Publications de Alexander Tagantsev

Generation of squeezed Fock states by measurement

The generation of squeezed Fock states by the one or more photon subtraction from a two-mode entangled Gaussian (TMEG) state is theoretically addressed. We showed that an arbitrary order Fock state can be generated this way and we obtained a condition that ...

Amer Physical Soc2024

Paradoxical creation of a polydomain pattern by electric field in BaTiO3 crystal

Alexander Tagantsev

It is known that ferroelectric single crystals can be turned from a polydomain to a monodomain state by the application of an electric field. Here we report an unexpected opposite effect: the formation of through-the-crystal polydomain pattern in a monodom ...

2024

Optimal optomechanical cavity setups with highly reflecting membranes

Alexander Tagantsev

Highly reflecting mechanically compliant membranes based on photonic-crystal patterns have recently gained increasing attention within cavity optomechanics due to their prospects of reaching high coupling rates in membrane-in-the-middle experiments. Here, ...

2024

Phononically shielded photonic-crystal mirror membranes for cavity quantum optomechanics

Alexander Tagantsev

We present a highly reflective, sub-wavelength-thick membrane resonator featuring high mechanical quality factor and discuss its applicability for cavity optomechanics. The 88.5 nm thin stoichiometric silicon-nitride membrane, designed and fabricated to co ...

Optica Publishing Group2023

Dissipative optomechanical coupling with a membrane outside of an optical cavity

Alexander Tagantsev

We theoretically study an optomechanical system which consists of a two-sided cavity and a mechanical membrane that is placed outside of it. The membrane is positioned close to one of its mirrors, and the cavity is coupled to the external light field throu ...

AMER PHYSICAL SOC2021

Electric field control of antiferroelectric domain pattern

Alexander Tagantsev

Control of domain and domain wall configurations in antiferroelectrics is a necessary step towards practical use of new functionalities based on polar domain wall structures. Here we propose and demonstrate a domain engineering scheme that provides an anti ...

AMER PHYSICAL SOC2021

Spontaneous symmetry breaking in an optomechanical cavity

Alexander Tagantsev

A theoretical consideration of the so-called "membrane-in-the-middle" optomechanical cavity revealed that it undergoes a spontaneous symmetry breaking as a function of transparency of the membrane. Such typical features of this phenomenon as a square-root ...

AMER PHYSICAL SOC2020

Dissipative-coupling-assisted laser cooling: Limitations and perspectives

Alexander Tagantsev

The recently identified possibility of ground-state cooling of a mechanical oscillator in the unresolved sideband regime by combination of the dissipative and dispersive optomechanical coupling under the red sideband excitation [Phys. Rev. A 88, 023850 (20 ...

AMER PHYSICAL SOC2020

Theoretical estimation of the linear electro-optic effect in compressively strained c-domain (Ba, Sr)TiO3 thin films using a phenomenological thermodynamic model

Nava Setter, Alexander Tagantsev

The influence of compressive strain on the linear electro-optic (EO) effect in c-domain (BaxSr1-x)TiO3 (BST) thin films was theoretically investigated using a phenomenological thermodynamic model. We considered that the c-domain BST thin films were grown o ...

CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI2019

Quantum-Limited Measurements Using an Optical Cavity with Modulated Intrinsic Loss

Alexander Tagantsev, Sergey Fedorov

We analyze a cavity optomechanical setup, in which the position of an oscillator modulates the internal optical loss. We show that, in contrast to systems with a fixed internal loss, in such a setup, quantum-limited position measurements can be performed a ...

AMER PHYSICAL SOC2019