Florent Bassignot

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This work is devoted to the development of laterally coupled filters built on compound single crystal substrates. High overtone bulk acoustic resonators are built on LiNbO<inf>3</inf> thinned films bonded on thick LiNbO<inf>3</inf> or Quartz substrates. Two resonators are coupled via a narrow gap between their electrodes, yielding the possibility for their(More)
In this paper, we present new results on the development of piezoelectric transducers based on periodically poled ferroelectric domains in a lithium niobate plate bonded between two silicon wafers. The fabrication of the periodically poled transducers operating in the range 50 &#x2013; 500 MHz has been achieved on a 3 inches 500 &#x00B5;m thick wafer. These(More)
The constant improvement of industrial needs to face modern telecommunication challenges leads to the development of novel transducer principles as alternatives to SAW and BAW solutions. The main technological limits of SAW (short-circuit between electrodes) and BAW (precise thickness control) solutions can be overcome by a new kind of transducer based on(More)
In this paper, we present new results on the development of piezoelectric transducers based on periodically poled ferroelectric domains in a lithium niobate plate bonded between two silicon wafers. The fabrication of the periodically poled transducers operating in the range 50 &#x2013; 500 MHz has been achieved on a 3 inches 500 &#x00B5;m thick wafer. These(More)
In this paper, we propose a new concept of acoustic resonator based on a waveguide structure. In the telecommunication market, composants used are indeed generally bases on Surface Acoustic Wave (SAW) or Bulk Acoustic Wave (BAW) devices. However, those systems present technological limits as short-circuits between the electrodes of the interdigital(More)
We report light-beam self-trapping triggered by the pyroelectric effect in an isolated ferroelectric thin film. Experiments are performed in an 8-μm-thick congruent undoped LiNbO(3) film bonded onto a silicon wafer. Response time two orders of magnitude faster than in bulk LiNbO(3) is reported. The original underlying physics specific of this arrangement is(More)
Transducer on Periodically Poled Lithium Niobate (PPLN) exhibiting an electromechanical coupling about 20% and an equivalent phase velocity about 10 km.s<sup>-1</sup> were shown in [1]. These transducers are 3D structured to overcome Surface Acoustic Wave (SAW) and Bulk Acoustic Wave (BAW) technological limits, such as short circuit between electrodes for(More)
Electrically tunable channel waveguides have been fabricated by domain inversion of a LiNbO<sub>3</sub> thin film bonded to a silicon wafer. The electro-optic effect is used to induce the waveguides and to alter its guiding properties. A low amplitude electric signal can tune the voltage-induced structure from an efficient waveguide to an antiguide giving a(More)
In this paper, we propose new structures based on &#x201C;Silicon/PPLN thin film&#x201D; hybrid wafers for nonlinear-optical and Radio-Frequency applications. This stack is obtained by home-made room-temperature bonding and wafer thinning techniques. Two main wafer bonding techniques have been developed on 3 and 4-inch wafers. The Au/Au bonding for RF(More)