Abstract Optical nonlinearities, such as thermo-optic mechanisms and free-carrier dispersion, are often considered unwelcome effects in silicon-based resonators and, more specifically, optomechanical cavities, since they affect, for instance, the relative detuning between an optical resonance excitation laser. Here, we exploit these nonlinearities their intercoupling with mechanical degrees of freedom a silicon nanobeam to unveil rich set fundamentally different complex dynamics. By smoothly...

We report an experimental study of porous silicon-based rugate filters. performed filter apodization, following a half-apodization approach, which successfully attenuated the sidelobes at both sides photonic stop band. achieved successful reduction interference ripples through insertion index-matching layers on first and last interfaces. An apodized dielectric mirror are compared: Appreciable differences in harmonic presence stop-band performance were observed commented on. Bandwidth control...

The synchronization of coupled oscillators is a phenomenon found throughout nature. Mechanical are paradigmatic examples, but synchronizing their nanoscaled versions challenging. We report the mechanical dynamics pair optomechanical crystal cavities that, in contrast to previous works performed similar objects, intercoupled with link and support independent optical modes. In this regime they oscillate antiphase, which agreement predictions our numerical model that considers reactive...

Multimode cavity optomechanics, where multiple mechanical degrees of freedom couple to optical modes, provides a rich platform for exploring nonlinear dynamics and engineering complex interactions. In this work, we investigate the interplay between two modes with similar characteristics self-induced modulation intra-cavity power (self-pulsing) driven by free-carrier dispersion thermo-optic effects in silicon. Notably, self-pulsing adapts optomechanically induced perturbations from both...

We report a novel injection scheme that allows for "phonon lasing" in one-dimensional opto-mechanical photonic crystal, sideband unresolved regime and with cooperativity values as low 10(-2). It extracts energy from cw infrared laser source is based on the triggering of thermo-optical/free-carrier-dispersion self-pulsing limit-cycle, which anharmonically modulates radiation pressure force. The large amplitude coherent mechanical motion acts feedback stabilizes entrains oscillations to simple...

The resonant enhancement of mechanical and optical interaction in optomechanical cavities enables their use as extremely sensitive displacement force detectors. In this Letter, we demonstrate a hybrid magnetometer that exploits the coupling between excitation spin waves ferromagnetic insulator breathing modes glass microsphere deposited on top. is mediated by magnetostriction material consequent driving microsphere. response thus relies spectral overlap resonance sphere, leading to peak...

Abstract Spontaneous locking of the phase a coherent phonon source to an external reference is demonstrated in deeply sideband-unresolved optomechanical system. The high-amplitude mechanical oscillations are driven by anharmonic modulation radiation pressure force that result from absorption-mediated free-carrier/temperature limit cycle, i.e., self-pulsing. Synchronization observed when pump laser driving oscillator self-sustained state modulated radiofrequency tone. We employ pump-probe...

Nanomechanical resonators can serve as ultrasensitive, miniaturized force probes. While vertical structures such nanopillars are ideal for this purpose, transducing their motion is challenging. Pillar-based photonic crystals (PhCs) offer a potential solution by integrating optical transduction within the pillars. However, achieving high-quality PhCs hindered inefficient light confinement. Here, we present full-silicon crystal cavity based on platform applications in sensing and biosensing...

We report an experimental study of porous silicon-based rugate filters. Possible optimisations that can improve different features the filters are investigated. demonstrate sidelobe attenuation by means half-apodization structures with a sinusoidal window. Reduction interference ripples experimentally observed through insertion index-matching layers on boundaries structure. The superposition two designs to obtain multi-stop-band filter is also demonstrated. show possibility controlling...

Whispering-gallery modes (WGMs) on Nd3+-doped glass microspheres with a radius of ∼15 μm were measured in modified confocal microscope, where dual spatial resolution both excitation and detection zones was possible. As an alternative to the standard mechanism by evanescent wave, we used efficient pumping/detecting scheme, focusing laser microsphere exciting Nd3+ ions, whose fluorescent emission produces WGMs. We have also generated WGMs changing zone, higher amplitude resonances found when...

Hybrid organic-inorganic monomode waveguides of conjugated polymers on porous silicon (PS) substrates have been fabricated. Different low refractive index PS substrates, varying from 1.46 down to 1.18 studied. Amplified spontaneous emission (ASE) has observed for all the samples and ASE threshold monitored as a function index. A decrease in is detected when decreases. These results analysed frame four level waveguide amplifier model theoretical predictions are agreement with experimental data.

We report on the optomechanical properties of a breathing mechanical mode oscillating at 5.5 GHz in 1D corrugated Si nanobeam. This has an experimental single-particle coupling rate |go,OM| = 1.8 MHz (|go,OM|/2π 0.3 MHz) and shows strong dynamical back-action effects room temperature. The geometrical flexibility unit-cell would lend itself to further engineering cavity region localize within full phononic band-gap present 4 while keeping high go,OM values. lead longer lifetimes cryogenic...

Electrical conductivity of porous silicon fabricated form heavily doped p-type is very sensitive to NO$_2$, even at concentrations below 100 ppb. However, sensitivity strongly depends on the microstructure. The structural difference between and insensitive samples independently confirmed by microscopy images light scattering behavior. A way change structure modifying composition electrochemical solution. We have found that best results are achieved using ethanoic solutions with HF...

Positive transient optical gain has been demonstrated in Ho3+-doped transparent oxyfluoride glass-ceramics. A pump and probe experiment designed to show this result. High power laser pulses at 532nm were used as the source strongly populate Ho3+S25:F45 level due nonresonant ground state absorption. Low cw radiation 750nm was beam. The signal beam stimulates emission associated with Ho3+S25:F45→I75 electronic transition 750nm. In addition this, high provide population inversion between...

Positive optical gain under pulsed excitation in oxidized porous silicon planar waveguides impregnated with Nile blue (LC 6900) is reported. Amplified spontaneous emission measurements show a dramatic line narrowing when the pump energy increased, together strong superlinear behavior. Variable stripe length were performed to characterize quantitatively amplification, and an unambiguous transition from losses observed threshold of ∼3mJ∕cm2 at 700nm. A maximum coefficient 8.7cm−1 (∼40dB∕cm)...

Optical forces can set tiny objects in states of mechanical self-sustained oscillation, spontaneously generating periodic signals by extracting power from steady sources. Miniaturized coherent phonon sources are interesting for applications such as mass-force sensing, intra-chip metrology and time-keeping among others. In this paper, we review several mechanisms techniques that drive a mode into the lasing regime exploiting radiation pressure force optomechanical cavities, namely stimulated...

Silicon on insulator photonics has offered a versatile platform for the recent development of integrated optomechanical circuits. However, there are some constraints such as high cost wafers and limitation to single physical device level. In present work we investigate nanocrystalline silicon an alternative material devices. particular, demonstrate that crystal cavities fabricated have optical mechanical properties enabling non-linear dynamical behaviour effects...

Laser action using non-coupled excitation and detection of microspheres made Nd 3+ doped barium-titanium-silicate glass has been demonstrated measured.The have also successfully deposited over Si 3 N 4 strip waveguides with a SiO 2 separation layer, thus enabling the laser emission extraction onto CMOS compatible photonic circuit.The dynamics lasing wavelength intensity studied as function pump power interpreted in terms thermal effects generated through non-radiative recombination excited ions.

Optomechanical structures are well suited to study photon-phonon interactions, and they also turn out be potential building blocks for phononic circuits quantum computing. In circuits, in which information is carried processed by phonons, optomechanical could used as interfaces photons electrons thanks their excellent coupling efficiency. Among the components required such create coherent phonon sources detectors. Complex functions other than emission or detection remain challenging...

Optomechanical crystal cavities (OMC) have rich perspectives for detecting and indirectly analysing biological particles, such as proteins, bacteria viruses. In this work we demonstrate the working principle of OMCs operating under ambient conditions a sensor submicrometer particles by optically monitoring frequency shift thermally activated mechanical modes. The resonator has been specifically designed so that cavity region supports particular family low modal-volume modes, commonly known...