A5101689560- Mechanical and Optical Resonators
- Advanced MEMS and NEMS Technologies
- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- Force Microscopy Techniques and Applications
- Quantum Information and Cryptography
- Advanced Thermodynamics and Statistical Mechanics
- Laser Design and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Atmospheric Ozone and Climate
- Superconducting and THz Device Technology
- Geophysics and Sensor Technology
- Energy Efficient Wireless Sensor Networks
- Diamond and Carbon-based Materials Research
- Wireless Sensor Networks and IoT
- Advanced Chemical Physics Studies
- Carbon Nanotubes in Composites
- Experimental and Theoretical Physics Studies
- Wireless Body Area Networks
- Semiconductor Lasers and Optical Devices
- Thermal Radiation and Cooling Technologies
- Graphene research and applications
- Gyrotron and Vacuum Electronics Research
- Physics of Superconductivity and Magnetism
- Atomic and Subatomic Physics Research
Royal Holloway University of London
2023-2024
Université Grenoble Alpes
2019-2023
Institut Néel
2018-2023
Centre National de la Recherche Scientifique
2019-2021
Indian Institute of Technology Delhi
2016
University of Calgary
2014
Massachusetts Institute of Technology
2010
Japan External Trade Organization
2010
We propose to create and detect opto-mechanical entanglement by storing one component of an entangled state light in a mechanical resonator then retrieving it. Using micro-macro as recently demonstrated experimentally, can states where the components superposition are macroscopically different. apply this general approach two-mode squeezed mode has undergone large displacement. Based on analysis relevant experimental imperfections, scheme appears feasible with current technology.
The nature of the quantum-to-classical crossover remains one most challenging open question Science to date. In this respect, moving objects play a specific role. Pioneering experiments over last few years have begun exploring quantum behaviour micron-sized mechanical systems, either by passively cooling single GHz modes, or adapting laser techniques developed in atomic physics cool low-frequency modes far below temperature their surroundings. Here instead we describe very different...
A terahertz (THz) heterodyne spectrometer is demonstrated based on a quantum cascade laser (QCL) as local oscillator (LO) and an NbN hot electron bolometer mixer, it used to measure high-resolution molecular spectral lines of methanol (CH3OH) between 2.913–2.918 THz. The are taken from gas cell containing using single-mode QCL at 2.9156 THz LO, which operated in the free running mode. By increasing pressure gas, line broadening saturation observed. measured spectra showed good agreement with...
We explore the nonlinear dynamics of a cavity optomechanical system. Our realization consisting drumhead nano-electro-mechanical resonator (NEMS) coupled to microwave cavity, allows for nearly ideal platform study nonlinearities arising purely due radiation-pressure physics. Experiments are performed under strong Stokes pumping which triggers mechanical self-sustained oscillations. analyze results in framework an extended theory, and demonstrate that quadratic cubic coupling terms...
Leveraging advancements in cavity optomechanics, we explore Optomechanically Induced Transparency/Absorption (OMIT/OMIA) the microwave domain at ambient temperature. Contrary to previous studies employing cryogenic temperatures, this work exploits a 3D architecture observe these effects temperature, broadening scope of possible applications. The successfully enhances optomechanical coupling strength, enabling observable and robust OMIT/OMIA effects, demonstrating up 25 dB signal...
We have developed a novel architecture for room temperature microwave cavity optomechanics, which is based on the coupling of 3D reentrant to compliant membrane. Devices parameters enabled resolving thermomechanical motion membrane, and observing optomechanically induced transparency/absorption in linear regime, first time optomechanical system operated at temperature. extracted single photon rate (g0) using four independent measurement techniques, hence obtain full characterization proposed system.
We apply the well-established theoretical method developed for geometrical nonlinearities of micro-/nano-mechanical clamped beams to circular drums. The calculation is performed under same hypotheses, extra difficulty being analytically describe (coordinate-dependent) additional stress generated in structure by motion. Specifically, model applies non-axisymmetric mode shapes. An analytic expression produced Duffing (hardening) nonlinear coefficient, which requires only knowledge shape...
Abstract We report on the quantitative experimental illustration of elementary optomechanics within classical regime. All measurements are performed in a commercial dilution refrigerator mesoscopic drumhead aluminium resonator strongly coupled to microwave cavity, using only strict single-tone schemes. Sideband asymmetry is reported in-cavity pumping, along with noise squashing and back-action effects. Results presented this paper analysed simple electric circuit theory, emphasizing...
As mobile networks and network speeds become more prevalent, the demand for marketing strategies increases. The operators are thinking about this, development of 5G communication is one their main concerns. need higher transmission increases, face challenges scalability adaptability. nextgeneration (NMCN-SDN) architecture proposed in this study based on Software-Defined Networks (SDN). A new model called computer-defined networking allows dynamic definition programming. simulator created to...
Within recent years, the field of nano-mechanics has diversified in a variety applications, ranging from quantum information processing to biological molecules recognition. Among diversity devices produced these days, simplest (but versatile) element remains doubly-clamped beam: it can store very large tensile stresses (producing high resonance frequencies $f_0$ and quality factors $Q$), is interfaceable with electric setups (by means conductive layers), be easily clean rooms (with scalable...
We apply the well-established theoretical method developed for geometrical nonlinearities of micro/nano-mechanical clamped beams to circular drums. The calculation is performed under same hypotheses, extra difficulty being analytically describe (coordinate-dependent) additional stress generated in structure by motion. Specifically, model applies non-axisymmetric mode shapes. An analytic expression produced Duffing (hardening) nonlinear coefficient, which requires only knowledge shape...
The mechanical properties of amorphous materials (glasses) at low temperatures are dominated by effects energy excitations that thought to be atomic-scale tunneling two level systems (TTLS). In nanometer-scale glass samples, the temperature dependence sound speed and dissipation is modified relative bulk samples. addition this size effect, usual presence a polycrystalline metal in nanomechanical resonators leads further departure from well-studied behavior insulating glass. We report dual...