## Detail Information

### Publications

- Optimization of the gain-bandwidth product of capacitive micromachined ultrasonic transducersSelim Olcum

Electrical and Electronics Engineering Department, Bilkent University, Ankara Turkey*IEEE Trans Ultrason Ferroelectr Freq Control*52:2211-9. 2005..In particular, the effect of a shunt inductor in the gain-bandwidth product is investigated. Design tools are introduced, which are used to determine optimal dimensions of cMUTs with the specified frequency or gain response... - Tunable surface plasmon resonance on an elastomeric substrateSelim Olcum

Bilkent University, Electrical and Electronics Engineering Department, Ankara, Turkey*Opt Express*17:8542-7. 2009..It's been demonstrated that the Raman signal can be maximized by applying an external mechanical strain to the elastomeric grating... - Deep-collapse operation of capacitive micromachined ultrasonic transducersSelim Olcum

Bilkent University, Electrical and Electronics Engineering Department, Ankara, Turkey*IEEE Trans Ultrason Ferroelectr Freq Control*58:2475-83. 2011..8 MHz with a 106% fractional bandwidth at the surface of the transducer with a collapse voltage of 35 V, when the pulse amplitude is 160 V. The experimental results are verified using transient FEM simulations... - An equivalent circuit model for transmitting capacitive micromachined ultrasonic transducers in collapse modeSelim Olcum

Bilkent University, Electrical and Electronics Engineering Department, Ankara, Turkey*IEEE Trans Ultrason Ferroelectr Freq Control*58:1468-77. 2011..The circuit model is in good agreement with experimental results of pulse excitation applied to fabricated CMUTs. The model is suitable as a powerful design and optimization tool for collapsed and uncollapsed CMUTs... - Parametric linear modeling of circular cMUT membranes in vacuumHayrettin Koymen

Department, Bilkent University, Ankara, 06800 Turkey*IEEE Trans Ultrason Ferroelectr Freq Control*54:1229-39. 2007..Equivalent circuit model parameters can be found from material properties and membrane dimensions without a need for finite element simulation... - Nonlinear modeling of an immersed transmitting capacitive micromachined ultrasonic transducer for harmonic balance analysisH Kagan Oguz

Electronics Engineering Department, Bilkent University, Ankara, Turkey*IEEE Trans Ultrason Ferroelectr Freq Control*57:438-47. 2010..We observed much better agreement between FEM and the proposed equivalent model, compared with the conventional model... - An improved lumped element nonlinear circuit model for a circular CMUT cellHayrettin Koymen

Electrical and Electronics Engineering Department, Bilkent University, Ankara, Turkey*IEEE Trans Ultrason Ferroelectr Freq Control*59:1791-9. 2012..The model can be implemented in circuit simulation tools and model predictions are in excellent agreement with finite element method simulations... - Radiation impedance of an array of circular capacitive micromachined ultrasonic transducersMuhammed N Senlik

Electrical and Electronics Engineering Department, Bilkent University, Ankara, Turkey*IEEE Trans Ultrason Ferroelectr Freq Control*57:969-76. 2010..25 wavelengths maximizes the radiation resistance, if the membranes are not too thin. It is also found that excitation of nonsymmetric modes may reduce the radiation resistance in immersion applications... - Radiation impedance of collapsed capacitive micromachined ultrasonic transducersAlper Ozgurluk

Electrical and Electronics Engineering Department, Bilkent University, Ankara, Turkey*IEEE Trans Ultrason Ferroelectr Freq Control*59:1301-8. 2012.... - Reducing anchor loss in micromechanical extensional mode resonatorsV Tas

Bilkent University, Ankara, Turkey*IEEE Trans Ultrason Ferroelectr Freq Control*57:448-54. 2010..The electrical model gives results consistent with the finite element simulations. The proposed resonator is expected to have a very small anchor loss resulting in a very high Q...