Photonics Spectra: optoelectronic devices This is the syndication feed for Photonics Spectra: optoelectronic devices. https://www.photonics.com/Splash.aspx?Tag=optoelectronic+devices Thu, 28 Mar 2024 07:17:25 GMT Fri, 04 Aug 2023 07:00:00 GMT 1800 SPIE Adds 89 Senior Members
SPIE has added 89 new senior members from academia, industry, and government, from across 17 countries. The members work in a variety of disciplines, including nanophotonics, quantum optics, biomedical engineering, free space optical communications, optical microscopy, optical systems engineering, medical imaging, lidar, machine learning, optoelectronic devices, micro-structured optical fiber technology, astronomical optics, and lithography.

SPIE senior members are society members of distinction who are recognized for their professional experience and technical accomplishments, for their active involvement with the optics community and with SPIE, and for significant performance that sets them apart from their peers. For more...]]>
https://www.photonics.com/Articles/SPIE_Adds_89_Senior_Members/p5/a69217 A69217 Fri, 04 Aug 2023 07:00:00 GMT
Nanoscale Spectroscopy Supports Optoelectronic Device Architectures
2D semiconductors based on heterostructures are attracting attention as potential next-generation materials for the electronics industry. However, it is challenging to commercialize these materials because the physical properties of their quasiparticles themselves cannot be precisely controlled.

Researchers at Pohang University of Science and Technology (POSTECH) and ITMO University addressed this bottleneck, producing a tip-enhanced photoluminescence (TEPL) spectroscopy system that controlled the quasiparticles of a 2D material in a small space. The spectroscopy system dynamically controls the physical properties of quasiparticles under room temperature conditions. Further, it can be used to analyze the optical characteristics of...]]>
https://www.photonics.com/Articles/Nanoscale_Spectroscopy_Supports_Optoelectronic/p5/a68944 A68944 Thu, 20 Apr 2023 07:00:00 GMT
Cuprous Iodide Film Shows Promise for Semiconductors, Optoelectronics
Physicists from RIKEN have taken a step to enhance semiconductor performance, developing a single-crystal thin film of cuprous iodide. The film is atomically flat and free of any defects.

Conventional approaches for fabricating thin films of cuprous iodide without any impurities typically necessitate depositing the film from a solution. Using cuprous iodide, however, which is a halide compound and a highly effective conductor and is stable above room temperature, a solution-based process is unable to generate a high-quality thin film.

A team led Masao Nakamura from the RIKEN Center for Emergent Matter Science instead used molecular beam epitaxy. In the technique, a film is grown on top of a substrate, in a vacuum, and at an...]]>
https://www.photonics.com/Articles/Cuprous_Iodide_Film_Shows_Promise_for/p5/a66880 A66880 Fri, 09 Apr 2021 07:00:00 GMT
Study Investigates Ways to Achieve Invisibility Without Using Metamaterials
Researchers at Tokyo Institute of Technology (Tokyo Tech) have discovered a way to make a submicron-size cylinder disappear without using any specialized coating. Their findings could enable invisibility of natural materials at optical frequency and eventually lead to a simpler way of enhancing optoelectronic devices, including sensing and communication technologies.

Making objects invisible is no longer a fantasy but a fast-evolving science. “Invisibility cloaks” using metamaterials — engineered materials that can bend rays of light around an object to make it undetectable — now exist and are beginning to be used to improve the performance of satellite antennas and sensors. Many of the proposed metamaterials,...]]>
https://www.photonics.com/Articles/Study_Investigates_Ways_to_Achieve_Invisibility/p5/a64643 A64643 Tue, 23 Apr 2019 08:00:00 GMT
New Approach Contains Light, Protects It from Defects
Researchers have found a way to confine light so that it is insensitive to imperfections in the material that confines it. The new approach is based on “topological protection,” a concept used extensively in solid-state electronic physics. It could help lower the cost while improving the speed of photonic devices.

Using a waveguide lattice structure, a team of researchers from Penn State, the University of Pittsburgh, and the University of Illinois was able to protect the mode frequency at midgap and minimize the volume of a photonic defect mode. Light entered at one end of the waveguide array and was trapped and confined as it propagated through the waveguides. The trapped light became immune to imperfections in the...]]>
https://www.photonics.com/Articles/New_Approach_Contains_Light_Protects_It_from/p5/a63534 A63534 Mon, 11 Jun 2018 15:55:47 GMT
AR-coated Ultrathin Film Offers Efficiency, Flexibility
Transparent conductors are found in many devices such as displays, light emitting diodes, photovoltaic cells, and smart phones. Most of this current technology is based on the use of the semiconductor Indium Tin Oxide (ITO) as a transparent conducting material. However, ITO is expensive to produce, lacks flexibility and must be processed under high temperatures.

A flexible transparent conductor is shown. Courtesy of ICFO.
Much research has been devoted to finding an alternative process and alternative materials to replace ITO. Researchers at the Institute of Photonic Sciences (ICFO) and its Catalan Institute of Research and Advanced Studies (ICREA) think they may have found the answer in ultrathin metal films (UTMFs) coated in...]]>
https://www.photonics.com/Articles/AR-coated_Ultrathin_Film_Offers_Efficiency/p5/a61478 A61478 Wed, 21 Dec 2016 14:11:54 GMT
VI Systems Awarded VCSEL Patent
VI Systems GmbH has been awarded a U.S. patent for its vertical-cavity surface-emitting laser (VCSEL).

Courtesy of VI Systems GmbH .
The patent (U.S. No. 20130092896 A1) covers optoelectronic devices, including the company’s ultrahigh-speed 40-Gb/s, 850-nm laser. The invention pertains to semiconductor light-emitting devices for visible and IR spectral ranges. It can also be applied to LEDs targeting the bright red, orange, yellow or green spectral ranges.]]>
https://www.photonics.com/Articles/VI_Systems_Awarded_VCSEL_Patent/p5/a56988 A56988 Fri, 12 Dec 2014 00:00:00 GMT
Red-light-emitting carbon nanotubes could brighten OLEDs
Inducing carbon nanotubes to emit light is difficult, as they are excellent electrical conductors and capture energy from luminescent chemical species placed nearby. Good charge conductivity combined with high luminescent properties could make these red-emitting nanotubes attractive to organic LED-based technologies.

Scientists at the Institute of Physical Chemistry of the Polish Academy of Sciences contributed to the development of the new photonic material as part of the international Finelumen project.

“We take part in the project as a research group specializing in studies on lanthanide...]]>
https://www.photonics.com/Articles/Red-light-emitting_carbon_nanotubes_could/p5/a48814 A48814 Sat, 01 Oct 2011 00:00:00 GMT
Throwing Light a Curve in Real Time
A new technique that dynamically controls plasmonic Airy beams over metallic surfaces is paving the way for fast, ultracompact communication systems and optoelectronic devices.

When Airy beams — which travel without diffraction in a curved arc in free space — are coupled with surface plasmon polaritons (SPP), researchers have found that they can manipulate light at an extremely small scale beyond the diffraction limit.

Examples of the dynamic control of the plasmonic Airy beams show switching the trajectories to various directions (a,b) and bypassing obstacles (gray solid circle in c). Left panels are numerical simulations, right panels are experimental demonstrations. (Image: Xiang Zhang group)
By directing a...]]>
https://www.photonics.com/Articles/Throwing_Light_a_Curve_in_Real_Time/p5/a48051 A48051 Tue, 16 Aug 2011 00:00:00 GMT
Laser Induces Conduction in Graphene
By illuminating graphene with a mid-infrared laser, researchers now can open an observable bandgap in the otherwise gapless material, enabling it to become a semiconductor.

Graphene is the thinnest and strongest material ever discovered. It is a layer of carbon atoms only 1 atom thick, but 200 times stronger than steel. It also conducts electricity extremely well and heat better than any other known material. It is almost completely transparent, yet so dense that not even atoms of helium can penetrate it. Despite the impressive list of promising prospects, however, graphene appears to lack a critical property: a "bandgap."

Graphene is illuminated by a laser field. (Image: Luis E.F. Foa Torres)
A bandgap is the basic property...]]>
https://www.photonics.com/Articles/Laser_Induces_Conduction_in_Graphene/p5/a47452 A47452 Mon, 20 Jun 2011 00:00:00 GMT
Materials Mystery in VO2 Cracked
Scientists have known that vanadium dioxide exhibits several competing phases when it acts as an insulator at lower temperatures. However, the exact nature of the phase behavior has not been understood since research began on vanadium dioxide in the early 1960s.

Alexander Tselev, a research associate from the University of Tennessee-Knoxville working with ORNL's Center for Nanophase Materials Sciences (CNMS), in collaboration with Igor Luk'yanchuk from the University of Picardy in France used a condensed matter physics...]]>
https://www.photonics.com/Articles/Materials_Mystery_in_VO2_Cracked_/p5/a45191 A45191 Thu, 09 Dec 2010 00:00:00 GMT
Pollution-Controlling Gold Nanoparticles
Using silver chloride nanowires decorated with gold nanoparticles, a scientist at the US Department of Energy’s (DoE) Argonne National Laboratory has created visible-light catalysis that may decompose organic molecules in polluted water.

The gold-coated silver chloride nanowires at the microscopic level.
“Silver nanowires have been extensively studied and used for a variety of applications, including transparent conductive electrodes for solar cells and optoelectronic devices,” said nanoscientist Yugang Sun of Argonne’s Center for Nanoscale Materials. “By chemically converting them into semiconducting silver chloride nanowires, followed by adding gold nanoparticles, we have created nanowires with a...]]>
https://www.photonics.com/Articles/Pollution-Controlling_Gold_Nanoparticles_/p5/a42539 A42539 Wed, 16 Jun 2010 00:00:00 GMT
Student Awards at OFC/NFOEC Corning and the OSA Foundation will announce the winner of the Corning Outstanding Student Paper Competition, and Infinera and OSA will announce the Infinera Outstanding Student Recognition prize.
The seven finalists competing for the Corning award were selected from a record 425 student paper submissions. During this year’s show, the finalists will present their research and will be judged by the conference general chairs and program chairs based on innovation, research excellence and author presentation skills.
The grand-prize...]]>
https://www.photonics.com/Articles/Student_Awards_at_OFC_NFOEC/p5/a36840 A36840 Tue, 24 Mar 2009 00:00:00 GMT
Students Awarded at Show Corning and the Optical Society of America (OSA) Foundation will announce the winner of the Corning Outstanding Student Paper Competition, and Infinera and OSA will announce the Infinera Outstanding Student Recognition prize.
The seven finalists competing for the Corning competition were selected from a record 425 student paper submissions. During this year’s show, the finalists will present their research and will be judged by the conference general chairs and program chairs based on innovation, research excellence and author presentation...]]>
https://www.photonics.com/Articles/Students_Awarded_at_Show/p5/a36841 A36841 Tue, 24 Mar 2009 00:00:00 GMT
New Business Unit https://www.photonics.com/Articles/New_Business_Unit/p5/a35955 A35955 Mon, 01 Dec 2008 00:00:00 GMT UV LED Created with Nanorod Heterostructures
Vertically aligned nanorod arrays that exhibit strong near-ultraviolet emission have been created by researchers seeking to simplify the LED fabrication process.

Sung Jin An and Gyu-Chul Yi of the National CRI Center for Semiconductor Nanorods and Department of Materials Science and Engineering in Pohang, South Korea, report that they have created an LED composed of n-GaN/ZnO vertically aligned nanorod heterostructures grown on p-GaN substrates.


This schematic illustrates a GaN/ZnO coaxial nanorod heterostructure on a p-GaN substrate (left).The field-emission-gun scanning electron microscopy image shows the nanorod heterostructures (right). The inset shows a high-resolution transmission electron microscopy image of the nanorod...]]>
https://www.photonics.com/Articles/UV_LED_Created_with_Nanorod_Heterostructures/p5/a31681 A31681 Sat, 01 Dec 2007 00:00:00 GMT
POLYMERS AND LIGHT
Reflecting the multidisciplinary nature of the field, the 396-page book Polymers and Light: Fundamentals and Technical Applications is designed to serve as a textbook for students and as a resource for polymer, physical and organic chemists, manufacturers of optoelectronic devices, chemical engineers and materials scientists. A section on the absorption of light and photophysical processes discusses luminescence, optical absorption, and time-resolved, IR and UV/VIS spectroscopy. Photoreactions in DNA, cellulose, and lignins and wood are described as well as technical developments in the areas of polymers as chemical sensors, turn-off fluorescence detection, and image and optical fiber sensors. Charts, diagrams, references and a subject...]]>
https://www.photonics.com/Articles/POLYMERS_AND_LIGHT/p5/a31354 A31354 Thu, 01 Nov 2007 00:00:00 GMT
Femtosecond Laser Promotes Rapid, Localized Nanowire Growth
Optoelectronic devices, including blue laser diodes, LEDs and photodetectors, rely on the wide bandgap (2.8 eV) of semiconductor ZnSe nanowires. Because the fundamental optical and electronic properties of these nanowires depend on size, several growth techniques exist to generate them with controlled dimensions.

A team of researchers from the University of Tokyo, from Zhongshan University in Guangzhou, China, and from the Chinese Academy of Sciences in Shanghai have applied pulsed laser deposition to grow ZnSe nanowires on crystal surfaces. Using a Spectra-Physics Ti:sapphire regenerative amplifier, they irradiated crystals with 130-fs, 800-nm pulses to ablate the surface of the crystal and produce craters.

The scientists discovered...]]>
https://www.photonics.com/Articles/Femtosecond_Laser_Promotes_Rapid_Localized/p5/a27224 A27224 Wed, 01 Nov 2006 00:00:00 GMT
Bright LEDs Made on Side Facets of GaN Stripes
LEDs are fabricated by growing epitaxial layers along the direction of the crystal polar axis. However, the optical efficiency of these optoelectronic devices decreases with increasing wavelength, due in part to strong internal piezoelectric fields of GaInN quantum wells. Separation of electrons and holes within the wells reduces the probability of radiation recombination. Reducing the piezoelectric fields can overcome this effect, making more efficient luminescence possible.


The frontal view of a triangular GaN stripe, imaged with a Zeiss scanning electron microscope, demonstrates the bright blue light emitted by the LED structure.

A solution may be realized by beginning epitaxial growth in the c direction, then using selective...]]>
https://www.photonics.com/Articles/Bright_LEDs_Made_on_Side_Facets_of_GaN_Stripes/p5/a26594 A26594 Fri, 01 Sep 2006 00:00:00 GMT
Solution-Cast Semiconductor Outperforms Conventional Chips
The investigators created photoconductive detectors by spin-coating quantum dots from a solution onto gold-interwoven electrodes. Processed from a chloroform solution, the quantum dot nanocrystals enabled easy...]]>
https://www.photonics.com/Articles/Solution-Cast_Semiconductor_Outperforms/p5/a26279 A26279 Tue, 01 Aug 2006 00:00:00 GMT