Temperature dependence of LiNbO3 dislocation density in the near-surface layer

Semenova, O. R.; Sosunov, A. V.; Prokhorov, Nikolai S.; Ponomarev, Roman

doi:10.3788/col202220.061601

Cited by 3 publications

(3 citation statements)

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“…The working principle of the MMI is based on the self-image effect of multimode interference, that is, the input light field will excite a series of higher-order with different propagation constants modes in the multi-mode region, these higher-order modes will periodically interfere and be imaged at a specific position in the propagation direction [20]. The light field at the distance L point in the propagation direction can be described by equation (1),…”

Section: Device Structure and Principlementioning

confidence: 99%

“…Lithium niobate (LN) is the key material for photonic integrated circuits (PICs) [1], quantum photonic integrated circuits [2] and programmable quantum processors [3], due to its large electro-optic coefficient γ33 = 32 pm V −1 [1], high nonlinear coefficient, a wideband optical transparency window of 0.35 ∼ 5.5 μm, and high Curie temperature ∼ 1145 °C. Recently, thin film lithium niobite (TFLN) on insulator substrates has become commercially available, which had been utilized with nanofabrication technology for the realization of electro-optical modulators [4], ultralow low loss beam splitters and waveguides [5], and entangled photon sources [6], phase shifters and so on.…”

Section: Introductionmentioning

confidence: 99%

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Low-loss, broadband MMI coupler based on thin film lithium niobate platform

Li¹,

Rao²,

He³

et al. 2023

Phys. Scr.

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A low-loss broadband power splitter based on X-cut lithium niobate is proposed by utilizing the multimode interference coupler with a shallow-etched slot, wedge-shaped structure and SiO2 cladding. The multimode waveguide with a shallow-etch slot could reduce the sensitivity of multi-mode region on the wavelength and reach to high-quality imaging requirements. Results show that there is an excess loss around 0.01 dB at the operation wavelength of 1550 nm, a broad operation bandwidth of ~ 1314 nm and large tolerance in the shallow-etching. Additionally, our proposed device has been compared with the published and conventional multimode interference coupler for presenting good low-loss and broad bandwidth.

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Section: Device Structure and Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-loss, broadband MMI coupler based on thin film lithium niobate platform

Li¹,

Rao²,

He³

et al. 2023

Phys. Scr.

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“…It is interesting to compare the dynamic change in the amplitude values of forced oscillations (see Figure 8b, red curve) with the change in resistance to the SB deformation (strength) caused by Bochvar-Oding dislocations: the maximum SB strength will decrease with the increase in dislocation density until it reaches a critical value, at which, dislocations will start to hinder and inhibit their own movement in the defective SB structure [28,29].…”

Section: Stress-strain Relationshipsmentioning

confidence: 99%

Exploring the Effects of Cramped-Impact-Type Mechanical Action on Active Pharmaceutical Ingredient (Levofloxacin)—Prospects for Pharmaceutical Applications

Uspenskaya,

Simutina,

Kuzmina

et al. 2023

Powders

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Mechanochemistry is one of the ten great discoveries of green chemistry methods for synthesizing new substances. A drug substance from the fluoroquinolone group was exposed to high-intensity mechanical impacts using a laboratory knife mill for 21 min and constantly monitored by analyzing samples extracted every 3 min with DLS, SLS, LALLS, 2D-LS, optical and digital microscopy, FTIR, and Spirotox methods. A dispersity phenomenon was detected in an area where catastrophic dislocations formed and multiplied via laser methods. The positive correlation between the temperature of deformation and stress was demonstrated, similar to a typical stress–strain curve of a Bochvar–Oding curve and Young’s modulus: the angular coefficient of the straight section to OX was tgα = 10 min−1. Z-Average, ζ-potential, and polydispersity index dependences were represented as discontinuous periodic oscillations analogous to the defect and impurity transitions near the dislocation core. Deformation r from the high-intensity mechanical impact resulted in covalent bonds showing hyper- and hypochromic effects under FTIR spectra, a bathochromic shift of the maximum, and an oscillation emission at 3240 cm−1. A 2D-LS fingerprint diagram obtained via the topological convolution of the light scattering matrix made it possible to distinguish the off-loading samples from the native substance. The investigation of the dissolution kinetics in water via laser diffraction led to conclusions about the limiting diffusion stage and the acceleration of the mechanoactivation of the solid body’s dissolution under both linear and plastic deformation. The acceleration of obsEa of the cell death process in the temperature range from 296 to 302 K indicated a significant (2.5-fold) decrease in the toxicity of the aqueous 9 mM (1:3) sample solution at 21 min compared to that of the native levofloxacin. Adherence to the mechanochemistry laws provides an opportunity for drug repositioning to change their brand status by identifying new physicochemical and biological properties.

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