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Integrated III-V Photonic Crystal--Si waveguide platform with tailored optomechanical coupling.

Tsvirkun V, Surrente A, Raineri F, Beaudoin G, Raj R, Sagnes I, Robert-Philip I, Braive R - Sci Rep (2015)

Bottom Line: Optomechanical systems, in which the vibrations of a mechanical resonator are coupled to an electromagnetic radiation, have permitted the investigation of a wealth of novel physical effects.To fully exploit these phenomena in realistic circuits and to achieve different functionalities on a single chip, the integration of optomechanical resonators is mandatory.This scalable platform allows for an unprecedented control on the optomechanical coupling mechanisms, with a potential benefit in cooling experiments, and for the development of multi-element optomechanical circuits in the framework of optomechanically-driven signal-processing applications.

View Article: PubMed Central - PubMed

Affiliation: Laboratoire de Photonique et Nanostructures LPN-CNRS UPR-20, Route de Nozay, 91460 Marcoussis, France.

ABSTRACT
Optomechanical systems, in which the vibrations of a mechanical resonator are coupled to an electromagnetic radiation, have permitted the investigation of a wealth of novel physical effects. To fully exploit these phenomena in realistic circuits and to achieve different functionalities on a single chip, the integration of optomechanical resonators is mandatory. Here, we propose a novel approach to heterogeneously integrate arrays of two-dimensional photonic crystal defect cavities on top of silicon-on-insulator waveguides. The optomechanical response of these devices is investigated and evidences an optomechanical coupling involving both dispersive and dissipative mechanisms. By controlling the optical coupling between the waveguide and the photonic crystal, we were able to vary and understand the relative strength of these couplings. This scalable platform allows for an unprecedented control on the optomechanical coupling mechanisms, with a potential benefit in cooling experiments, and for the development of multi-element optomechanical circuits in the framework of optomechanically-driven signal-processing applications.

No MeSH data available.


Related in: MedlinePlus

Optomechanical response for a varying wwg.(a,c,e) Power spectral densities at mechanical resonance (circles: experimental data; solid lines: fit to model) SP(Ωm, Δ/κ) and (b,d,f) relative contributions of coupling dispersive (blue curves) and dissipative (orange curves: intrinsic; yellow curves: external) coupling mechanisms (arbitrary units). (a,b) wwg = 350 nm. (c,d) wwg = 450 nm. (e,f) wwg = 500 nm.
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f3: Optomechanical response for a varying wwg.(a,c,e) Power spectral densities at mechanical resonance (circles: experimental data; solid lines: fit to model) SP(Ωm, Δ/κ) and (b,d,f) relative contributions of coupling dispersive (blue curves) and dissipative (orange curves: intrinsic; yellow curves: external) coupling mechanisms (arbitrary units). (a,b) wwg = 350 nm. (c,d) wwg = 450 nm. (e,f) wwg = 500 nm.

Mentions: The flexibility of the sample design permitted by our integrated approach enables us to investigate in detail the variation of the optomechanical coupling mechanisms as a function of the waveguide width wwg, while keeping the membrane suspension height h constant. In Fig. 3(a,c,e) we illustrate the dependence of the transduction of optomechanical resonators on the waveguide width, for wwg = 350 nm, 450 nm, and 500 nm, respectively. In all cases, the strong non-zero optomechanical signal at the optical resonance confirms the importance of the dissipative coupling mechanism for our optomechanical resonators. However, the relative weight of the different coupling mechanisms varies as a function of wwg. In particular, Fig. 3(b,d,f) reveal a comparatively higher dispersive component for both wwg = 350 nm and wwg = 500 nm. Conversely, wwg = 450 nm is characterized by the highest dissipative contribution to the detected signal, as attested by the mechanical amplitude peaking at zero laser detuning. Our fits also suggest a certain variability of κi as a function of wwg, which we attribute to defects introduced during the epitaxial growth or during the fabrication process of the optomechanical resonators.


Integrated III-V Photonic Crystal--Si waveguide platform with tailored optomechanical coupling.

Tsvirkun V, Surrente A, Raineri F, Beaudoin G, Raj R, Sagnes I, Robert-Philip I, Braive R - Sci Rep (2015)

Optomechanical response for a varying wwg.(a,c,e) Power spectral densities at mechanical resonance (circles: experimental data; solid lines: fit to model) SP(Ωm, Δ/κ) and (b,d,f) relative contributions of coupling dispersive (blue curves) and dissipative (orange curves: intrinsic; yellow curves: external) coupling mechanisms (arbitrary units). (a,b) wwg = 350 nm. (c,d) wwg = 450 nm. (e,f) wwg = 500 nm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4644963&req=5

f3: Optomechanical response for a varying wwg.(a,c,e) Power spectral densities at mechanical resonance (circles: experimental data; solid lines: fit to model) SP(Ωm, Δ/κ) and (b,d,f) relative contributions of coupling dispersive (blue curves) and dissipative (orange curves: intrinsic; yellow curves: external) coupling mechanisms (arbitrary units). (a,b) wwg = 350 nm. (c,d) wwg = 450 nm. (e,f) wwg = 500 nm.
Mentions: The flexibility of the sample design permitted by our integrated approach enables us to investigate in detail the variation of the optomechanical coupling mechanisms as a function of the waveguide width wwg, while keeping the membrane suspension height h constant. In Fig. 3(a,c,e) we illustrate the dependence of the transduction of optomechanical resonators on the waveguide width, for wwg = 350 nm, 450 nm, and 500 nm, respectively. In all cases, the strong non-zero optomechanical signal at the optical resonance confirms the importance of the dissipative coupling mechanism for our optomechanical resonators. However, the relative weight of the different coupling mechanisms varies as a function of wwg. In particular, Fig. 3(b,d,f) reveal a comparatively higher dispersive component for both wwg = 350 nm and wwg = 500 nm. Conversely, wwg = 450 nm is characterized by the highest dissipative contribution to the detected signal, as attested by the mechanical amplitude peaking at zero laser detuning. Our fits also suggest a certain variability of κi as a function of wwg, which we attribute to defects introduced during the epitaxial growth or during the fabrication process of the optomechanical resonators.

Bottom Line: Optomechanical systems, in which the vibrations of a mechanical resonator are coupled to an electromagnetic radiation, have permitted the investigation of a wealth of novel physical effects.To fully exploit these phenomena in realistic circuits and to achieve different functionalities on a single chip, the integration of optomechanical resonators is mandatory.This scalable platform allows for an unprecedented control on the optomechanical coupling mechanisms, with a potential benefit in cooling experiments, and for the development of multi-element optomechanical circuits in the framework of optomechanically-driven signal-processing applications.

View Article: PubMed Central - PubMed

Affiliation: Laboratoire de Photonique et Nanostructures LPN-CNRS UPR-20, Route de Nozay, 91460 Marcoussis, France.

ABSTRACT
Optomechanical systems, in which the vibrations of a mechanical resonator are coupled to an electromagnetic radiation, have permitted the investigation of a wealth of novel physical effects. To fully exploit these phenomena in realistic circuits and to achieve different functionalities on a single chip, the integration of optomechanical resonators is mandatory. Here, we propose a novel approach to heterogeneously integrate arrays of two-dimensional photonic crystal defect cavities on top of silicon-on-insulator waveguides. The optomechanical response of these devices is investigated and evidences an optomechanical coupling involving both dispersive and dissipative mechanisms. By controlling the optical coupling between the waveguide and the photonic crystal, we were able to vary and understand the relative strength of these couplings. This scalable platform allows for an unprecedented control on the optomechanical coupling mechanisms, with a potential benefit in cooling experiments, and for the development of multi-element optomechanical circuits in the framework of optomechanically-driven signal-processing applications.

No MeSH data available.


Related in: MedlinePlus