Enhanced generation of nondegenerate photon pairs in nonlinear metasurfaces

Parry, Matthew; Mazzanti, Andrea; Poddubny, Alexander N.; Valle, Giuseppe Della; Neshev, Dragomir N.; Sukhorukov, Andrey A.

doi:10.1117/1.ap.3.5.055001

Cited by 78 publications

(55 citation statements)

References 38 publications

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“…Finally, and most interestingly, when substituting η SPDC in equation ( 3), we estimate a photon pair generation rate, normalized to the pump power, of 1.75 kHz mW −1 . This magnitude is similar to the prediction for BIC-enhanced in a 2D metasurface that emits in the normal direction [23], whereas the 1D metasurface considered in this work allows for a broad off-normal angular emission that may be desirable for different types of applications. We note that the aperture angle of signal or idler photon emission is relatively narrow, being about 8 • , centred at 23 • emission angle (i.e.…”

Section: Enhanced Photon-pair Generationsupporting

confidence: 82%

“…Notably, the strongest enhancement of nonlinear interactions in metasurfaces can be achieved through resonances based on bound states in the continuum (BICs) [20][21][22]. It was recently suggested theoretically that BICs in metasurfaces composed of reduced-symmetry nanoresonators can be used to enhance the photon-pair generation rate and spectral brightness [23]. However, the photon emission was predicted to occur primarily in the close to normal direction.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced generation of angle correlated photon-pairs in nonlinear metasurfaces

et al. 2022

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We reveal that strongly enhanced generation of photon pairs with narrow frequency spectra and sharp angular correlations can be realised through spontaneous parametric down-conversion in metasurfaces. This is facilitated by creating meta-gratings through nano-structuring of nonlinear films of sub-wavelength thickness to support the extended bound state in the continuum resonances, associated with ultra-high Q-factors, at the biphoton wavelengths across a wide range of emission angles. Such spectral features of photons can be beneficial for various applications, including quantum imaging. Our modelling demonstrates a pronounced enhancement, compared to unpatterned films, of the total photon-pair generation rate normalized to the pump power reaching 1.75 KHz/mW, which is robust with respect to the angular bandwidth of the pump, supporting the feasibility of future experimental realisations.

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Section: Enhanced Photon-pair Generationsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Enhanced generation of angle correlated photon-pairs in nonlinear metasurfaces

et al. 2022

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“…The wavelength-dependent complex refractive index of Si is extracted from experimental data 49 , and the constant refractive index of 1.45 is assigned to SiO 2 . Note that we choose the dimer design as it belongs to a symmetric geometry of C 2v group and possesses more structural parameters to be tuned than C 4v configurations [50][51][52][53][54][55][56][57][58][59] . Benefiting from the additional degree of freedom, it is possible to manipulate the excitation of dual BIC resonances by adjusting the structural geometry and rotating the fundamental pump polarization.…”

Section: Polarization-controlled Dual Bound States In the Continuummentioning

confidence: 99%

Polarization-controlled dynamically switchable high-harmonic generation from all-dielectric metasurfaces governed by dual bound states in the continuum

Xiao,

Qin,

Duan

et al. 2022

Preprint

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Tailoring optical nonlinear effects (e.g. harmonic generation, sum-frequency mixing, etc.) in the recently emerging all-dielectric platform is important for both the fundamental science and industrial development of high-efficiency, ultrafast, and miniaturized photonic devices. In this work, we propose a novel paradigm for dynamically switchable high-harmonic generation in Silicon nanodimer metasurfaces by exploiting polarization-controlled dual bound states in the continuum (BIC). Owing to the high-quality factor of BIC resonances, efficient harmonic signals including the third-harmonic generation and fifth-harmonic generation from a direct process as well as a cascaded process by degenerate four-wave mixing are obtained. Moreover, the BICs and their resonantly enhanced harmonics can be switched on or off with high selectivity respect to the fundamental pump polarization. Compared with previous reports, our work provide a simple but effective tuning strategy by fully exploring the structural symmetry and polarization degree of freedom rather than resorting to additional external stimuli, which would have great advantages in smart designing tunable and switchable nonlinear light source for chip-scale applications.

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“…S1). We then use the CMT to efficiently simulate the sum frequency generation (SFG) process and calculate the SPDC emission via quantum-classical correspondence [17,19]. Figure 1d shows the predicted photon-pair rate integrated over their frequency spectra vs. the transverse momenta in the metasurface plane, for a normally incident plane-wave pump with the frequency ω p = 2×191.19 THz.…”

Section: Concept and Modellingmentioning

confidence: 99%

“…An enhancement of SPDC through localized Mie-type optical resonances [16] in nanoantennas [17] and metasurfaces [18] was experimentally demonstrated. Recent theoretical studies [19][20][21] suggested that using metasurfaces with nonlocal lattice resonances can further boost the SPDC efficiency, yet the realization of this concept remained outstanding.…”

Section: Introductionmentioning

confidence: 99%

Spatially entangled photon-pairs from lithium niobate nonlocal metasurfaces

Zhang,

Ma,

Parry

et al. 2022

Preprint

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Metasurfaces consisting of nano-scale structures are underpinning new physical principles for the creation and shaping of quantum states of light.Multi-photon states that are entangled in spatial or angular domains are an essential resource for quantum imaging and sensing applications, however their production traditionally relies on bulky nonlinear crystals. We predict and demonstrate experimentally the generation of spatially entangled photon pairs through spontaneous parametric down-conversion from a metasurface incorporating a nonlinear thin film of lithium niobate. This is achieved through nonlocal resonances with tailored angular dispersion mediated by an integrated silica meta-grating, enabling control of the emission pattern and associated quantum states of photon pairs by designing the grating profile and tuning the pump frequency. We measure the correlations of photon positions and identify their spatial anti-bunching through violation of the classical Cauchy-Schwartz inequality, witnessing the presence of multi-mode entanglement. Simultaneously, the photon-pair rate is strongly enhanced by 450 times as compared to unpatterned films due to high-quality-factor metasurface resonances, and the coincidence to accidental ratio reaches 5000. These results pave the way to miniaturization of various quantum devices by incorporating ultra-thin metasurfaces functioning as room-temperature sources of quantum-entangled photons.

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Enhanced generation of nondegenerate photon pairs in nonlinear metasurfaces

Cited by 78 publications

References 38 publications

Enhanced generation of angle correlated photon-pairs in nonlinear metasurfaces

Enhanced generation of angle correlated photon-pairs in nonlinear metasurfaces

Polarization-controlled dynamically switchable high-harmonic generation from all-dielectric metasurfaces governed by dual bound states in the continuum

Spatially entangled photon-pairs from lithium niobate nonlocal metasurfaces

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