Quasi-phase-matching(QPM)has become one of the most common approaches for increasing the efficiency of nonlinear three-wave mixing processes in integrated photonic ***,we provide a study of dispersion engineering of Q...
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Quasi-phase-matching(QPM)has become one of the most common approaches for increasing the efficiency of nonlinear three-wave mixing processes in integrated photonic ***,we provide a study of dispersion engineering of QPM second-harmonic(SH)generation in stoichiometric silicon nitride(Si3 N4)*** apply waveguide design and lithographic control in combination with the all-optical poling technique to study the QPM properties and shape the waveguide dispersion for broadband spectral conversion efficiency inside Si3 N4 *** meeting the requirements for maximal bandwidth of the conversion efficiency spectrum,we demonstrate that group-velocity matching of the pump and SH is simultaneously satisfied,resulting in efficient SH generation from ultrashort optical *** latter is employed for retrieving a carrier-envelope-offset frequency of a frequency comb by using an f-2 f interferometric technique,where supercontinuum and SH of a femtosecond pulse are generated in Si3N4 ***,we show that the waveguide dispersion determines the QPM wavelength variation magnitude and sign due to the thermo-optic effect.
We predict the preservation of temporal indistinguishability of photons propagating through helical coupled-resonator optical waveguides(H-CROWs).H-CROWs exhibit a pseudospin-momentum locked dispersion,which we show s...
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We predict the preservation of temporal indistinguishability of photons propagating through helical coupled-resonator optical waveguides(H-CROWs).H-CROWs exhibit a pseudospin-momentum locked dispersion,which we show suppresscs on-site disorder-induced backscattering and group velocity *** simulate numerically the propagation of two-photon wave packets,demonstrating that they exhibit almost perfect Hong-Ou-Mandel dip visibility and then can preserve their quantum coherence even in the presence of moderate disorder,in contrast with regular CROws,which are highly sensitive to *** indistinguishability is the most fundamental resource of quantum information processing,H-CROWs may find applications for the implementation of robust optical links and delay lines in the emerging quantum photonic communication and computational platforms.
We report supercontinuum generation in nitrogen-rich(N-rich)silicon nitride waveguides fabricated through back-end complementary-metal-oxide-semiconductor(CMOS)-compatible processes on a 300 mm *** pumping in the anom...
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We report supercontinuum generation in nitrogen-rich(N-rich)silicon nitride waveguides fabricated through back-end complementary-metal-oxide-semiconductor(CMOS)-compatible processes on a 300 mm *** pumping in the anomalous dispersion regime at a wavelength of 1200 nm,two-octave spanning spectra covering the visible and near-infrared ranges,including the O band,were *** calculations showed that the nonlinear index of N-rich silicon nitride is within the same order of magnitude as that of stoichiometric silicon nitride,despite the lower silicon content.N-rich silicon nitride then appears to be a promising candidate for nonlinear devices compatible with back-end CMOS processes.
Inspired by insect visual mechanisms, curved bionic compound eyes offer unique advantages in panoramic optoelectronic imaging. However, the limited degree of biomimicry in existing bionic compound eyes structures sign...
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Inspired by insect visual mechanisms, curved bionic compound eyes offer unique advantages in panoramic optoelectronic imaging. However, the limited degree of biomimicry in existing bionic compound eyes structures significantly hinders their practical applications, primarily due to optical crosstalk resulting from the absence of internal waveguides. In this paper, we report a curved bionic compound eyes with integrated inner waveguides capable of minimizing optical crosstalk through an innovative fabrication strategy. By employing curvature-matched focusing lenses and exploiting the photopolymer self-writing effect, the fabricated waveguides exhibit remarkable long-distance light transmission capabilities. The waveguides exceed 1.6 times the focal length of the microlens, along with excellent stray-light suppression. The reduction of 63.2 % in stray-light content and reduction of 81.98 % in point-source transmittance (PST) values were achieved. Optical performance tests confirm that the system is characterized by excellent focusing capabilities, a large field of view, and high sensitivity. This integrated architecture provides a crosstalk-minimized solution for micro-optical systems while advancing high-density optical MEMS and bioinspired vision technologies.
Electric field poling of electro-optic polymer (EOP) in hybrid waveguides is highly challenging due to the discontinuity in electric field distribution, which leads to a low Pockels electro-optic (EO) coefficient or d...
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Electric field poling of electro-optic polymer (EOP) in hybrid waveguides is highly challenging due to the discontinuity in electric field distribution, which leads to a low Pockels electro-optic (EO) coefficient or dielectric breakdown. We propose the segmented poling technique in Si 3 N 4 /EOP hybrid waveguides to address this challenge. Dipolar chromophores near an electrode interface first align with a weak poling electric field, and then a strong field is applied for the chromophore alignment near the waveguide interface. This technique effectively avoids dielectric breakdown, and the tuning efficiency of the EO Mach–Zender interferometer (MZI) filters is improved from 31.7 pm/V to higher than 50 pm/V, with a highest Pockels coefficient of 114 pm/V.
A modification of the saddle point method is proposed for computation of non-stationary wave processes (pulses) in waveguides. The dispersion diagram of the waveguide is continued analytically. A set of possible saddl...
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Topological band theory strongly relies on prototypical lattice models with particular symmetries. We report here on a theoretical and experimental work on acoustic waveguides that are directly mapped to the one-dimen...
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Multi-photon lithography1-3 has emerged as a powerful tool for photonic integration, allowing to complement planar photonic circuits by 3D-printed freeform structures such as waveguides4,5 or micro-optical elements6,7...
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Nonlinear optical processes in waveguides play important roles in compact integrated photonics,while efficient coupling and manipulations inside the waveguides still remain *** this work,we propose a new scheme for se...
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Nonlinear optical processes in waveguides play important roles in compact integrated photonics,while efficient coupling and manipulations inside the waveguides still remain *** this work,we propose a new scheme for second-harmonic generation as well as beam shaping in lithium niobate slab waveguides with the assistance of well-designed grating metasurfaces atλ=1064 *** encoding the amplitude and phase into the holographic gratings,we further demonstrate strong functionalities of nonlinear beam shaping by the metasurface design,including dual focusing and Airy beam *** approach would inspire new designs in the miniaturization and integration of compact multifunctional nonlinear light sources on chip.
In this work we review in part of the whispering-gallery-mode (WGM) lasers in Er-3 +/--doped silica glass microspheres (mu S) towards integration in silicon-on-insulator (S01) slotted photonic crystal waveguides. The ...
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ISBN:
(数字)9781728154459
ISBN:
(纸本)9781728154459
In this work we review in part of the whispering-gallery-mode (WGM) lasers in Er-3 +/--doped silica glass microspheres (mu S) towards integration in silicon-on-insulator (S01) slotted photonic crystal waveguides. The Er-3 +/--doped silica glass mu S with suitable diameters fabricated by using an electrical discharge method The single-mode optical tapered fibers were used to guide the pumped laser into the mu S surface and collect the resulting lasing emission. The observation of WGM at telecom regime is quantified With the presented scheme, the selective single- or multi-emitted modes of the mu S laser can be obtained by adjusting the coupling gap between the collection tapered fiber and the mu S surface To overcome the collection tapered fiber's vibration at close range of the coupling gap, the guiding and coupling losses, while being compact enough to fit with complementary metal oxide semiconductor (CMOS) device, the integration of mu S with SOI slotted photonic crystal waveguides is proposed and modeled with the help of finite-difference time-domain (FDTD) simulations. The designed structures may find application for the promising photonic devices such as the ultrahigh sensitivity sensors, the lasing sources, and towards advanced quantum communications.
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