SPIE NanoScience + Engineering最新文献

Sculpting Waves (Presentation Recording) 雕刻波浪(演示录音)

SPIE NanoScience + Engineering Pub Date : 2015-10-21 DOI: 10.1117/12.2223967

N. Engheta

引用次数: 0

Spin-orbit torques in magnetic bilayers (Presentation Recording) 磁双层中的自旋轨道力矩(演示记录)

SPIE NanoScience + Engineering Pub Date : 2015-10-12 DOI: 10.1117/12.2190068

P. Haney, M. Stiles, Hyun-Woo Lee, A. Manchon, Kyung-Jin Lee

{"title":"Spin-orbit torques in magnetic bilayers (Presentation Recording)","authors":"P. Haney, M. Stiles, Hyun-Woo Lee, A. Manchon, Kyung-Jin Lee","doi":"10.1117/12.2190068","DOIUrl":"https://doi.org/10.1117/12.2190068","url":null,"abstract":"Spintronics aims to utilize the coupling between charge transport and magnetic dynamics to develop improved and novel memory and logic devices. Future progress in spintronics may be enabled by exploiting the spin-orbit coupling present at the interface between thin film ferromagnets and heavy metals. In these systems, applying an in-plane electrical current can induce magnetic dynamics in single domain ferromagnets, or can induce rapid motion of domain wall magnetic textures. There are multiple effects responsible for these dynamics. They include spin-orbit torques and a chiral exchange interaction (the Dzyaloshinskii-Moriya interaction) in the ferromagnet. Both effects arise from the combination of ferromagnetism and spin-orbit coupling present at the interface. There is additionally a torque from the spin current flux impinging on the ferromagnet, arising from the spin hall effect in the heavy metal. Using first principles calculations, we identify spin-orbit hybridization at the ferromagnet-heavy metal interface as central to the spin-orbit torques present in Co-Pt bilayers. We additionally propose that the transverse spin current (from the spin hall effect) is locally enhanced over its bulk value due to scattering at an interface which is oriented normal to the charge current direction.","PeriodicalId":432358,"journal":{"name":"SPIE NanoScience + Engineering","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123984728","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

Utilizing homogenous FRET to extend molecular photonic wires beyond 30 nm (Presentation Recording) 利用同质FRET将分子光子线延伸至30 nm以上(演示记录)

SPIE NanoScience + Engineering Pub Date : 2015-10-12 DOI: 10.1117/12.2188169

S. A. Díaz, Susan Buckhout‐White, M. Ancona, J. Melinger, Igor L. Medintz

{"title":"Utilizing homogenous FRET to extend molecular photonic wires beyond 30 nm (Presentation Recording)","authors":"S. A. Díaz, Susan Buckhout‐White, M. Ancona, J. Melinger, Igor L. Medintz","doi":"10.1117/12.2188169","DOIUrl":"https://doi.org/10.1117/12.2188169","url":null,"abstract":"Molecular photonic wires (MPWs) present interesting applications in energy harvesting, artificial photosynthesis, and nano-circuitry. MPWs allow the directed movement of energy at the nanoscopic level. Extending the length of the energy transfer with a minimal loss in efficiency would overcome an important hurdle in allowing MPWs to reach their potential. We investigated Homogenous Förster Resonance Energy Transfer (HomoFRET) as a means to achieve this goal. We designed a simple, self-assembled DNA nanostructure with specifically placed dyes (Alexa488-Cy3-Cy3.5-Alexa647-Cy5.5) at a distance of 3.4 nm, a separation at which energy transfer should theoretically be very high. The input of the wire was at 466 nm with an output up to 697 nm. Different structures were studied where the Cy3.5 section of the MPW was extended from one to six repeats. We found that though the efficiency cost is not null, HomoFRET can be extended up to six repeat dyes with only a 22% efficiency loss when compared to a single step system. The advantage is that these six repeats created a MPW which was 17 nm longer, almost 2.5 times the initial length. To confirm the existence of HomoFRET between the Cy3.5 repeats fluorescence lifetime and fluorescence lifetime anisotropy was measured. Under these conditions we are able to demonstrate the energy transfer over a distance of 30.4 nm, with an end-to-end efficiency of 2.0%, by utilizing a system with only five unique dyes.","PeriodicalId":432358,"journal":{"name":"SPIE NanoScience + Engineering","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129088654","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

Anomalous and planar Righi-Leduc effects measured in ferromagnetic YIG and NiFe (Presentation Recording) 铁磁YIG和NiFe中反常和平面Righi-Leduc效应的测量(报告记录)

SPIE NanoScience + Engineering Pub Date : 2015-10-12 DOI: 10.1117/12.2190101

B. Madon, D. Pham, D. Lacour, A. Anane, R. Bernard, V. Cros, M. Hehn, J. Wegrowe

引用次数: 0

Exploring surface plasmon-polariton resonance (SPR) in an interferometer configuration 在干涉仪结构中探索表面等离子体-极化子共振(SPR)

SPIE NanoScience + Engineering Pub Date : 2015-10-12 DOI: 10.1117/12.2193792

P. Yaney, F. Ouchen, J. Grote

引用次数: 1

Fabrication and characterization of p-ZnO:(P,N)/n-ZnO:Al homojunction ultra-violet (UV) light emitting diodes (Presentation Recording) P - zno:(P,N)/ N - zno:Al均结紫外发光二极管的制备与表征

SPIE NanoScience + Engineering Pub Date : 2015-10-09 DOI: 10.1117/12.2187938

Amiruddin Rafiudeen, T. Reddy, Shaheer Cheemadan, M.C. Santhosh Kumar

{"title":"Fabrication and characterization of p-ZnO:(P,N)/n-ZnO:Al homojunction ultra-violet (UV) light emitting diodes (Presentation Recording)","authors":"Amiruddin Rafiudeen, T. Reddy, Shaheer Cheemadan, M.C. Santhosh Kumar","doi":"10.1117/12.2187938","DOIUrl":"https://doi.org/10.1117/12.2187938","url":null,"abstract":"ZnO possess distinctive characteristics such as low cost, wide band gap (3.36 eV) and large exciton binding energy (60meV). As the band gap lies in ultra violet (UV) region, ZnO is considered as a novel material for the fabrication of ultra violet light emitting diodes (UV-LEDs). However, ZnO being intrinsic n-type semiconductor the key challenge lies in realization of stable and reproducible p-type ZnO. In the present research dual acceptor group-V elements such as P and N are simultaneously doped in ZnO films to obtain the p-type characteristics. The deposition is made by programmable spray pyrolysis technique upon glass substrates at 697K. The optimum doping concentration of P and N were found to be 0.75 at% which exhibits hole concentration of 4.48 x 10^18 cm-3 and resistivity value of 9.6 Ω.cm. The deposited p-ZnO were found to be stable for a period over six months. Highly conducting n-type ZnO films is made by doping aluminum (3 at%) which exhibits higher electron concentration of 1.52 x 10^19 cm-3 with lower electrical resistivity of 3.51 x 10-2 Ω.cm. The structural, morphological, optical and electrical properties of the deposited n-ZnO and p-ZnO thin films are investigated. An efficient p-n homojunction has been fabricated using the optimum p-ZnO:(P,N) and n-ZnO:Al layers. The current–voltage (I–V) characteristics show typical rectifying characteristics of p-n junction with a low turn on voltage. Electroluminescence (EL) studies reveals the fabricated p-n homojunction diodes exhibits strong emission features in ultra-violet (UV) region around 378 nm.","PeriodicalId":432358,"journal":{"name":"SPIE NanoScience + Engineering","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114563710","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

Using radiation intensity dependence on excitation level for the analysis of surface plasmon resonance effect on ZnO luminescence 利用辐射强度与激发能级的关系分析表面等离子体共振对ZnO发光的影响

SPIE NanoScience + Engineering Pub Date : 2015-10-09 DOI: 10.1117/12.2187397

S. Rumyantsev, A. Tarasov, C. Briskina, M. Ryzhkov, V. Markushev, A. Lotin

{"title":"Using radiation intensity dependence on excitation level for the analysis of surface plasmon resonance effect on ZnO luminescence","authors":"S. Rumyantsev, A. Tarasov, C. Briskina, M. Ryzhkov, V. Markushev, A. Lotin","doi":"10.1117/12.2187397","DOIUrl":"https://doi.org/10.1117/12.2187397","url":null,"abstract":"For the analysis of ZnO luminescence the system of rate equations (SRE) was proposed. It contains a set of parameters that characterizes processes participating in luminescence: zone-zone excitation, excitons formation and recombination, formation and disappearance of photons and surface plasmons (SP). It is shown that experimental ZnO microstructure radiation intensity dependence on photoexcitation level can be approximated by using SRE. Thus, the values of these parameters can be estimated and used for luminescence analysis. This approach was applied for the analysis of ZnO microfilms radiation with different thickness of Ag island film covering. It was revealed that the increase of cover thickness leads to the increase of losses and decrease of probability of photons to SP conversion. In order to take into account visible emission, rate equations for levels populations in band-gap and for corresponding photons and SP were added to SRE. By using such SRE it is demonstrated that the form of visible luminescence intensity dependence on excitation level (P) like P1/3, as obtained elsewhere [1], is possible only in case of donor-acceptor pairs existence. The proposed approach was applied for consideration of experimental results obtained in [5-8] taking into account their interpretation of these results based on assumption about transfer of electrons from defect level in ZnO band-gap to metal and then to conduction band in ZnO. Results of performed calculations using modified SRE revealed that effects observed in these papers can exist under only low pumping level. This result will be experimentally checked later.","PeriodicalId":432358,"journal":{"name":"SPIE NanoScience + Engineering","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122614764","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

Determination of refractive index and absorbance modulation amplitudes from angular selectivity of holograms in polymer material with phenanthrenequinone 用角选择性法测定邻苯醌聚合物中全息图的折射率和吸光度调制幅值

SPIE NanoScience + Engineering Pub Date : 2015-10-09 DOI: 10.1117/12.2194153

V. Borisov, A. Veniaminov

{"title":"Determination of refractive index and absorbance modulation amplitudes from angular selectivity of holograms in polymer material with phenanthrenequinone","authors":"V. Borisov, A. Veniaminov","doi":"10.1117/12.2194153","DOIUrl":"https://doi.org/10.1117/12.2194153","url":null,"abstract":"Amplitude and phase contributions to mixed volume holographic gratings were extracted from measured contours of angular selectivity. Holograms for the investigation were recorded in the glassy polymer material with phenan-threnequinone (PQ) using the DPSS CW laser (532 nm) and then self-developed due to molecular diffusion of PQ, reaching diffraction efficiency about 40%. Refractive index and absorbance modulation amplitudes of those holograms were obtained as adjustable parameters from theoretical equations by fitting angular dependencies of zeros and 1st orders diffraction efficiency measured at 450, 473, 532, and 633 nm at the different stages of hologram development. Mixed gratings manifest themselves in asymmetrical transmittance selectivity contours with one minimum and one maximum shifted with respect to the Bragg angle, while symmetrical contours with a minimum or a maximum at the Bragg angle are characteristic of pure phase and amplitude gratings, respectively. In the course of a hologram development, it converts from a predominantly amplitude-mixed to almost purely phase one in the case of readout using a light within the absorption band of PQ and maintains the phase nature besides it. The value of refractive index amplitude is ranging from 5×10-6 to 10-4 and the value of absorbance amplitude is up to 140 m-1.","PeriodicalId":432358,"journal":{"name":"SPIE NanoScience + Engineering","volume":"9545 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131222628","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: 5

Nanostructured organosilicon luminophores as a new concept of nanomaterials for highly efficient down-conversion of light 纳米结构有机硅发光基团是一种新型的光下转换纳米材料

SPIE NanoScience + Engineering Pub Date : 2015-10-09 DOI: 10.1117/12.2187281

S. Ponomarenko, N. Surin, O. Borshchev, M. Skorotetcky, A. Muzafarov

引用次数: 13

Investigation of Ta nanoparticles characteristics produced by laser ablation method 激光烧蚀法制备钽纳米颗粒的特性研究

SPIE NanoScience + Engineering Pub Date : 2015-10-09 DOI: 10.1117/12.2180754

F. Azadi Kenari, A. Sari, M. Ghoranneviss, M. Hantehzadeh

引用次数: 0