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Dissipative Kerr-cavity temporal Solitons (DKS) are self-localized light pulses that can be excited in coherently-driven nonlinear optical resonators [1], enabling compact, coherent optical Kerr Frequency Combs (KFC) generation, which have numerous potential applications. Numerical studies based on the Lugiato-Lefever Equation (LLE) predicted that DKS can undergo breathing, i.e. periodic variations...
Integrated microresonators based on SiN waveguides are an attractive platform for nonlinear optics. Here we present a new photonic Damascene fabrication process that solves common problems in SiN waveguide fabrication and demonstrate frequency comb formation.
We show for the first time a fully coherent frequency comb generated in a SiN photonic chip which spans 2/3 of an octave using solitons and soliton induced Cherenkov radiation. Additionally we stabilize the spectrum.
Mid-infrared frequency comb generation in ultra high Q crystalline micro resonators are presented. Progress on fabrication of both crystalline resonators and silicon nitride micro cavities are reported.
Using a high-Q Kerr-nonlinear SiN microresonator as a frequency comb source we generate a 1.44 Tbit/s (20×18 GBd PDM-QPSK) data stream and transmit it over 300 km. The comb is stabilized by a feedback control.
We investigate optomechanical effects in photonic crystal slab membranes, either including a cavity or acting as an end-mirror in a Fabry-Perot cavity. We in particular demonstrate the non-linear behavior of the membranes fundamental mode.
Nanomechanical oscillators are at the heart of a variety of precision measurements. This article reports on dispersive radiation coupling of nanomechanical oscillators to the evanescent near-field of toroid optical microresonators. The optomechanical coupling coefficient which reaches values >200 MHz/nm, corresponding to a vacuum optomechanical coupling rate >4 kHz, is characterized in detail...
Atoms (and molecules) with a well-suited energy level structure can be rendered transparent to a light beam they would usually absorb by the presence of a “control” laser beam. This “electromagnetically induced transparency” (EIT) [1] can be understood as a consequence of quantum interference of different excitation pathways of the atom by the probing beam. Strong optical dispersion concomitant with...
Cavity optomechanics exploits the coupling of mechanical oscillators to the light field via radiation pressure [1]. Recently, optomechanical coupling in 1D photonic crystal cavities has been observed in patterned single [2] and dual nanobeams (zipper cavities) [3]. Here we study [4] optomechanical coupling in a conventional photonic crystal defect cavity (L3). On the fundamental side, this device...
High-Q whispering gallery resonators, such as silica microspheres or microtoroids on a chip, have been successfully employed as optical biosensors [1]. Due to a high effective interaction length and a small mode volume, the resonance frequency is susceptible to small variations of the refractive index (RI). In particular, the observation of reactive wavelength shifts resulting from the adsorption...
We present an optomechanical displacement transducer that relies on three cavity modes parametrically coupled to a mechanical oscillator and whose frequency spacing matches the mechanical resonance frequency. The additional resonances allow us to reach the standard quantum limit at a substantially lower input power (compared to the case of only one resonance), as both sensitivity and quantum backaction...
Using resolved-sideband laser cooling, a micromechanical oscillator is cooled to an average occupation of 63 quanta, and simultaneously measured close to the limit imposed by the Heisenberg uncertainty principle.
Optical gradient fields have been successfully used in various areas, e.g. as optical tweezers. Recently, evanescent fields were employed to sense nanomechanical motion. Enhancing the optomechanical coupling via a cavity offers significantly higher sensitivities. More importantly, cavity retardation effects can render the back-action which any linear position measurement must entail dynamical. We...
Exploring quantum effects in mesoscopic mechanical oscillators as palpable as a pendulum or a cantilever has been a subject of long-standing interest in Quantum Physics and in the context of gravitational wave detection, and has recently - within the setting of cavity optomechanics - received significant interest. Studying non-classical aspects however requires the ability to both prepare and probe...
This work shows independent control over both optical and mechanical degrees of freedom in the microscale optomechanical resonator. Studying the dissipation of different mechanical modes of silica microtoroids it was possible to directly observe mechanical normal mode splitting between different modes of a micromechanical system. The fundamental radial breathing mode (RBM) can couple to flexural modes...
The quest for observing the zero point fluctuations of a macroscopic mechanical oscillator is one of the major objectives in modern optomechanics. If optical cooling techniques have recently allowed to actively cool down various macroscopic oscillators (micro-mirrors, toroidal micro-cavities, membranes or gram scale mirrors), they still have to be combined with standard cryogenic environment to lower...
We present a versatile approach that allows for both precise and broadband measurements of transmission spectra by transferring the precision of an optical frequency comb to a mode-hop free tunable external cavity diode laser. The advantage of using a tunable diode laser compared to other methods such as direct frequency comb spectroscopy or multi-heterodyne spectroscopy is the ability to resolve...
In this paper, the authors report on the first experimental detection of optomechanical interactions in a crystalline CaF2 whispering gallery mode (WGM) resonator, possessing both, high optical and mechanical quality factor. Using tapered optical fibers, coupling close to the condition of critical coupling is achieved. In these first measurements, the highest optical quality factor was 108. In order...
We show that evanescent fields of microresonators can be employed for cavity-enhanced high-sensitivity monitoring of nanomechanical motion. This novel scheme opens the path to observing backaction effects using optical gradient forces in the resolved-sideband regime.
We present a simple method that enables fast, broadband spectroscopy at sub-Megahertz resolution over >4 THz bandwidth using a mode-hop-free tunable diode laser and a frequency comb. This scheme is utilized to measure microresonator dispersion.
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