Pub Date : 2012-12-01DOI: 10.1109/COMMAD.2012.6472397
P. Parkinson, K. Peng, N. Jiang, Q. Gao, H. Tan, C. Jagadish
A non-linear photolithography technique is presented, providing a new, rapid and damage-free method of contacting semiconductor nanowires. In addition, by using nanowires with room-temperature luminescence, a through-resist photoluminescence step provides a verifiable route to contacting high-quality wires [1].
{"title":"Non-linear direct-laser-write lithography for semiconductor nanowire characterisation","authors":"P. Parkinson, K. Peng, N. Jiang, Q. Gao, H. Tan, C. Jagadish","doi":"10.1109/COMMAD.2012.6472397","DOIUrl":"https://doi.org/10.1109/COMMAD.2012.6472397","url":null,"abstract":"A non-linear photolithography technique is presented, providing a new, rapid and damage-free method of contacting semiconductor nanowires. In addition, by using nanowires with room-temperature luminescence, a through-resist photoluminescence step provides a verifiable route to contacting high-quality wires [1].","PeriodicalId":136573,"journal":{"name":"COMMAD 2012","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114713268","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}
Pub Date : 2012-12-01DOI: 10.1109/COMMAD.2012.6472420
P. Zhang, Shujuan Huang, G. Conibeer
An efficient deposition method for colloidal nanoparticles (NPs), Langmuir-Blodgett (LB) deposition is investigated and used to fabricate close- packed arrays of silicon (Si) NPs. Both amorphous and ordered arrays are achievable by tuning the stabilizing time and surface pressure (SP) of the LB film on the surface of water in the LB procedures. The deposited NP layers were characterised by AFM and TEM. AFM observation showed successful formation of monolayers, while TEM results clearly showed the orientations of the arrays. Such arrays might be used as the absorber materials of hot carrier solar cells because of their potential for strong phonon confinement [1].
{"title":"Fabrication of two-dimensional close-packed arrays of colloidal silicon nanoparticles via Langmuir-Blodgett deposition","authors":"P. Zhang, Shujuan Huang, G. Conibeer","doi":"10.1109/COMMAD.2012.6472420","DOIUrl":"https://doi.org/10.1109/COMMAD.2012.6472420","url":null,"abstract":"An efficient deposition method for colloidal nanoparticles (NPs), Langmuir-Blodgett (LB) deposition is investigated and used to fabricate close- packed arrays of silicon (Si) NPs. Both amorphous and ordered arrays are achievable by tuning the stabilizing time and surface pressure (SP) of the LB film on the surface of water in the LB procedures. The deposited NP layers were characterised by AFM and TEM. AFM observation showed successful formation of monolayers, while TEM results clearly showed the orientations of the arrays. Such arrays might be used as the absorber materials of hot carrier solar cells because of their potential for strong phonon confinement [1].","PeriodicalId":136573,"journal":{"name":"COMMAD 2012","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123844983","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}
Pub Date : 2012-12-01DOI: 10.1109/COMMAD.2012.6472401
M. Aramesh, J. Červenka, R. Rajasekharan, D. Garrett, J. Fang, K. Ostrikov, S. Prawer
We report fabrication and optical properties of electrochemically deposited silver nanowires into nanoporous alumina template. A finite element method is used to study plasmonic coupling of dipole emitters with the silver nanowires.
{"title":"Optical properties of silver nanowires grown electrochemically in nanoporous alumina","authors":"M. Aramesh, J. Červenka, R. Rajasekharan, D. Garrett, J. Fang, K. Ostrikov, S. Prawer","doi":"10.1109/COMMAD.2012.6472401","DOIUrl":"https://doi.org/10.1109/COMMAD.2012.6472401","url":null,"abstract":"We report fabrication and optical properties of electrochemically deposited silver nanowires into nanoporous alumina template. A finite element method is used to study plasmonic coupling of dipole emitters with the silver nanowires.","PeriodicalId":136573,"journal":{"name":"COMMAD 2012","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122392716","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}
Pub Date : 2012-12-01DOI: 10.1109/COMMAD.2012.6472367
A. Podolska, R. Seeber, U. Mishra, K. Pfleger, G. Parish, B. Nener
We have investigated application of AlGaN/GaN cell-based biosensors for detection of biological reactions in response to the drug ionomycin. The device sensitivity was dependent on environmental factors such as temperature and atmospheric composition. A significant improvement in signal amplitude was obtained through stabilisation of measurement conditions. These results are an important step in development and optimisation of reliable AlGaN/GaN cell-based biosensors.
{"title":"Detection of biological reactions by AlGaN/GaN biosensor","authors":"A. Podolska, R. Seeber, U. Mishra, K. Pfleger, G. Parish, B. Nener","doi":"10.1109/COMMAD.2012.6472367","DOIUrl":"https://doi.org/10.1109/COMMAD.2012.6472367","url":null,"abstract":"We have investigated application of AlGaN/GaN cell-based biosensors for detection of biological reactions in response to the drug ionomycin. The device sensitivity was dependent on environmental factors such as temperature and atmospheric composition. A significant improvement in signal amplitude was obtained through stabilisation of measurement conditions. These results are an important step in development and optimisation of reliable AlGaN/GaN cell-based biosensors.","PeriodicalId":136573,"journal":{"name":"COMMAD 2012","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125058224","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}
Pub Date : 2012-12-01DOI: 10.1109/COMMAD.2012.6472379
L. Mawst, D. Botez, T. Kuech
We have investigated the use of Metamorphic Buffer Layer (MBL) structures for the realization mid-infrared semiconductor lasers employing either interband or intersubband transitions. The resulting surface morphology of the MBL is generally cross-hatched along the orthogonal <;110> directions. This surface morphology may negatively impact device structures grown on top of the MBL. We have employed two different techniques to improve the surface morphology of MBLs, while maintaining an epiappropriate surface chemical composition and structure: (1) Introduction of Sb as a surfactant to create novel step-graded MBLs; and (2) Chemical-Mechanical-Polishing (CMP) of the MBL followed by MOCVD regrowth of layers atop the MBL.
{"title":"Metamorphic buffer layers for mid-infrared emitting semiconductor lasers","authors":"L. Mawst, D. Botez, T. Kuech","doi":"10.1109/COMMAD.2012.6472379","DOIUrl":"https://doi.org/10.1109/COMMAD.2012.6472379","url":null,"abstract":"We have investigated the use of Metamorphic Buffer Layer (MBL) structures for the realization mid-infrared semiconductor lasers employing either interband or intersubband transitions. The resulting surface morphology of the MBL is generally cross-hatched along the orthogonal <;110> directions. This surface morphology may negatively impact device structures grown on top of the MBL. We have employed two different techniques to improve the surface morphology of MBLs, while maintaining an epiappropriate surface chemical composition and structure: (1) Introduction of Sb as a surfactant to create novel step-graded MBLs; and (2) Chemical-Mechanical-Polishing (CMP) of the MBL followed by MOCVD regrowth of layers atop the MBL.","PeriodicalId":136573,"journal":{"name":"COMMAD 2012","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122450490","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}
Pub Date : 2012-12-01DOI: 10.1109/COMMAD.2012.6472381
W. J. Toe, K. Pearce, F. Wang, P. Reece
We report a method of characterising physical and optical properties of nanoparticles using optical tweezers combined with dark field microscopy. The technique uses measurements from Brownian dynamics of the trapped nanoparticles to determine localised surface plasmon resonance (LSPR) spectroscopy to determine nanoparticle size information.
{"title":"Dark field optical tweezers for studying nanoparticle dynamics","authors":"W. J. Toe, K. Pearce, F. Wang, P. Reece","doi":"10.1109/COMMAD.2012.6472381","DOIUrl":"https://doi.org/10.1109/COMMAD.2012.6472381","url":null,"abstract":"We report a method of characterising physical and optical properties of nanoparticles using optical tweezers combined with dark field microscopy. The technique uses measurements from Brownian dynamics of the trapped nanoparticles to determine localised surface plasmon resonance (LSPR) spectroscopy to determine nanoparticle size information.","PeriodicalId":136573,"journal":{"name":"COMMAD 2012","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117349325","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}
Pub Date : 2012-12-01DOI: 10.1109/COMMAD.2012.6472389
M. Tanaka, S. Ohya, P. Hai, R. Nakane
Introducing spin degrees of freedom into the present semiconductor electronics is a very important issue for realizing novel devices which will be needed in the future information technology. For fabricating such devices, it is necessary to exploit and fabricate semiconductor-based magnetic materials. III-V-based ferromagnetic semiconductors and MnAs/III-V hybrid nanostructures are hopeful candidates and model systems for future spintronic devices [1, 2].
{"title":"Spintronics materials and devices - ferromagnetic semiconduc-tors and heterostructures","authors":"M. Tanaka, S. Ohya, P. Hai, R. Nakane","doi":"10.1109/COMMAD.2012.6472389","DOIUrl":"https://doi.org/10.1109/COMMAD.2012.6472389","url":null,"abstract":"Introducing spin degrees of freedom into the present semiconductor electronics is a very important issue for realizing novel devices which will be needed in the future information technology. For fabricating such devices, it is necessary to exploit and fabricate semiconductor-based magnetic materials. III-V-based ferromagnetic semiconductors and MnAs/III-V hybrid nanostructures are hopeful candidates and model systems for future spintronic devices [1, 2].","PeriodicalId":136573,"journal":{"name":"COMMAD 2012","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115534718","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}
Pub Date : 2012-12-01DOI: 10.1109/COMMAD.2012.6472377
N. Krishnan, M. Martyniuk, R. Jeffery, R. Woodward, J. Dell, L. Faraone
Rare earth cerium substituted europium iron garnets (CeEu)3(FeGa)5O12 (Ce:EIG) as well as the elemental oxides were deposited on fused quartz substrates using Biased Target Deposition (BTD). The Ce:EIG films are prepared at low temperature (80-120°C) by sputtering four metallic targets simultaneously using a low energy ion beam. This method provides control over the material composition in a predictable way by controlling the bias duty cycle on individual targets.
{"title":"Control of chemical composition of rare-earth substituted iron garnets using biased target deposition","authors":"N. Krishnan, M. Martyniuk, R. Jeffery, R. Woodward, J. Dell, L. Faraone","doi":"10.1109/COMMAD.2012.6472377","DOIUrl":"https://doi.org/10.1109/COMMAD.2012.6472377","url":null,"abstract":"Rare earth cerium substituted europium iron garnets (CeEu)3(FeGa)5O12 (Ce:EIG) as well as the elemental oxides were deposited on fused quartz substrates using Biased Target Deposition (BTD). The Ce:EIG films are prepared at low temperature (80-120°C) by sputtering four metallic targets simultaneously using a low energy ion beam. This method provides control over the material composition in a predictable way by controlling the bias duty cycle on individual targets.","PeriodicalId":136573,"journal":{"name":"COMMAD 2012","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131388922","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}
Pub Date : 2012-12-01DOI: 10.1109/COMMAD.2012.6472404
S. Fricke, A. Burke, A. Micolich
A number of approaches currently exist for obtaining the Landé effective g-factor g* from experimental measurements of the ac and dc conductance of AlGaAs/GaAs Quantum Point Contacts (QPCs). The correspondence between these methods is not perfect, motivating us to develop an analytical model for assessing the relative accuracy of the various approaches using a perfect, experimental artefact-free data-set. We will present a comparative study of the accuracy of ac and dc-based methods for determining the g-factor in QPCs.
{"title":"A numerical model for determining the relative accuracy of the Landé g-factor obtained from ac and dc conductance measurements of Quantum Point Contacts","authors":"S. Fricke, A. Burke, A. Micolich","doi":"10.1109/COMMAD.2012.6472404","DOIUrl":"https://doi.org/10.1109/COMMAD.2012.6472404","url":null,"abstract":"A number of approaches currently exist for obtaining the Landé effective g-factor g* from experimental measurements of the ac and dc conductance of AlGaAs/GaAs Quantum Point Contacts (QPCs). The correspondence between these methods is not perfect, motivating us to develop an analytical model for assessing the relative accuracy of the various approaches using a perfect, experimental artefact-free data-set. We will present a comparative study of the accuracy of ac and dc-based methods for determining the g-factor in QPCs.","PeriodicalId":136573,"journal":{"name":"COMMAD 2012","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123736455","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}
Pub Date : 2012-12-01DOI: 10.1109/COMMAD.2012.6472385
L. Rosa, G. Gervinskas, E. Brasselet, S. Juodkazis
We simulate the spectral properties of simple plasmonic nanoparticles (NPs), which we have fabricated with electron beam lithography (EBL) and lift-off, with or without nano-grooves milled by ion-beam lithography (IBL). We estimate the NP behaviour under laser illumination using 3D finite difference time domain (FDTD) simulations, showing that simple non-chiral NPs can generate torque from circularly polarized beams and emit optical vortices via spin-orbit coupling. We demonstrate numerically the position and intensity control of field enhancement hot-spots in chiral NPs illuminated by optical vortex, by combining spin/orbit momentum and NP chirality.
{"title":"Plasmonic nano-structures for opto-mechanical and sensing applications","authors":"L. Rosa, G. Gervinskas, E. Brasselet, S. Juodkazis","doi":"10.1109/COMMAD.2012.6472385","DOIUrl":"https://doi.org/10.1109/COMMAD.2012.6472385","url":null,"abstract":"We simulate the spectral properties of simple plasmonic nanoparticles (NPs), which we have fabricated with electron beam lithography (EBL) and lift-off, with or without nano-grooves milled by ion-beam lithography (IBL). We estimate the NP behaviour under laser illumination using 3D finite difference time domain (FDTD) simulations, showing that simple non-chiral NPs can generate torque from circularly polarized beams and emit optical vortices via spin-orbit coupling. We demonstrate numerically the position and intensity control of field enhancement hot-spots in chiral NPs illuminated by optical vortex, by combining spin/orbit momentum and NP chirality.","PeriodicalId":136573,"journal":{"name":"COMMAD 2012","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123711554","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}
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