Phononically shielded photonic-crystal mirror membranes for cavity quantum optomechanics

Enzian, Georg; Wang, Zihua; Simonsen, Anders; Mathiassen, Jonas; Toke, Vibel,; Tsaturyan, Yeghishe; Tagantsev, Alexandre; Schließer, Albert; Polzik, E. S.

doi:10.1364/oe.484369

Cited by 11 publications

(1 citation statement)

References 41 publications

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“…Suspended PhCs combine excellent mechanical and optical properties due to their small weight, low mechanical dissipation, and engineerable optical reflectivity [24][25][26][27][28][29]. As a consequence, PhC slabs have been considered in theoretical proposals for optomechanical systems [30,31] and have been used in various optomechanical experiments already [28,[32][33][34]. Recently, it was shown that a cavity optomechanical system formed between two suspended PhC slabs realizes a Fabry-Perot-type optical BIC [5,8], exhibiting a quality factor only limited by intrinsic loss in the material [17,[35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Quasibound states in the continuum in photonic crystal based optomechanical microcavities

Péralle,

Manjeshwar,

Ciers

et al. 2024

Phys. Rev. B

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We present a detailed study of mechanically compliant, photonic crystal based microcavities featuring a quasibound state in the continuum. Such systems were recently predicted to reduce the optical loss in Fabry-Pérot-type optomechanical cavities. However, they require two identical photonic crystal slabs facing each other, which poses a considerable challenge for experimental implementation. We investigate how such an ideal system can be simplified and still exhibit a quasibound state in the continuum. We find that a suspended photonic crystal slab facing a distributed Bragg reflector realizes an optomechanical system with a quasibound state in the continuum. In this system, the radiative cavity loss can be eliminated to the extent that the cavity loss is dominated by dissipative loss originating from material absorption only. These proposed optomechanical cavity designs are predicted to feature optical quality factors in excess of 10 5 .

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Section: Introductionmentioning

confidence: 99%

Quasibound states in the continuum in photonic crystal based optomechanical microcavities

Péralle,

Manjeshwar,

Ciers

et al. 2024

Phys. Rev. B

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Nanomechanical Crystalline AlN Resonators with High Quality Factors for Quantum Optoelectromechanics

Ciers,

Jung,

Ciers

et al. 2024

Advanced Materials

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High‐quality factor (Qm) mechanical resonators are crucial for applications where low noise and long coherence time are required, as mirror suspensions, quantum cavity optomechanical devices, or nanomechanical sensors. Tensile strain in the material enables the use of dissipation dilution and strain engineering techniques, which increase the mechanical quality factor. These techniques have been employed for high‐Qm mechanical resonators made from amorphous materials and, recently, from crystalline materials such as InGaP, SiC, and Si. A strained crystalline film exhibiting substantial piezoelectricity expands the capability of high‐Qm nanomechanical resonators to directly utilize electronic degrees of freedom. In this work, nanomechanical resonators with Qm up to 2.9 × 107 made from tensile‐strained 290 nm‐thick AlN are realized. AlN is an epitaxially‐grown crystalline material offering strong piezoelectricity. Nanomechanical resonators that exploit dissipation dilution and strain engineering to reach a Qm × fm‐product approaching 1013 Hz at room temperature are demonstrated. A novel resonator geometry is realized, triangline, whose shape follows the Al–N bonds and offers a central pad patterned with a photonic crystal. This allows to reach an optical reflectivity above 80% for efficient coupling to out‐of‐plane light. The presented results pave the way for quantum optoelectromechanical devices at room temperature based on tensile‐strained AlN.

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Cavity Optomechanical Bistability with an Ultrahigh Reflectivity Photonic Crystal Membrane

Zhou,

Bao,

Gorman

et al. 2023

Laser & Photonics Reviews

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Photonic crystal (PhC) membranes patterned with sub‐wavelength periods offer a unique combination of high reflectivity, low mass, and high mechanical quality factor. Using a PhC membrane as one mirror of a Fabry–Perot cavity, a finesse as high as is demonstrated, corresponding to a record high PhC reflectivity of and an optical quality factor of . The fundamental mechanical frequency is 426 kHz, more than twice the optical linewidth, placing it firmly in the resolved‐sideband regime required for ground‐state optical cooling. The mechanical quality factor in vacuum is , allowing values of the single‐photon cooperativity as high as . Optomechanical bistability is easily observed as hysteresis in the cavity transmission. As the input power is raised well beyond the bistability threshold, dynamical backaction induces strong mechanical oscillation above 1 MHz, even in the presence of air damping. This platform will facilitate advances in optomechanics, precision sensing, and applications of optomechanically‐induced bistability.

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Phononically shielded photonic-crystal mirror membranes for cavity quantum optomechanics

Cited by 11 publications

References 41 publications

Quasibound states in the continuum in photonic crystal based optomechanical microcavities

Quasibound states in the continuum in photonic crystal based optomechanical microcavities

Nanomechanical Crystalline AlN Resonators with High Quality Factors for Quantum Optoelectromechanics

Cavity Optomechanical Bistability with an Ultrahigh Reflectivity Photonic Crystal Membrane

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