SPIE NanoScience + Engineering最新文献_第4页

Large-area lithography-free perfect absorbers, color filters, and photodetectors at visible frequencies using ultra-thin silver or amorphous silicon films (Presentation Recording) 使用超薄银或非晶硅薄膜的大面积无光刻完美吸收器，彩色滤光片和可见光频率的光电探测器(演示记录)

SPIE NanoScience + Engineering Pub Date : 2015-10-05 DOI: 10.1117/12.2187139

Zhongyang Li, S. Butun, Koray Aydin

{"title":"Large-area lithography-free perfect absorbers, color filters, and photodetectors at visible frequencies using ultra-thin silver or amorphous silicon films (Presentation Recording)","authors":"Zhongyang Li, S. Butun, Koray Aydin","doi":"10.1117/12.2187139","DOIUrl":"https://doi.org/10.1117/12.2187139","url":null,"abstract":"Plasmonic materials and metamaterials have been widely utilized to achieve spectral transmission, reflection and absorption filters based on localized or delocalized resonances arising from the interaction of photons with nanoscale patterns. However, the realization of visible-frequency, high-performance, large-area, optical filters based on nanoplasmonic materials is rather challenging due to nanofabrication related problems (cost, fabrication imperfection, surface roughness) and optical losses of metals. Here, we propose and demonstrate large-area perfect absorbers and transmission color filters and photodectors that could overcome the difficulties associated with nanofabrication using a lithography-free approach. Our resonant flat optical design is based on a modified, asymmetric metal-insulator/semiconductor-metal (MI/SM) based Fabry-Perot cavity incorporated with plasmonic, lossy ultra-thin (~ 30 nm) Ag or (~ 5-15 nm) amorphous Si films. We demonstrated a narrow bandwidth (~17 nm) super absorber with 97% maximum absorption with a performance comparable to nanostructure/nanoparticle-based super absorbers. We also investigated transmission filters in which different colors can be obtained by controlling the spacer thickness of silicon dioxide or amorphous silicon. With measured performance of transmission peak intensity reaching 60% and a narrow-band of ~ 40 nm, our color filters exceed the performance of widely studied plasmonic nanohole array based color filters and make a good candidate for large-area narrow-band photodetection devices. Such plasmonic loss incorporated Fabry-Perot cavities using ultra-thin metallic or semiconductor films could suggest active and practical applications in spectrally selective optical (color and absorber) filters, optoelectronic devices with controlled bandwidth such as narrow-band photodetectors, and light-emitting devices.","PeriodicalId":432358,"journal":{"name":"SPIE NanoScience + Engineering","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128689827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multicolor fluorescence microscopic imaging of cancer cells on the plasmonic chip (Presentation Recording) 等离子体芯片上癌细胞的多色荧光显微成像(演示录音)

SPIE NanoScience + Engineering Pub Date : 2015-10-05 DOI: 10.1117/12.2186276

K. Tawa, Chisato Sasakawa, Shohei Yamamura, Izumi Shibata, M. Kataoka

引用次数: 0

Photo-induced electron transfer processes in doped conjugated polymer films (Presentation Recording) 掺杂共轭聚合物薄膜的光诱导电子转移过程(报告记录)

SPIE NanoScience + Engineering Pub Date : 2015-10-05 DOI: 10.1117/12.2187688

G. Rumbles, O. Reid, Jaehong Park, Jessica Ramirez, H. Marsh, Tyler T. Clikeman

引用次数: 0

Laser processing of metamaterial structures (Presentation Recording) 超材料结构的激光加工(演讲录音)

SPIE NanoScience + Engineering Pub Date : 2015-10-05 DOI: 10.1117/12.2191645

A. Piqué, N. Charipar, Heungsoo Kim, E. Breckenfeld, S. Mathews

引用次数: 0

Nano-photonic phenomena in van der Waals heterostructures (Presentation Recording) 范德华异质结构中的纳米光子现象(报告记录)

SPIE NanoScience + Engineering Pub Date : 2015-10-05 DOI: 10.1117/12.2189749

D. Basov

引用次数: 0

Properties of infrared doped semiconductor Mie resonators (Presentation Recording) 红外掺杂半导体Mie谐振器的特性(演示记录)

SPIE NanoScience + Engineering Pub Date : 2015-10-05 DOI: 10.1117/12.2187292

T. Lewi, P. Iyer, N. Butakov, J. Schuller

{"title":"Properties of infrared doped semiconductor Mie resonators (Presentation Recording)","authors":"T. Lewi, P. Iyer, N. Butakov, J. Schuller","doi":"10.1117/12.2187292","DOIUrl":"https://doi.org/10.1117/12.2187292","url":null,"abstract":"Dielectric optical antenna resonators have recently emerged as a viable alternative to plasmonic resonators for metamaterials and nanophotonic devices, due to their ability to support multipolar Mie resonances with low losses. In this work, we experimentally investigate the mid-infrared Mie resonances in Si and Ge subwavelength spherical particles. In particular, we leverage the electronic and optical properties of these semiconductors in the mid-infrared range to design and tune Mie resonators through free-carrier refraction. Si and Ge semiconductor spheres of varying sizes of 0.5-4 μm were fabricated using femtosecond laser ablation. Using single particle infrared spectroscopy, we first demonstrate size-dependent Si and Ge Mie resonances spanning the entire mid-infrared (2-16 μm) spectral range. Subsequently we show that the Mie resonances can be tuned by varying material properties rather than size or geometry. We experimentally demonstrate doping-dependent resonance frequency shifts that follow simple Drude models of free-carrier refraction. We show that Ge particles exhibit a stronger doping dependence than Si due to the smaller effective mass of the free carriers. Using the unique size and doping dispersion of the electric and magnetic dipole modes, we identify and demonstrate a size regime where these modes are spectrally overlapping. We also demonstrate the emergence of plasmonic resonances for high doping levels and long wavelengths. These findings demonstrate the potential for tuning infrared semiconductor Mie resonances by optically or electrically modulating charge carrier densities, thus providing an excellent platform for tunable electromagnetic metamaterials.","PeriodicalId":432358,"journal":{"name":"SPIE NanoScience + Engineering","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121956973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optical and structural properties of co-sputtered Cu-Si-O and Cu-Ge-O thin films (Presentation Recording) Cu-Si-O和Cu-Ge-O共溅射薄膜的光学和结构特性(呈现记录)

SPIE NanoScience + Engineering Pub Date : 2015-10-05 DOI: 10.1117/12.2188902

Lirong Sun, N. Murphy, John G. Jones, J. Grant

{"title":"Optical and structural properties of co-sputtered Cu-Si-O and Cu-Ge-O thin films (Presentation Recording)","authors":"Lirong Sun, N. Murphy, John G. Jones, J. Grant","doi":"10.1117/12.2188902","DOIUrl":"https://doi.org/10.1117/12.2188902","url":null,"abstract":"The co-sputtered Cu-Si-O and Cu-Ge-O thin films were prepared using reactive DC, pulse DC and modulated pulse power magnetron sputtering (MPPMS) on two separate Cu and Si or Cu and Ge targets simultaneously. The powers on each target and Oxygen/Argon flow ratio f(O2) were varied to have different stoichiometies determined by XPS. The film thickness, refractive index n and extinction coefficient k were extracted from in situ ellipsometry and the reactive plasma discharge was monitored by optical emission spectroscopy in real time during film growth. The grazing incident x-ray diffraction measurements reveal that the films deposited at low f(O2) have the nanocrystalline structure of cuprous Cu2O with diffraction peaks of (111) and (200). The films deposited at high f(O2) (≥ 1) have cupric oxide CuO phase. The optical constant n and k, film density and band gap of the co-sputtered film were investigated and determined by in situ ellipsometry, X-ray reflectivity and UV-Vis-NIR spectroscopy. Their structural, chemical and optical properties are able to be tuned by incorporating Cu2O, CuO and the mixtures of them into Silicon oxide or Germanium oxide matrix with varying target powers and oxygen/Argon ratio for applications in optical coatings and optical filters.","PeriodicalId":432358,"journal":{"name":"SPIE NanoScience + Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122035967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gain-enhanced hyperbolic metamaterials at telecommunication frequencies (Presentation Recording) 电信频率增益增强双曲超材料(演示记录)

SPIE NanoScience + Engineering Pub Date : 2015-10-05 DOI: 10.1117/12.2187266

J. Smalley, F. Vallini, B. Kanté, Shiva Shahin, C. Riley, Y. Fainman

{"title":"Gain-enhanced hyperbolic metamaterials at telecommunication frequencies (Presentation Recording)","authors":"J. Smalley, F. Vallini, B. Kanté, Shiva Shahin, C. Riley, Y. Fainman","doi":"10.1117/12.2187266","DOIUrl":"https://doi.org/10.1117/12.2187266","url":null,"abstract":"Using effective medium theory (EMT), Bloch’s theorem (BT), and the transfer matrix method (TMM), we analyze the possibility of gain-enhanced transmission in metamaterials with hyperbolic dispersion at telecommunication frequencies. We compare different combinations of dissipative metals and active dielectrics, including noble metals, transparent conducting oxides (TCO), III-V compounds, and solid-state dopants. We find that both indium gallium arsenide phosphide (InGaAsP) and erbium-doped silica (Er:SiO2), when combined with silver, show promise as a platform for demonstration of pump-dependent transmission. On the other hand, when these active dielectrics are combined with aluminum-doped zinc oxide (AZO), a low-loss TCO, gain-enhanced transmission is negligible. Results based on EMT are compared to the more accurate BT and TMM. When losses are ignored, quantitative agreement between these analytical techniques is observed near the center of the first Brillouin zone of a one-dimensional periodic structure. Including realistic levels of loss and gain, however, EMT predictions become overly optimistic compared to BT and TMM. We also discuss the limitations to assumptions inherent to EMT, BT, and TMM, and suggest avenues for future analysis.","PeriodicalId":432358,"journal":{"name":"SPIE NanoScience + Engineering","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123991499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pulsed laser annealing for advanced performance of mechanically flexible and optically transparent multilayer MoS2 transistors (Presentation Recording) 机械柔性、光学透明多层MoS2晶体管的脉冲激光退火技术(演示记录)

SPIE NanoScience + Engineering Pub Date : 2015-10-05 DOI: 10.1117/12.2192024

Hyuk‐Jun Kwon, Woong Choi, M. Oh, Sunkook Kim, C. Grigoropoulos

{"title":"Pulsed laser annealing for advanced performance of mechanically flexible and optically transparent multilayer MoS2 transistors (Presentation Recording)","authors":"Hyuk‐Jun Kwon, Woong Choi, M. Oh, Sunkook Kim, C. Grigoropoulos","doi":"10.1117/12.2192024","DOIUrl":"https://doi.org/10.1117/12.2192024","url":null,"abstract":"Laser enables the achievement of superb interfacial characteristics between electrode and semiconducting material contact surface and is also useful for a reduction in contact resistance. The irradiation of a pulsed laser with high energy density and short wavelength onto the electrodes leads to thermal annealing at the locally confined small area that needs high temperature without inflicting thermal damage. This contrasts conventional thermal annealing that affects the entire panel, including unwanted areas in which the annealing process should be excluded. We demonstrate that mechanically flexible and optically transparent (more than 81% transmittance in visible wavelength) multilayered molybdenum disulfide (MoS2) thin-film transistors (TFTs) in which the source/drain electrodes are selectively annealed using picosecond laser achieve the enhancement of device performance without plastic deformation, such as higher mobility, increased output resistance, and decreased subthreshold swing. Numerical thermal simulation for the temperature distribution, transmission electron microscopy (TEM) analysis, current-voltage measurements, and contact-free mobility extracted from the Y-function method (YFM) enable understanding of the compatibility and the effects of pulsed laser annealing process; the enhanced performance originated not only from a decrease in the Schottky barrier effect at the contact, but also an improvement of the channel interface. Furthermore, these results show that the laser annealing can be a promising technology to build up a high performance transparent and flexible electronics.","PeriodicalId":432358,"journal":{"name":"SPIE NanoScience + Engineering","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128585383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced infrared transmission from gold wire-grid arrays via surface plasmons in continuous graphene (Presentation Recording) 通过连续石墨烯表面等离子体增强金线栅阵列的红外传输(演示记录)

SPIE NanoScience + Engineering Pub Date : 2015-10-05 DOI: 10.1117/12.2186872

Zizhuo Liu, Serkan Bütün, E. Palacios, Koray Aydin

{"title":"Enhanced infrared transmission from gold wire-grid arrays via surface plasmons in continuous graphene (Presentation Recording)","authors":"Zizhuo Liu, Serkan Bütün, E. Palacios, Koray Aydin","doi":"10.1117/12.2186872","DOIUrl":"https://doi.org/10.1117/12.2186872","url":null,"abstract":"Enhanced transmission of light through nanostructures has always been of great interest in the field of plasmonics and nanophotonics. With the aid of near-field effects, the transmission of the electromagnetic waves can be enhanced or suppressed. Much of the work on enhanced transmission has been shown to be frequency-selective. However it is possible to increase the transmission over a large frequency range by using graphene, which has shown broadband properties in many applications. Here, we propose enhanced transmission in wire grid gold structure making use of continuous graphene sheets. We use finite-difference time-domain simulations to study the optical properties of this graphene-metal hybrid structure at mid infrared (mid-IR) wavelengths. The grating structure in wire grid gold provides an ideal platform to match the momentum and excite the surface plasmon polaritons (SPPs) in monolayer graphene. Our numerical calculations show that the local electromagnetic field around the graphene is largely enhanced due to surface plasmons. Moreover, with the highly confined SPPs coupling with the incident light, the transmission through the whole structure can be broadly enhanced in the mid infrared region. We also analyze the effect of the spectrum with different periods and gold nanowire widths to evaluate the size effects of the plasmons in graphene. In addition, by tuning the Fermi level, one can control the wavelength range at which the transmission is enhanced. The mechanism of the enhancement will be explained in the calculated electric field distribution. And we will also highlight the opportunities of graphene for applications such as tunable transmission and active photonic modulator.","PeriodicalId":432358,"journal":{"name":"SPIE NanoScience + Engineering","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127320641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0