Abstract:Abstract:We report modal phase matched (MPM) second harmonic generation (SHG) in high-index contrast AlGaAs sub-micron ridge waveguides, by way of sub-mW continuous wave powers at telecommunication wavelengths. We achieve an experimental normalized conversion efficiency of ~14%/W/cm 2 , obtained through a careful subwavelength design supporting both the phase matching requirement and a significant overlap efficiency. Furthermore, the weak anomalous dispersion, robust fabrication technology and possible geometr… Show more
“…It is worth mentioning that we also observed efficient SHG in AlGaAs photonics wires [72], as well as efficient self-phase modulation [49], supercontinuum generation [59], and FWM in Hydex® spiral waveguides, which we did not discuss in this review due to space limitations.…”
Section: Discussionmentioning
confidence: 95%
“…As such, several waveguide structures have been developed so far by many groups in order to achieve it in AlGaAs waveguides. These include multilayer AlGaAs/Al 2 O 3 waveguides for artificial form birefringence phase matching (FBPM) [69,70], engineered-waveguides for modal phase matching (MPM) [71,72], Bragg reflection waveguides (BRW) for MPM [73], orientation patterned GaAs (OP-GaAs) for quasi-phase matching (QPM) via domain reversal [74], and periodically switching nonlinearity (PSN) via etch-and-regrowth for QPM [75]. A comprehensive discussion of these techniques may be found in Ref.…”
We review our recent progresses on frequency conversion in integrated devices, focusing primarily on experiments based on strip-loaded and quantum-well intermixed AlGaAs waveguides, and on CMOS-compatible high-index doped silica glass waveguides. The former includes both second-and third-order interactions, demonstrating wavelength 2 conversion by tunable difference-frequency generation over a bandwidth of more than 100 nm, as well as broadband self-phase modulation and tunable four-wave mixing. The latter includes four-wave mixing using low-power continuous-wave light in microring resonators as well as hyper-parametric oscillation in a high quality factor resonator, towards the realization of an integrated multiple wavelength source with important applications for telecommunications, spectroscopy, and metrology.
“…It is worth mentioning that we also observed efficient SHG in AlGaAs photonics wires [72], as well as efficient self-phase modulation [49], supercontinuum generation [59], and FWM in Hydex® spiral waveguides, which we did not discuss in this review due to space limitations.…”
Section: Discussionmentioning
confidence: 95%
“…As such, several waveguide structures have been developed so far by many groups in order to achieve it in AlGaAs waveguides. These include multilayer AlGaAs/Al 2 O 3 waveguides for artificial form birefringence phase matching (FBPM) [69,70], engineered-waveguides for modal phase matching (MPM) [71,72], Bragg reflection waveguides (BRW) for MPM [73], orientation patterned GaAs (OP-GaAs) for quasi-phase matching (QPM) via domain reversal [74], and periodically switching nonlinearity (PSN) via etch-and-regrowth for QPM [75]. A comprehensive discussion of these techniques may be found in Ref.…”
We review our recent progresses on frequency conversion in integrated devices, focusing primarily on experiments based on strip-loaded and quantum-well intermixed AlGaAs waveguides, and on CMOS-compatible high-index doped silica glass waveguides. The former includes both second-and third-order interactions, demonstrating wavelength 2 conversion by tunable difference-frequency generation over a bandwidth of more than 100 nm, as well as broadband self-phase modulation and tunable four-wave mixing. The latter includes four-wave mixing using low-power continuous-wave light in microring resonators as well as hyper-parametric oscillation in a high quality factor resonator, towards the realization of an integrated multiple wavelength source with important applications for telecommunications, spectroscopy, and metrology.
“…Experimental results on modal phase-matched SHG in AlGaAs nanowaveguides, achieved using CW light source operating at the telecom wavelengths, have been reported in Ref. [26].…”
In this paper, we investigate semiconductor nanowaveguides (i.e. ridge waveguides with core-widths narrower than 1 µm) intended to act as novel optical light sources through nonlinear wavelength/frequency conversion. In particular, numerical calculations have been performed in order to design suitable photonic devices (fabricated in the AlGaAs/GaAs platform) capable of high efficiency second harmonic generation. Particular interest has been dedicated to the effective conversion of optical signals from 1520-1600 nm (the third telecom window) down to 760-800 nm. We demonstrate that the output wavelength (resulting from modal phase-matching) can be dynamically tuned by proper adjustment of the temperature and/or geometrical parameters of the waveguides. In addition, by changing the waveguide width it is also possible to modify the device dispersion characteristics, giving the possibility to work in the region of anomalous dispersion and thus allowing for the generation of temporal solitons.
“…These structures can be integrated with both active and passive photonic components. Various strategies have been developed to achieve phase matching (PM) in AlGaAs waveguides [14,15]: QPM [16][17][18], form birefringence [19,20], modal phase matching (MPM) [21], counterpropagating modes [22], and the use of Bragg reflection waveguides (BRWs) [23,24]. Techniques to generate polarization entangled photons in AlGaAs waveguides have been theoretically developed [25][26][27] as well as experimentally demonstrated [22,28,29].…”
We propose and analyze the performance of a technique to generate mode and polarization hyperentangled photons in monolithic semiconductor waveguides using two concurrent type-II spontaneous parametric downconversion (SPDC) processes. These two SPDC processes are achieved by waveguide engineering which allows for simultaneous modal phase matching with the pump beam in a higher-order mode. Paired photons generated in each process are cross polarized and guided by different guiding mechanisms, which produces entanglement in both polarization and spatial mode. Theoretical analysis shows that the output quantum state has a high quality of hyperentanglement by spectral filtering with a bandwidth of a few nanometers, while off-chip compensation is not needed. This technique offers a path to realize an electrically pumped hyperentangled photon source.
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