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Semiconductor plasmonic

Jan M Winkler, Freddy T Rabouw, Aurelio Rossinelli, Sriharsha Jayanti, Kevin M McPeak, David K Kim, Boris le Feber, Ferry Prins, David J Norris
Exciton polaritons are hybrid light-matter quasiparticles that can serve as coherent light sources. Motivated by applications, room-temperature realization of polaritons requires narrow excitonic transitions with large transition dipoles. Such transitions must then be strongly coupled to an electromagnetic mode confined in a small volume. While much work has explored polaritons in organic materials, semiconductor nanocrystals present an alternative excitonic system with enhanced photostability and spectral tunability...
December 5, 2018: Nano Letters
Choloong Hahn, Maude Amyot-Bourgeois, Maryam Al-Shehab, Howard Northfield, Youngsun Choi, Seok Ho Song, R Niall Tait, Pierre Berini
In last few decades, micro- and nano-fabrication techniques based on photolithography and electron beam lithography have advanced greatly, mainly in the field of semiconductor fabrication. Such techniques are generally transferrable to the fabrication of plasmonic structures and metamaterials. However, plasmonic devices often require a transparent insulating substrate to be operational at visible or near-infrared wavelengths. Here we report a resist-on-metal bilayer lift-off technique enabling the fabrication of plasmonic structures on insulating substrates...
December 4, 2018: Nanotechnology
Laura Collado, Anna Reynal, Fernando Fresno, Mariam Barawi, Carlos Escudero, Virginia Perez-Dieste, Juan M Coronado, David P Serrano, James R Durrant, Víctor A de la Peña O'Shea
Sunlight plays a critical role in the development of emerging sustainable energy conversion and storage technologies. Light-induced CO2 reduction by artificial photosynthesis is one of the cornerstones to produce renewable fuels and environmentally friendly chemicals. Interface interactions between plasmonic metal nanoparticles and semiconductors exhibit improved photoactivities under a wide range of the solar spectrum. However, the photo-induced charge transfer processes and their influence on photocatalysis with these materials are still under debate, mainly due to the complexity of the involved routes occurring at different timescales...
November 26, 2018: Nature Communications
Mao Ye, Wei Wei, Lihua Zheng, Yuze Liu, Dewei Wu, Xiangyu Gu, Ang Wei
In this paper, we successfully constructed a ternary metal/non-metal nanomaterial which can synergize Z-scheme heterojunction and plasmonic metal/semiconductor for enhancing visible light photoreduction of aqueous Cr(VI). The as-formed ternary metal/non-metal nanomaterial was composed of g-C3 N4 nanosheets mutual modified by Ag nanoparticles and Bi4 O7 . In the ternary nanomaterial, g-C3 N4 nanosheets and Bi4 O7 fabricated Z-scheme heterojunction, g-C3 N4 nanosheets and Ag nanoparticles formed plasmonic metal/semiconductor system, synchronously...
November 17, 2018: Journal of Hazardous Materials
Weifeng Jiang
A reconfigurable mode (de)multiplexer/switch (RMDS) is a pivotal component for the mode routing in mode-division multiplexing (MDM) networks. Here, we propose a three-dimensional (3D) RMDS via a triple-waveguide directional coupler, consisting of a lower doped silicon waveguide, a central plasmonic horizontal-slot waveguide with indium-tin-oxide (ITO) and an upper doped polycrystalline-silicon waveguide. The enhanced light-matter-interactions can be achieved via the central plasmonic metal-oxide-semiconductor (MOS) mode...
October 1, 2018: Optics Express
Swarup Kumar Maji, Subin Yu, Kyungwha Chung, Madeshwaran Sekkarapatti Ramasamy, Ju Won Lim, Jianfang Wang, Hyukjin Lee, Dong Ha Kim
In recent years, the concept of combined therapy using gold hybrid nanomaterials has been broadly adopted to pioneer new anticancer treatments. However, their synergistic anticancer effects have yet to be thoroughly investigated. Herein, a hybrid gold nanobipyramid nanostructure coated with molybdenum disulfide (MoS2 ) semiconductor (AuNBPs@MoS2 ) was proposed as a smart nanozyme for anticancer therapy and two-photon bioimaging. The hybrid material showed dramatically enhanced localized surface plasmon resonance (LSPR) property under excitation owing to its anisotropic nature, coupled with the rich electron density in MoS2, resulting in the superior in situ photo-generation of reactive oxidative species (ROS - 1 O2 , ˙OH)...
November 21, 2018: ACS Applied Materials & Interfaces
Lingyu Hong, Hao Li, Haw Yang, Kaushik Sengupta
The ultra-miniaturization of massively multiplexed fluorescence-based bio-molecular sensing systems for proteins and nucleic acids into a chip-scale form, small enough to fit inside a pill (∼ 0.1cm3 ), can revolutionize sensing modalities in-vitro and in-vivo. Prior miniaturization techniques have been limited to focusing on traditional optical components (multiple filter sets, lenses, photo-detectors, etc.) arranged in new packaging systems. Here, we report a method that eliminates all external optics and miniaturizes an entire multiplexed fluorescence system into a 2 × 1 mm2 chip through co-integration for the first time of massively scalable nano-plasmonic multi-functional optical elements and electronic processing circuitry realized in an industry standard complementary-metal-oxide semiconductor (CMOS) foundry process with absolutely 'no change' in fabrication or processing...
November 1, 2018: Biomedical Optics Express
Ning Liu, Christophe Silien, Greg Sun, Brian Corbett
The dielectric-semiconductor-dielectric-metal 4 layered structure is a well-established configuration to support TM hybrid plasmonic modes, which have demonstrated significant advantages over pure photonic modes in structures without metal to achieve low loss resonant cavities at sub-diffraction limited volumes. The photonic modes with TE characteristics supported by the same 4 layered structure, on the other hand, are less studied. Here we show that a low loss photonic mode with TE01 characteristics exists in the dielectric-semiconductor-dielectric-metal 4 layered structure if a truncated cylindrical disk is chosen as the semiconductor core...
November 19, 2018: Scientific Reports
Alasdair H Fikouras, Marcel Schubert, Markus Karl, Jothi D Kumar, Simon J Powis, Andrea Di Falco, Malte C Gather
Molecular dyes, plasmonic nanoparticles and colloidal quantum dots are widely used in biomedical optics. Their operation is usually governed by spontaneous processes, which results in broad spectral features and limited signal-to-noise ratio, thus restricting opportunities for spectral multiplexing and sensing. Lasers provide the ultimate spectral definition and background suppression, and their integration with cells has recently been demonstrated. However, laser size and threshold remain problematic. Here, we report on the design, high-throughput fabrication and intracellular integration of semiconductor nanodisk lasers...
November 16, 2018: Nature Communications
Jong Uk Kim, Sori Lee, Seung Ji Kang, Tae-Il Kim
Light-to-heat conversion systems have been attracting growing research interest in the last few decades, due to their highly intriguing photothermal properties and their wide applications ranging from biomedical applications to solar energy harvesting to mechanical actuators. In general, because the light-to-heat conversion efficiency depends strongly on the absorbing material, significant efforts have been focused on fabricating broadband light absorbers. However, there are several challenges associated with the design and fabrication of light absorbers, such as minimizing heat loss, and optimizing the broadband light absorption and omnidirectional light absorption...
November 29, 2018: Nanoscale
Masiar Sistani, Minh Anh Luong, Martien Ilse Den Hertog, Eric Robin, Maria Spies, Bruno Fernandez, Jun Yao, Emmerich Bertagnolli, Alois Lugstein
The electrical and optical properties of low dimensional nanostructures depend critically on size and geometry and may differ distinctly from those of their bulk counterparts. In particular, ultra-thin semiconducting layers as well as nanowires have already proven the feasibility to realize and study quantum size effects enabling novel ultra-scaled devices. Further, plasmonic metal nanostructures attracted recently a lot of attention because of appealing near-field mediated enhancement effects. Thus, combining metal and semiconducting constituents in quasi 1D heterostructures will pave the way for ultra-scaled systems and high-performance devices with exceptional electrical, optical and plasmonic functionality...
November 14, 2018: Nano Letters
Alexander G Milekhin, Sergei A Kuznetsov, Ilya A Milekhin, Larisa L Sveshnikova, Tatyana A Duda, Ekaterina E Rodyakina, Alexander V Latyshev, Volodymyr M Dzhagan, Dietrich R T Zahn
We report a study of the infrared response by localized surface plasmon resonance (LSPR) modes in gold micro- and nanoantenna arrays with various morphologies and surface-enhanced infrared absorption (SEIRA) by optical phonons of semiconductor nanocrystals (NCs) deposited on the arrays. The arrays of nano- and microantennas fabricated with nano- and photolithography reveal infrared-active LSPR modes of energy ranging from the mid to far-infrared that allow the IR response from very low concentrations of organic and inorganic materials deposited onto the arrays to be analyzed...
2018: Beilstein Journal of Nanotechnology
Bin Yao, Jing Zhang, Xiaoli Fan, Jianping He, Yat Li
Photo-electrochemical water splitting represents a green and environmentally friendly method for producing solar hydrogen. Semiconductor nanomaterials with a highly accessible surface area, reduced charge migration distance, and tunable optical and electronic property are regarded as promising electrode materials to carry out this solar-to-hydrogen process. Since most of the photo-electrochemical reactions take place on the electrode surface or near-surface region, rational engineering of the surface structures, physical properties, and chemical nature of photoelectrode materials could fundamentally change their performance...
November 8, 2018: Small
Xinyuan You, S Ramakrishna, Tamar Seideman
Plasmons in metal nanoparticles (MNPs) promise to enhance solar energy conversion in semiconductors. Two essential mechanisms of enhancement in the near-field regime are hot electron injection (HEI) and plasmon-induced resonance energy transfer (PIRET). Individual studies of both mechanisms indicate that the PIRET efficiency is limited by the short lifetime of the plasmon, whereas the hot electrons result from the plasmon decay. The development of a unified theory of the coupled HEI and PIRET processes is fundamentally interesting and necessary for making reliable predictions but is complicated by the multiple interactions between various components that participate in the enhancement process...
November 7, 2018: Journal of Chemical Physics
Fang Xu, Ho-Pui Ho
Conductometric gas sensors facilitated by photons have been investigated for decades. Light illumination may enhance device attributes including operational temperature, sensing sensitivity and selectivity. This paper aims to provide an overview on the progress of light-activated gas sensors, with a specific focus on sensors based on metal oxides. The material systems that have been studied include pure metal oxides, heterostructures of semiconductor-metal oxides and metal-metal oxides, and metal oxides with dopant...
November 18, 2017: Micromachines
Amit Kumar, Anamika Rana, Gaurav Sharma, Mu Naushad, Ala'a H Al-Muhtaseb, Changsheng Guo, Ana Iglesias-Juez, Florian J Stadler
Highly photoresponsive semiconductor photocatalysis for energy and environmental applications require judicious choice and optimization of semiconductor interfaces for wide spectral capabilities. This work aims at rational designing of highly active SrTiO3 /g-C3 N4 junctions bridged with Ag/Fe3 O4 nanoparticles for utilizing Z-scheme transfer and surface plasmon resonance effect of Ag augmented by iron oxide. The SrTiO3 /(Ag/Fe3 O4 )/g-C3 N4 (SFC) catalyst was employed for photocatalytic hydrogen production and photodegradation of levofloxacin (LFC; 20 mg/L) under UV, visible, near infra-red, and natural solar light exhibiting high performance...
November 28, 2018: ACS Applied Materials & Interfaces
Amit Kumar, Sunil Kumar Sharma, Gaurav Sharma, Ala'a H Al-Muhtaseb, Mu Naushad, Ayman A Ghfar, Florian J Stadler
Metallic Ag deposited BiPO4 /BiOBr/BiFeO3 ternary nano-hetero-structures were rationally designed and synthesized by a simple precipitation-wet impregnation-photo deposition method. The plasmonic junction possesses an excellent wide spectrum photo-response and makes best use of BiPO4 which is otherwise a poor photocatalyst. Ag@BiPO4 /BiOBr/BiFeO3 showed superior photocatalytic activity for degradation of norfloxacin (NFN) under visible, ultra-violet, near-infra-red and natural solar light. Especially catalyst APBF-3 (0...
October 22, 2018: Journal of Hazardous Materials
Yue Luo, Gabriella D Shepard, Jenny V Ardelean, Daniel A Rhodes, Bumho Kim, Katayun Barmak, James C Hone, Stefan Strauf
Solid-state single-quantum emitters are crucial resources for on-chip photonic quantum technologies and require efficient cavity-emitter coupling to realize quantum networks beyond the single-node level1,2 . Monolayer WSe2 , a transition metal dichalcogenide semiconductor, can host randomly located quantum emitters3-6 , while nanobubbles7 as well as lithographically defined arrays of pillars in contact with the transition metal dichalcogenide act as spatially controlled stressors8,9 . The induced strain can then create excitons at defined locations...
October 29, 2018: Nature Nanotechnology
Sandeep Inampudi, Vijaykumar Toutam, Srinivas Tadigadapa
Single and few-layer graphene flakes, while visible on a dielectric surface with customized thickness, cannot be optically imaged when exfoliated directly on semiconductors or metal substrates with arbitrary thickness. In this paper, we show that such graphene flakes become visible through a conventional microscope on a substrate patterned with a submicron sized, hexagonally packed array of gold disks. The interaction of the metal pattern with the incident light generates surface plasmon polaritons (SPPs) and results in enhanced reflectivity for certain angles and wavelengths...
January 4, 2019: Nanotechnology
Zengji Yue, Haoran Ren, Shibiao Wei, Jiao Lin, Min Gu
Complementary metal-oxide-semiconductor (CMOS) technology has provided a highly sensitive detection platform for high-resolution optical imaging, sensing and metrology. Although the detection of optical beams carrying angular momentum have been explored with nanophotonic methods, the metrology of optical angular momentum has been limited to bulk optics. We demonstrate angular-momentum nanometrology through the spatial displacement engineering of plasmonic angular momentum modes in a CMOS-compatible plasmonic topological insulator material...
October 24, 2018: Nature Communications
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