Ultrathin, Ultrasmooth And Low-Loss Silver Films Via Wetting And Annealing,
2010
University of Michigan - Ann Arbor
Ultrathin, Ultrasmooth And Low-Loss Silver Films Via Wetting And Annealing, Weiqiang Chen, Kuo-Ping Chen, Mark Daniel Thoreson, Alexander Kildishev, Vladimir M. Shalaev
Weiqiang Chen
We have demonstrated that a thermal annealing treatment can reduce the optical losses in ultrathin, ultrasmooth, silver films deposited on a Ge wetting layer to values as low as the bulk material value and at the same time maintain an ultrasmooth surface. The annealing effect is sensitive to the annealing temperature and time, both of which should be carefully controlled. This annealing treatment is also effective for Ag–SiO2 multilayer composite films.
Toward Superlensing With Metal-Dielectric Composites And Multilayers,
2010
University of Michigan - Ann Arbor
Toward Superlensing With Metal-Dielectric Composites And Multilayers, Rasmus Bundgaard Nielsen, Mark Thoreson, Weiqiang Chen, Anders Kristensen, Jørn Hvam, Vladimir M. Shalaev, Alexandra Boltasseva
Weiqiang Chen
We report on the fabrication of two types of adjustable, near-field superlens designs: metal–dielectric composites and metal–dielectric multilayer films. We fabricated a variety of films with different materials, thicknesses and compositions. These samples were characterized physically and optically to determine their film composition, quality, and optical responses. Our results on metal–dielectric composites indicate that although the real part of the effective permittivity generally follows effective medium theory predictions, the imaginary part does not and substantially higher losses are observed. Going forward, it appears that multilayer metal–dielectric designs are more suitable for sub-diffraction imaging applications because they could provide both tunability …
Fabrication And Optical Characterizations Of Smooth Silver-Silica Nanocomposite Films,
2010
University of Michigan - Ann Arbor
Fabrication And Optical Characterizations Of Smooth Silver-Silica Nanocomposite Films, Weiqiang Chen, Mark Daniel Thoreson, Alexander V. Kildishev, Vladimir Shalaev
Weiqiang Chen
We have studied the surface-smoothing effect of an ultrathin germanium (Ge) layer on silver (Ag)-silica (SiO2) nanocomposite films for superlensing applications. Our experimental results indicate that inserting a thin Ge layer below the silver-silica composite films can reduce the final surface root-mean-squared (RMS) roughness to under 1 nm. Additionally, the metal nanostructure plays a role in both the smoothing effect and the optical properties of the nanocomposite films. Our experimental results show that the Bruggeman effective medium theory (EMT) is not sufficiently accurate to describe some properties of our nanocomposite films. In addition to the constituent materials and their filling …
Terahertz And Microwave Detection Using Metallic Single Wall Carbon Nanotubes,
2010
University of Massachusetts Amherst
Terahertz And Microwave Detection Using Metallic Single Wall Carbon Nanotubes, Enrique A. Carrion
Masters Theses 1911 - February 2014
Carbon nanotubes (CNTs) are promising nanomaterials for high frequency applications due to their unique physical characteristics. CNTs have a low heat capacity, low intrinsic capacitance, and incredibly fast thermal time constants. They can also exhibit ballistic transport at low bias, for both phonons and electrons, as evident by their fairly long mean free paths. However, despite the great potential they present, the RF behavior of these nanostructures is not completely understood. In order to explore this high frequency regime we studied the microwave (MW) and terahertz (THz) response of individual and bundled single wall nanotube based devices. This thesis is …
Super-High-Frequency Two-Port Aln Contour-Mode Resonators For Rf Applications,
2010
University of Pennsylvania
Super-High-Frequency Two-Port Aln Contour-Mode Resonators For Rf Applications, Matteo Rinaldi, Chiara Zuniga, Chengjie Zuo, Gianluca Piazza
Departmental Papers (ESE)
This paper reports on the design and experimental verification of a new class of thin-film (250 nm) superhigh- frequency laterally-vibrating piezoelectric microelectromechanical (MEMS) resonators suitable for the fabrication of narrow-band MEMS filters operating at frequencies above 3 GHz. The device dimensions have been opportunely scaled both in the lateral and vertical dimensions to excite a contourextensional mode of vibration in nanofeatures of an ultra-thin (250 nm) AlN film. In this first demonstration, 2-port resonators vibrating up to 4.5 GHz have been fabricated on the same die and attained electromechanical coupling, kt^2, in excess of 1.5%. These devices are employed to …
Theory Of ‘Selectivity’ Of Label-Free Nanobiosensors – A Geometro-Physical Perspective,
2010
Purdue University - Main Campus
Theory Of ‘Selectivity’ Of Label-Free Nanobiosensors – A Geometro-Physical Perspective, Pradeep R. Nair, Muhammad A. Alam
Birck and NCN Publications
Modern label-free biosensors are generally far more sensitive and require orders of magnitude less incubation time compared to their classical counterparts. However, a more important characteristic regarding the viability of this technology for applications in Genomics/Proteomics is defined by the ‘Selectivity’, i.e., the ability to concurrently and uniquely detect multiple target biomolecules in the presence of interfering species. Currently, there is no theory of Selectivity that allows optimization of competing factors and there are few experiments to probe this problem systematically. In this article, we use the elementary considerations of surface exclusion, diffusion limited transport, and void distribution function to …
Technological Challenges Of 1-Dimensional Magnetic Photonic Crystals,
2010
Edith Cowan University
Technological Challenges Of 1-Dimensional Magnetic Photonic Crystals, Mikhail Vasiliev, Kamal Alameh, Dmitry E. Balabanov, Vladimir I. Burkov, V. V. Koledov, Viacheslav A. Kotov, V. G. Shavrov, Anotoly K. Zvezdin
Research outputs pre 2011
Visible-region magnetic photonic crystals (MPC) designed for higher-order bandgap operation have been proposed to overcome the technological restrictions originating from the strong thickness dependency of the individual magnetic layer properties observed in MPC structures.
Super-High-Frequency Two-Port Aln Contour-Mode Resonators For Rf Applications,
2009
University of Pennsylvania
Super-High-Frequency Two-Port Aln Contour-Mode Resonators For Rf Applications, Matteo Rinaldi, Chiara Zuniga, Chengjie Zuo, Gianluca Piazza
Matteo Rinaldi
This paper reports on the design and experimental verification of a new class of thin-film (250 nm) super-high-frequency laterally-vibrating piezoelectric microelectromechanical (MEMS) resonators suitable for the fabrication of narrow-band MEMS filters operating at frequencies above 3 GHz. The device dimensions have been opportunely scaled both in the lateral and vertical dimensions to excite a contour-extensional mode of vibration in nanofeatures of an ultra-thin (250 nm) AlN film. In this first demonstration, 2-port resonators vibrating up to 4.5 GHz have been fabricated on the same die and attained electromechanical coupling, kt2, in excess of 1.5%. These devices are employed to synthesize …
The Effect Of The Digit Slicing Architecture On The Fft Butterfly,
2009
Faculty of Engineering, Technology and Built Environment UCSI University
The Effect Of The Digit Slicing Architecture On The Fft Butterfly, Yazan Samir, Rozita Teymourzadeh
Dr. Rozita Teymourzadeh, CEng.
Vlsi Implementation Of Novel Class Of High Speed Pipelined Digital Signal Processing Filter For Wireless Receivers,
2009
Faculty of Engineering, Technology and Built Environment UCSI University
Vlsi Implementation Of Novel Class Of High Speed Pipelined Digital Signal Processing Filter For Wireless Receivers, Rozita Teymourzadeh, Yazan Samir, Shabuil Islam, Masuri Othman, Mok Vh
Dr. Rozita Teymourzadeh, CEng.
Design Of Automatic Soil Humidity Control Using Maximum Power Point Tracking Controller,
2009
Faculty of Engineering, Technology and Built Environment UCSI University
Design Of Automatic Soil Humidity Control Using Maximum Power Point Tracking Controller, Hoe Ck, Vaithlingam A.C., Rozita Teymourzadeh, Rajkumar R
Dr. Rozita Teymourzadeh, CEng.
On-Chip Implementation Of Pipeline Digit-Slicing Multiplier-Less Butterfly For Fast Fourier Transform Architecture,
2009
Faculty of Engineering, Technology and Built Environment UCSI University
On-Chip Implementation Of Pipeline Digit-Slicing Multiplier-Less Butterfly For Fast Fourier Transform Architecture, Yazan Samir, Rozita Teymourzadeh, Masuri Othman, Shabiul Islam, Mok Vh
Dr. Rozita Teymourzadeh, CEng.
On-Chip Implementation Of High Resolution High Speed Floating Point Adder/Subtractor With Reducing Mean Latency For Ofdm,
2009
Faculty of Engineering, Technology and Built Environment UCSI University
