Photothermal tuning and stabilization of a photonic crystal nanofiber cavity

Wang, Jie; Nayak, K. P.; Keloth, Jameesh

doi:10.1364/ol.44.003996

“…Photon absorption and the static optomechanical interaction decreases the optical resonance frequency 42 , which results in optical bistability for sufficiently large photon numbers 38 . This directly limits the achievable quantum cooperativity 9,[44][45][46] . By introducing the additional clamping tethers on the photonic crystal, we also increase the thermal anchoring to the environment and show that it is possible to achieve large n cav before entering the bistability regime.…”

Section: Resultsmentioning

confidence: 99%

Integrated optical-readout of a high-Q mechanical out-of-plane mode

Guo

¹

,

Gröblacher

²

2022

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The rapid development of high-QM macroscopic mechanical resonators has enabled great advances in optomechanics. Further improvements could allow for quantum-limited or quantum-enhanced applications at ambient temperature. Some of the remaining challenges include the integration of high-QM structures on a chip, while simultaneously achieving large coupling strengths through an optical read-out. Here, we present a versatile fabrication method, which allows us to build fully integrated optomechanical structures. We place a photonic crystal cavity directly above a mechanical resonator with high-QM fundamental out-of-plane mode, separated by a small gap. The highly confined optical field has a large overlap with the mechanical mode, enabling strong optomechanical interaction strengths. Furthermore, we implement a novel photonic crystal design, which allows for a very large cavity photon number, a highly important feature for optomechanical experiments and sensor applications. Our versatile approach is not limited to our particular design but allows for integrating an out-of-plane optical read-out into almost any device layout. Additionally, it can be scaled to large arrays and paves the way to realizing quantum experiments and applications with mechanical resonators based on high-QM out-of-plane modes alike.

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“…The system would not come back to the original state with any further perturbations. To avoid this instability, it has been proposed to always work at an optical wavelength where multiple values for ∆ are not possible [41]. However, as this is in the blue-detuned regime, it can lead to coherent driving and heating of the mechanical resonator, and the system becomes unstable again when a high Q M mechanical resonator is involved.…”

Section: Optical Bistabilitymentioning

confidence: 99%

“…Photon absorption and the static optomechanical interaction decreases the optical resonance frequency [39], which results in an optical bistability, for sufficiently large photon numbers [34]. This directly limits the achievable quantum cooperativity [9,[40][41][42]. By introducing the additional clamping tethers on the photonic crystal we also increase the thermal anchoring to the environment and show that it is possible to achieve large n cav before entering the bistability regime.…”

mentioning

confidence: 98%

Integrated optical-readout of a high-Q mechanical out-of-plane mode

Guo¹,

Gröblacher²

2022

Preprint

0

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The rapid development of high-QM macroscopic mechanical resonators has enabled great advances in optomechanics. Further improvements could allow for quantum-limited or quantum-enhanced applications at ambient temperature. Some of the remaining challenges include the integration of high-QM structures on a chip, while simultaneously achieving large coupling strengths through an optical read-out. Here, we present a versatile fabrication method, which allows us to build fully integrated optomechanical structures. We place a photonic crystal cavity directly above a mechanical resonator with high-QM fundamental out-of-plane mode, separated by a small gap. The highly confined optical field has a large overlap with the mechanical mode, enabling strong optomechanical interaction strengths. Furthermore, we implement a novel photonic crystal design, which allows for a very large cavity photon number, a highly important feature for optomechanical experiments and sensor applications. Our versatile approach is not limited to our particular design but allows for integrating an out-of-plane optical read-out into almost any device layout. Additionally, it can be scaled to large arrays and paves the way to realizing quantum experiments and applications with mechanical resonators based on high-QM out-of-plane modes alike.

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“…However, in that scheme single atoms are observed in the freespace tweezer and then transported to the nanobeam cavity. Such moving tweezer based trapping scheme may not be suitable for ONF cavities having much narrower linewidths as the tweezer beam itself can induce shift in the cavity resonance due to strong photo-thermal effects [22]. Moreover, the scheme may be seriously affected by the position stability of such a long tapered fiber.…”

Section: Gratings Interference Filters and Filter Cavitiesmentioning

confidence: 99%

Real-Time Observation of Single Atoms Trapped and Interfaced to a Nanofiber Cavity

Nayak

¹

,

Wang

²

,

Keloth

³

2019

Self Cite

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We demonstrate an optical tweezer based single atom trapping on an optical nanofiber cavity. We show that the fluorescence of single atoms trapped on the nanofiber cavity can be readily observed in real-time through the fiber guided modes. The photon correlation measurements further clarify the atom number and the dynamics of the trap. The trap lifetime is measured to be 52±5 ms. From the photon statistics measured for different cavity decay rates, the effective coupling rate of the atom-cavity interface is estimated to be 34±2 MHz. This yields a cooperativity of 5.4±0.6 and a cavity enhanced channeling efficiency of 85±2% for a cavity mode having a linewidth of 164 MHz.These results may open new possibilities for building trapped single atom based quantum interfaces on an all-fiber platform.Realizing an efficient quantum interface will enable deterministic control and readout of the quantum states for quantum information processing [1]. In this context, atomic qubits offer unique capabilities for long coherence time and optical interfacing [1,2]. A recent trend towards optical interfacing is to combine the atomic qubits with nanophotonic platforms and develop hybrid quantum systems, where efficient quantum state-transfer between atoms and photons can be realized.Adiabatically tapered single mode optical fiber with subwavelength diameter waist, referred to as optical nanofiber (ONF), provides a unique fiber-in-line platform for quantum photonics applications [3,4]. The transverse confinement of photonic modes in the ONF has enabled new possibilities for manipulating atom-photon interactions [3][4][5][6]. Furthermore, it has been demonstrated that thousands of atoms can be trapped in the vicinity of the ONF by using guided light in a two-color dipole trap scheme [7][8][9]. This inherently leads to a fiber-in-line optically dense platform for quantum non-linear optics with an ensemble of atoms [10,11].On the other hand, for achieving non-linearity at single atom level, the coupling between the atom and the ONF guided modes can be substantially improved by introducing an in-line fiber cavity. Due to the strong transverse confinement of ONF guided modes, one can achieve strong-coupling regime of cavity quantum electrodynamics (QED) and high single atom cooperativity even for a moderate finesse ONF cavity [12]. A detailed review of various types of ONF cavities, can be found in Ref. [4]. Recently, strong-coupling between a trapped single atom and an ONF cavity has been demonstrated [13]. However, the widely adopted scheme of two-color guided mode trapping of atoms on the ONF [7][8][9][10][11]13], is the only scheme so far and it lacks the control over individual atoms. Preparation of quantum emitters on the ONF cavity, in a bottom-up approach using atomby-atom control may open new possibilities to engineer complex quantum systems. Therefore, development of new trapping schemes for atom-ONF interface is essential.Here, we demonstrate an optical tweezer based sideillumination trapping scheme to trap and interface indi-O...

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Photothermal tuning and stabilization of a photonic crystal nanofiber cavity

Cited by 4 publications

References 13 publications

Integrated optical-readout of a high-Q mechanical out-of-plane mode

Integrated optical-readout of a high-Q mechanical out-of-plane mode

Integrated optical-readout of a high-Q mechanical out-of-plane mode

Real-Time Observation of Single Atoms Trapped and Interfaced to a Nanofiber Cavity

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