| 1. |
- Agten, Dries, et al.
(författare)
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Modeling of a scalable coupled resonator array for microshutter applications
- 2011
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Ingår i: MME 22, Micromechanics and Micro systems Europe Workshop, June 19-22, 2011, Toensberg, Norway. - 9788278602249 ; , s. 154-157
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Konferensbidrag (refereegranskat)abstract
- In this paper we present the resultsfrom the finite element analysis of a scalablecoupled resonator array for ultrafast microshutterapplications. This new design concept builds on thedesign of a previous microshutter array, but couplesthe shutters to each other to allow them to move in acoupled antiphase resonance mode. Simulations forarray scalability show that the resonance frequencydoes not change significantly when adding rowsor columns to the array. The desired resonancemode stays present during scaling. Analyzingthe sensitivity to changing dimensions results inslightly different amplitudes but no change inphase difference between adjacent shutters at theresonance frequency.
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| 2. |
- Ahmed, S, 1970, et al.
(författare)
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Fractal-based dual-band small antenna for 2.45 and 5.8 GHz
- 2010
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Ingår i: 21st Micromechanics and Micro systems Europe workshop, 26-29 September 2010, Enschede, The Netherlands. ; , s. 108-111
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Konferensbidrag (refereegranskat)abstract
- Small antennas are becoming important andrequired for many domestic and commercial wireless applications.New design and first experimental results confirmingthe simulations of multi-band patch antenna optimized for the2.45 GHz and 5.8 GHz bands are presented. This design isbased on the practical considerations found for our Minkowski-based fractal antenna that predict the influence ofgeometry modifications on the frequency of operation.
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| 3. |
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| 4. |
- Alavian Ghavanini, Farzan, 1978, et al.
(författare)
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A method to evaluate MEMS bonding
- 2006
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Ingår i: Micro Structure Workshop 2006. ; 1:1, s. 47-B3d
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Konferensbidrag (refereegranskat)
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| 5. |
- Alavian Ghavanini, Farzan, 1978, et al.
(författare)
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An easy-to-implement method for evaluation of capacitive resonant sensors
- 2006
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Ingår i: Journal of Micromechanics and Microengineering. - 1361-6439 .- 0960-1317. ; 16:6, s. s156-s160
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Tidskriftsartikel (refereegranskat)abstract
- A novel method that can be used to characterize resonant capacitive sensors is presented. The method is based on measurement of the third harmonic of the current through the capacitor; thus the detection signal is frequencyseparated from the excitation signal. The measurement is time-continuousand only requires a very simple resonant structure where a single electrode is simultaneously used for excitation and detection. The readout circuit iseasily implemented with a single operational amplifier and standard equipment such as a lock-in amplifier or a function generator and a spectrum analyzer. Measurements of a resonant structure confirm the feasibility of the concept.
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| 6. |
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| 7. |
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| 8. |
- Alavian Ghavanini, Farzan, 1978, et al.
(författare)
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CMOS considerations in nanoelectromechanical carbon nanotube-based switches
- 2008
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Ingår i: Nanotechnology. - 1361-6528 .- 0957-4484.
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, we focus on critical issues directly related to the viability of carbon nanotube-based nanoelectromechanical switches, to perform their intended functionality as logic and memory elements, through assessment of typical performance parameters with reference to complementary metal-oxide-semiconductor devices. A detailed analysis of performance metrics regarding threshold voltage control, static and dynamic power dissipation, speed, and integration density is presented. Apart from packaging and reliability issues, these switches seem to be competitive in low power, particularly low-standby power, logic and memory applications.
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| 9. |
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| 10. |
- Alavian Ghavanini, Farzan, 1978, et al.
(författare)
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Controlling the initial phase of PECVD growth of vertically aligned carbon nanofibres on TiN
- 2011
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Ingår i: Sensors and Actuators A-Physical. - : Elsevier BV. - 0924-4247 .- 1873-3069. ; 172:1, s. 347-358
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Tidskriftsartikel (refereegranskat)abstract
- We explore the growth of vertically aligned carbon nanofibers by plasma enhanced chemical vapor deposition, using lithographically defined Ni catalyst seeds on TiN. TiN is selected for being an electrically conducting diffusion barrier suitable for the realization of electronic devices. We show that the rate of Ni diffusion correlates to both the level of oxygen content in the TiN film and to the film resistivity. The synthesis of the nanofibers was characterized using electron microscopy with an emphasis on three growth parameters: substrate temperature, plasma power, and chamber pressure. We propose that a catalyst surface free from carbon deposits throughout the process will induce diffusion-limited growth. The growth will shift towards a supply-limited process when the balance between acetylene, as the effective carbon bearing gas, and atomic hydrogen, as the main etching agent, is skewed in favor of acetylene. This determines whether the dominating growth mode will be vertically aligned tip-type or disordered base-type, by affecting the competition between the formation of the first graphitic sheets on the catalyst surface and at the catalyst-substrate interface
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