Terahertz-wave generation in quasi-phase-matched GaAs

Vodopyanov, Konstantin L.; Fejer, M. M.; Yu, Xiaojun; Harris, J. S.; Lee, Yun-Shik; Hurlbut, Walter C.; Kozlov, V. G.; Bliss, D.; Lynch, C.

doi:10.1063/1.2357551

Cited by 133 publications

(75 citation statements)

References 14 publications

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“…On the other hand, at 8 THz, DAST also has stronger THz absorption than at 6 THz [21]. It should be mentioned that the phasematching technique discussed here substantially differs from the quasi-phase-matching technique based on using periodically poled materials [23,24], which was proposed in one of the pioneering publications of nonlinear optics [25]. In particular, the DAST∕ SiO 2 structure is aimed at generation of near-single-cycle THz pulses, whereas periodically poled materials provide an opportunity to obtain multicycle THz pulses.…”

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confidence: 87%

DAST/SiO_2 multilayer structure for efficient generation of 6 THz quasi-single-cycle electromagnetic pulses

2012

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We propose a DAST∕ SiO 2 multilayer structure for efficient generation of near-single-cycle THz transients with average frequency around 6 THz via collinear optical rectification of 800 nm femtosecond laser pulses. The use of such a composite material allows compensation for the phase mismatch that accompanies THz generation in bulk DAST crystals. The presented calculations indicate a strong increase in the THz generation efficiency in the DAST∕ SiO 2 structure in comparison to the case of bulk DAST crystal.

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confidence: 87%

DAST/SiO_2 multilayer structure for efficient generation of 6 THz quasi-single-cycle electromagnetic pulses

2012

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“…190 [4][5][6], and quantum information processing [7][8][9]. A well-known approach for lowering the power requirements of such nonlinear devices is that of employing optical resonators which confine light for long times (dimensionless lifetimes Q) in small volumes V [10-21].…”

Section: Ocis Codesmentioning

confidence: 99%

“…

OCIS codes:190 [4][5][6], and quantum information processing [7][8][9]. A well-known approach for lowering the power requirements of such nonlinear devices is that of employing optical resonators which confine light for long times (dimensionless lifetimes Q) in small volumes V [10-21].

…”

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confidence: 99%

“…Nonlinear frequency conversion (NFC) plays a crucial role in many photonic applications, including ultrashort pulse shaping [1,2], spectroscopy [3], generating novel states of light [4][5][6], and quantum information processing [7][8][9]. A well-known approach for lowering the power requirements of such nonlinear devices is that of employing optical resonators which confine light for long times (dimensionless lifetimes Q) in small volumes V [10][11][12][13][14][15][16][17][18][19][20][21].…”

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confidence: 99%

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Topology optimization of multi-track ring resonators and 2D microcavities for nonlinear frequency conversion

2017

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We exploit recently developed topology-optimization techniques to design complex, wavelength-scale resonators for enhancing various nonlinear χ (2) and χ (3) frequency conversion processes.In particular, we demonstrate aperiodic, multi-track ring resonators and 2D slab microcavities exhibiting long lifetimes Q 10 4 , small modal volumes V (λ/2n) 3 , and among the largest nonlinear overlaps (a generalization of phase matching in largeetalon waveguides) possible, paving the way for efficient, compact, and wide-bandwdith integrated nonlinear devices. OCIS codes:190 [4][5][6], and quantum information processing [7][8][9]. A well-known approach for lowering the power requirements of such nonlinear devices is that of employing optical resonators which confine light for long times (dimensionless lifetimes Q) in small volumes V [10-21]. Although microcavity resonators designed for on-chip, infrared applications promise some of the smallest confinement factors available, their implementation is highly limited by the difficult task of identifying wavelength-scale (V ∼ λ 3 ) structures supporting long-lived, resonant modes at widely separated wavelengths and satisfying rigid frequency-matching and mode-overlap constraints [15,22]. Recently, we proposed a computational framework based on largescale topology-optimization (TO) techniques that enables automatic discovery of multilayer and grating structures exhibiting some of the largest SHG figures of merit ever predicted [23].In this letter, we extend our TO formulation to allow the possibility of more sophisticated nonlinear processes and apply it to the problem of designing rotationally symmetric and slab microresonators that exhibit high-efficiency second harmonic generation (SHG) and * Corresponding author: zinlin@g.harvard.edu sum/difference frequency generation (SFG/DFG). In particular, we demonstrate multi-track ring resonators and proof-of-principle two-dimensional slab cavities supporting multiple, resonant modes (even several octaves apart) that would be impossible to design "by hand". Our designs ensure frequency matching, long radiative lifetimes, and small (wavelength-scale) modal confinement while also simultaneously maximizing the nonlinear modal overlap (or "phase matching") necessary for efficient NFC. For instance, we discover topology-optimized concentric ring cavities exhibiting SHG efficiencies as high as P 2 /P 2 1 = 1.3 × 10 25 χ (2) 2 [W −1 ] even with low operational Q ∼ 10 4 , a performance that is on a par with recently fabricated 60µm-diameter, ultrahigh Q ∼ 10 6 AlN microring resonators [21] (P 2 /P 2 1 ∼ 1.13 × 10 24 χ (2) 2 [W −1 ]); essentially, our topology-optimized cavities not only possess the smallest possible modal volumes ∼ (λ/n) 3 , but can also operate over wider bandwidths by virtue of their increased nonlinear modal overlap.As reviewed in Refs. 23-25, a typical topology optimization problem seeks to maximize or minimize an objective function f , subject to certain constraints g, over a set of free variables or degrees of freedom (D...

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“…rectifications procedures [73] can be applied to extract the useful THz oscillations [4,5,[74][75][76][77].…”

Section: -4mentioning

confidence: 99%

High-efficiency degenerate four-wave mixing in triply resonant nanobeam cavities

et al. 2014

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Using a combination of temporal coupled-mode theory and nonlinear finite-difference time-domain (FDTD) simulations, we study the nonlinear dynamics of all-resonant four-wave mixing processes and demonstrate the possibility of achieving high-efficiency limit cycles and steady states that lead to ≈100% depletion of the incident light at low input (critical) powers. Our analysis extends previous predictions to capture important effects associated with losses, self-and cross-phase modulation, and imperfect frequency matching (detuning) of the cavity frequencies. We find that maximum steady-state conversion is hypersensitive to frequency mismatch, resulting in high-efficiency limit cycles that arise from the presence of a homoclinic bifurcation in the solution phase space, but that a judicious choice of incident frequencies and input powers, in conjuction with self-phase and cross-phase modulation, can restore high-efficiency steady-state conversion even for large frequency mismatch. Assuming operation in the telecom range, we predict close to perfect quantum efficiencies at reasonably low ∼50 mW input powers in silicon micrometer-scale PhC nanobeam cavities.

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Terahertz-wave generation in quasi-phase-matched GaAs

Cited by 133 publications

References 14 publications

DAST/SiO_2 multilayer structure for efficient generation of 6 THz quasi-single-cycle electromagnetic pulses

DAST/SiO_2 multilayer structure for efficient generation of 6 THz quasi-single-cycle electromagnetic pulses

Topology optimization of multi-track ring resonators and 2D microcavities for nonlinear frequency conversion

High-efficiency degenerate four-wave mixing in triply resonant nanobeam cavities

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