Near-Field Integration of a SiN Nanobeam and a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>SiO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>Microcavity for Heisenberg-Limited Displacement Sensing

Schilling, Ryan; Schütz, Hendrik; Ghadimi, Amir H.; Sudhir, V.; Wilson, Dalziel J.; Kippenberg, Tobias J.

doi:10.1103/physrevapplied.5.054019

Cited by 64 publications

(61 citation statements)

References 86 publications

(181 reference statements)

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“…In our experiment we monitor the position fluctuations of a cryogenically pre-cooled (T ≈ 6 K) nanomechanical string coupled dispersively to an optical microcavity [167]. The fundamental mode of the string forms the oscillator (frequency Ω m = 2π · 4.3 MHz, damping rate Γ m = 2π · 7 Hz).…”

Section: Resultsmentioning

confidence: 99%

“…Specifically, the mechanical oscillator possessing an exceptionally high Q/(mass) ratio and low optical absorption [167], while the optical cavity possessing a high Q/(mode volume) ratio and low optical nonlinearity. As discussed in section 2.2.3, coupling is achieved by carefully localising a portion of the beam within the evanescent volume of one of the microdisk's whispering gallery modes.…”

Section: Measurement At the Thermal Decoherence Ratementioning

confidence: 99%

“…Care is taken to ensure that the tapered fiber predominantly [167]. (d) Schematic of waveguide (here, tapered optical fiber) coupling to a whispering gallery mode cavity.…”

Section: Optical Cavity Coupled To a Waveguidementioning

confidence: 99%

“…where the approximation parametrises the coupling rate in terms of an effective optical volume of the disk (beam), V disk(beam),opt ,given by the optical energy in the disk (beam) normalised to the maximum electric field intensity in the disk (beam), i.e., In practice, the evanescent length ev , the mode cross-section A disk , and the geometric pre-factor α need to be determined from a numerical solution of Maxwell's equations [167]. A simple estimate may however be made by replacing these parameters using known approximations for the case of a toroidal cavity [49]: the evanescent length ev ≈ λ c /12, while the mode cross-section A disk ≈ 0.15 · r 7/12 disk t 1/4 disk λ 7/6 c and the geometric pre-factor, α ≈ 1.1(λ c /r disk ) 1/3 .…”

Section: 3)mentioning

confidence: 99%

“…The devices used in this thesis, while nominally similar to fig. 2.13b, are based on a vastly improved fabrication procedure [167] capable of placing the nanobeam at the optimal position in the evanescent optical field so as to maximise the gradient force. Future theses from the group will discuss the fabrication process in depth, see [167] for details.…”

Section: Stressed Nanostring Coupled To An Optical Microcavitymentioning

confidence: 99%

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Quantum Limits on Measurement and Control of a Mechanical Oscillator

Sudhir

2018

Springer Theses

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PAR Vivishek SUDHIR JOSEPH CONRAD, Heart of DarknessExperimental physics demands a certain degree of manual dexterity, the patience to tolerate the mundane, and an inexhaustible supply of optimism. Tobias hired me to work on an immensely sophisticated experiment despite any proof of my possessing these qualities; I am indebted to him for the belief he has placed in me. I would also like to acknowledge his dedication to fostering an environment where the pursuit of science is unencumbered by other worldly concerns. Stefan, Ewold and Samuel bore the brunt of a theorist trying to perform delicate experiments; the stern, yet encouraging, stewardship of this trio ensured that I enjoyed the culture shock. Dal Wilson was more than a colleague and a post-doc; his pragmatic approach to physics provided the ideal counter-point in our attempts to forge a deeper understanding of things ranging from vibration isolation to the subtleties of quantum mechanics. Without the patient efforts of Amir, Ryan and Hendrik in designing, fabricating, and testing of devices, none of the results reported here would have been possible. I hope I have been able to bequeath a better vision of the future of our experiment to Sergey. Conversations with Alexey, Daniel and Nathan have enabled me to vicariously learn how to measure microwave "photons". John Jost once taught me how to decorate a Christmas tree; since then he has imparted some wisdom on frequency metrology, and some on atomic physics. Together with Dal, Victor and Caroline have probably spent the most time with me outside the lab; it was fun to exercise an air of social normalcy with this bunch. Christophe has been an amazing sparring partner on every subject capable of being brought under scientific scrutiny.The personal space required for the pursuit of science comes through the sacrifice of many people. My family back home in India -parents, sister, grand-parents -have had to patiently wait for the brief interludes when I go home. No words can do justice to this and the very many other pleasures they have surrendered over the years for my sake. Before physics attracted me, I was charmed by someone else; I am lucky to have married her. Long time friends, mentorsAjith and Subeesh -have played pivotal roles in my being able to engage in physics; I hope to repay this enormous debt, some day.It was a privilege to have learnt from a few great teachers during my formative years. Their vision of an indelible unity in nature continues to motivate my study of physics. vii AbstractThe precision measurement of position has a long-standing tradition in physics. Cavendish's verification of the universal law of gravitation using a torsion pendulum, Perrin's confirmation of the atomic hypothesis via the precise measurement of the Brownian motion, and, the verification of the mechanical effect of electromagnetic radiation, all belong to this classical heritage. Quantum mechanics posits that the measurement of position results in an uncertain momentum; an idea developed to full maturity within the ...

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Section: Resultsmentioning

confidence: 99%

Section: Measurement At the Thermal Decoherence Ratementioning

confidence: 99%

“…Care is taken to ensure that the tapered fiber predominantly [167]. (d) Schematic of waveguide (here, tapered optical fiber) coupling to a whispering gallery mode cavity.…”

Section: Optical Cavity Coupled To a Waveguidementioning

confidence: 99%

Section: 3)mentioning

confidence: 99%

Section: Stressed Nanostring Coupled To An Optical Microcavitymentioning

confidence: 99%

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Quantum Limits on Measurement and Control of a Mechanical Oscillator

Sudhir

2018

Springer Theses

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Optical Microresonators for Sensing and Transduction: A Materials Perspective

et al. 2017

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Optical microresonators confine light to a particular microscale trajectory, are exquisitely sensitive to their microenvironment, and offer convenient readout of their optical properties. Taken together, this is an immensely attractive combination that makes optical microresonators highly effective as sensors and transducers. Meanwhile, advances in material science, fabrication techniques, and photonic sensing strategies endow optical microresonators with new functionalities, unique transduction mechanisms, and in some cases, unparalleled sensitivities. In this progress report, the operating principles of these sensors are reviewed, and different methods of signal transduction are evaluated. Examples are shown of how choice of materials must be suited to the analyte, and how innovations in fabrication and sensing are coupled together in a mutually reinforcing cycle. A tremendously broad range of capabilities of microresonator sensors is described, from electric and magnetic field sensing to mechanical sensing, from single-molecule detection to imaging and spectroscopy, from operation at high vacuum to in live cells. Emerging sensing capabilities are highlighted and put into context in the field. Future directions are imagined, where the diverse capabilities laid out are combined and advances in scalability and integration are implemented, leading to the creation of a sensor unparalleled in sensitivity and information content.

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Microfluidic Whispering Gallery Mode Optical Sensors for Biological Applications

Wang

Zeng

Humbert

et al. 2020

Laser & Photonics Reviews

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Whispering gallery mode (WGM) resonators have been exploited as a highly sensitive and efficient sensing technique in the past few years. They offer the advantages of ultrahigh sensitivity, compact size, and label-free sensing capability. More recently, with the rapid development of microfluidic technologies, many integrated WGM sensors, by combining the portability of lab-on-chip devices and the high sensitivity of WGM resonators, have emerged. The capabilities of efficient sample handling and multiplexed analyte detection offered by these systems have led to many biological and chemical sensing applications, especially for the detection of single particle or biomolecule. In this review, different sensing mechanisms based on integrated whispering gallery mode resonators are introduced. Various geometries of WGM cavities including solid, liquid, and hollow resonators and a detailed discussion on their integration with microfluidic devices are also covered. Different types of packaging schemes and integration methods are compared in terms of ease of fabrication and device performance. Finally, recent applications of microfluidic-based WGM sensors for detecting biological and chemical target molecules are discussed, with a prospect on future challenges and trends of development in microfluidics for multiplexed detection.

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Near-Field Integration of a SiN Nanobeam and aSiO2Microcavity for Heisenberg-Limited Displacement Sensing

Cited by 64 publications

References 86 publications

Quantum Limits on Measurement and Control of a Mechanical Oscillator

Quantum Limits on Measurement and Control of a Mechanical Oscillator

Optical Microresonators for Sensing and Transduction: A Materials Perspective

Microfluidic Whispering Gallery Mode Optical Sensors for Biological Applications

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