Nonlinear Optics and Spectroscopy

Bloembergen, N.

doi:10.1142/9789814540223_0042

Cited by 7 publications

(7 citation statements)

References 1 publication

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“…Nonlinear optical (NLO) properties play an increasingly significant role in the development of laser technology, optical spectroscopy, and material structure analysis methodologies 1 – 4 . Recently, the study of NLO activity in two-dimensional (2D) layered materials (such as graphene, transition metal chalcogenides (TMDCs), and black phosphorus (BP)) has made significant progress 5 – 12 .…”

Section: Introductionmentioning

confidence: 99%

Giant nonlinear optical activity in two-dimensional palladium diselenide

Kuang

et al. 2021

Nat Commun

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Nonlinear optical effects in layered two-dimensional transition metal chalcogenides have been extensively explored recently because of the promising prospect of the nonlinear optical effects for various optoelectronic applications. However, these materials possess sizable bandgaps ranging from visible to ultraviolet region, so the investigation of narrow-bandgap materials remains deficient. Here, we report our comprehensive study on the nonlinear optical processes in palladium diselenide (PdSe2) that has a near-infrared bandgap. Interestingly, this material exhibits a unique thickness-dependent second harmonic generation feature, which is in contrast to other transition metal chalcogenides. Furthermore, the two-photon absorption coefficients of 1–3 layer PdSe2 (β ~ 4.16 × 105, 2.58 × 105, and 1.51 × 105 cm GW−1) are larger by two and three orders of magnitude than that of the conventional two-dimensional materials, and giant modulation depths (αs ~ 32%, 27%, and 24%) were obtained in 1–3 layer PdSe2. Such unique nonlinear optical characteristics make PdSe2 a potential candidate for technological innovations in nonlinear optoelectronic devices.

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Section: Introductionmentioning

confidence: 99%

Giant nonlinear optical activity in two-dimensional palladium diselenide

Kuang

et al. 2021

Nat Commun

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“…This is a physically appealing picture, but presents some serious drawbacks: first, it does not provide a general prescription for finding effective Hamiltonians since the particular details strongly depend on the model considered. Second, it could become very cumbersome, and explicit but enormously complicated expressions for the different orders of approximation can be found in many original publications [11,12]. Third, the procedure is not uniquely defined: depending on the term eliminated, the outcome of the final Hamiltonian could be different [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Master equations for effective Hamiltonians

Klimov

Romero

Delgado

et al. 2002

J. Opt. B: Quantum Semiclass. Opt.

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Abstract. We reelaborate on a general method for obtaining effective Hamiltonians that describe different nonlinear optical processes. The method exploits the existence of a nonlinear deformation of the su(2) algebra that arises as the dynamical symmetry of the original model. When some physical parameter (usually related to the dispersive limit) becomes small, we immediately get a diagonal effective Hamiltonian that represents correctly the dynamics for arbitrary states and long times. We apply the same technique to obtain how the noise terms in the original model transform under this scheme, providing a systematic way of including damping effects in processes described in terms of effective Hamiltonians.

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“…Since the generated harmonics show very sharp resonances, they can be used as a frequency standard in the optical region. The realization of the optical frequency comb has paved the way to important applications in optical metrology 3 , high precision spectroscopy 4,5 and telecommunication technologies 1,6 .…”

Section: Introductionmentioning

confidence: 99%

Radiation comb generation with extended Josephson junctions

Solinas

Bosisio

Giazotto³

2015

Journal of Applied Physics

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We propose the implementation of a Josephson radiation comb generator (JRCG) based on an extended Josephson junction subject to a time dependent magnetic field. The junction critical current shows known diffraction patterns and determines the position of the critical nodes when it vanishes. When the magnetic flux passes through one of such critical nodes, the superconducting phase must undergo a π-jump to minimize the Josephson energy. Correspondingly a voltage pulse is generated at the extremes of the junction. Under periodic driving this allows us to produce a comb-like voltage pulses sequence. In the frequency domain it is possible to generate up to hundreds of harmonics of the fundamental driving frequency, thus mimicking the frequency comb used in optics and metrology. We discuss several implementations through a rectangular, cylindrical and annular junction geometries, allowing us to generate different radiation spectra and to produce an output power up to 10 pW at 50 GHz for a driving frequency of 100 MHz.

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Nonlinear Optics and Spectroscopy

Cited by 7 publications

References 1 publication

Giant nonlinear optical activity in two-dimensional palladium diselenide

Giant nonlinear optical activity in two-dimensional palladium diselenide

Master equations for effective Hamiltonians

Radiation comb generation with extended Josephson junctions

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