to these resonators. Very clear anticrossing behaviour and level splitting is observed when IR phonons interact with planar metamaterials. More complex dipole transitions can be designed using semiconductor bandgap engineering. We show experimentally the coupling between metamaterial resonances and intersubband transitions and discuss this mechanism for electrical tuning of metamaterials throughout the optical infrared spectral region. Finally we will discuss interactions in 3D dielectric resonator metamaterials. © 2011 IEEE.

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TYPE Conference YEAR 2011
OSTIScopus

Multilayer infrared metamaterial fabrication using membrane projection lithography

Journal of Vacuum Science and Technology. B, Nanotechnology and Microelectronics

Wendt, Joel R.; Brener, Igal; Sinclair, Michael B.

Membrane projection lithography is extended from a single layer fabrication technique to a multilayer process, adding polymeric backfill and planarization after each layer is completed. Unaligned contact lithography is used as a rapid prototyping tool to aid in process development, patterning resist membranes in seconds without requiring long e-beam write times. The fabricated multilayer structures show good resistance to solvent attack from subsequent process steps and demonstrate in-plane and out of plane multilayer metallic inclusions in a dielectric host, which is a critical step in the path to develop bulklike metamaterials at optical frequencies.

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TYPE Journal Article YEAR 2011
OSTIDOI
Results 351–400 of 451
Results 351–400 of 451