Segmented cylindrical vector beams for massively-encoded optical data storage

Xian, Mingcong; Xu, Yi; Ouyang, Xu; Cao, Yaoyu; Lan, Sheng; Li, Xiangping

doi:10.1016/j.scib.2020.07.016

Cited by 47 publications

(24 citation statements)

References 58 publications

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“…The existence of randomly distributed hotspots induced by the plasmonic coupling between Ga nanoislands can be exploited to realize optical memory with ultralow energy and ultrahigh density. [41,42] As a proof-of-principle demonstration, we employed closely-packed Ga nanoislands to implement optical data storage. First, we demonstrated data recording and readout by using a laser scanning confocal microscope with a small irradiance (below the burst threshold), as shown in Figure 5a-d.…”

Section: Wwwadvopticalmatdementioning

confidence: 99%

“…It implies that the PL intensity of the Ga nanoislands was reduced by laser irradiation when the excitation irradiance is below the burst threshold, similar to phenomenon observed previously. [41][42][43] From the extracted pattern shown in Figure 5a, we obtained the distribution of the PL intensities of all the pixels, as shown in Figure 5d. The dependence of C p on I c is also presented.…”

Section: Wwwadvopticalmatdementioning

confidence: 99%

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Efficient White Light Emission from Ga/Ga₂O₃ Hybrid Nanoparticles

Xiang

Sun

et al. 2021

Advanced Optical Materials

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Noble metals such as gold (Au) and silver (Ag) have been widely used as plasmon materials due to their excellent optical and thermal properties. Although Ag possesses excellent optical properties, it suffers serious oxidation when exposing to air. Au has outstanding chemical stability, however, the large d-s band absorption at high frequencies limits its plasmonic performance in the ultraviolet spectral region. [4] Apart from Ag and Au, gallium (Ga) is now showing great promise because of its unique chemical and physical properties. It has a very low melting point of just 303 K (29 °C) and possesses surface plasmon resonances spanning the ultraviolet to visible spectral region. [5][6][7][8] Additionally, Ga is chemically stable because of the existence of a thin gallium oxide (Ga 2 O 3 ) layer on the surface. Ga nanoparticles (NPs) appear highly promising for surface-enhanced Raman scattering/fluorescence because of their remarkable SPRs. [9][10][11][12] The low melting point of Ga renders it an advantage for making all-optical phase-change memory and logic devices, [13] phase transition nonlinear substrates, [14] and high-capacity self-healing anodes in lithium-ion batteries. [15] Recently, it has been experimentally confirmed through real-time ellipsometry the stable coexistence between solid core and liquid shell in substrate-supported Ga NPs. [16] In addition, Ga has excellent flexibility, stretchability, and low toxicity, which makes it an attractive candidate for flexible electronics and wearable sensing devices. [17] Broadband nanoscale emitters at optical frequencies are now attracting tremendous interest because they are urgently needed for various practical applications, such as ultra-compact optical chips, nanospectroscopy, and active photonic devices. [18,19] Nanoscale white light emitters can be used to probe the near field and to map the local density of states of a nanostructure. However, the achievement of efficient nanoscale white light sources still remains a big challenge. According to Fermi's golden rule, [20,21] the emission intensity of a nanostructure is proportional to the local electric field at the emission wavelength E em (r, λ em ), which is known as the Purcell effect. In addition, it is also closely related to the electric Gallium (Ga) emerges as a promising material in plasmonics mainly due to its extraordinary properties, such as changeable material phase, tunable plasmon resonances across the ultraviolet to near-infrared spectral range, and remarkable chemical stability. Here, the efficient white light emission from gallium oxide (Ga 2 O 3 ) nanoparticles doped with liquid Ga nanodots, which are fabricated by using a laser-induced oxidation method is reported. The quantum efficiency of Ga/Ga 2 O 3 hybrid nanoparticles is found to be ≈1.3%, which is nearly two orders of magnitude larger than that of liquid Ga nanoparticles. It is revealed that the existence of Schottky barrier and hotspots in Ga/Ga 2 O 3 nanoparticles plays a crucial role in enhancing the quantum efficiency. As an ...

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Section: Wwwadvopticalmatdementioning

confidence: 99%

Section: Wwwadvopticalmatdementioning

confidence: 99%

Efficient White Light Emission from Ga/Ga₂O₃ Hybrid Nanoparticles

Xiang

Sun

et al. 2021

Advanced Optical Materials

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“…Recent progress in the light field structure engineering [50][51][52], has highlighted the degrees of freedom of a structured light field as powerful tools for information encoding. For example, the optical encryption protocols based on the phase structure modulation [53] and orbital angular momentum and polarization state mode division multiplexing [54][55][56][57][58][59][60] have been developed lately.…”

Section: Intorductionmentioning

confidence: 99%

Optical Coherence Encryption with Structured Random Light

Peng¹,

Huang²,

Liu

et al. 2021

Preprint

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Information encryption with optical technologies has become increasingly important due to remarkable multidimensional capabilities of light fields. However, the optical encryption protocols proposed to date have been primarily based on the first-order field characteristics, such as the optical field amplitude and phase as well as its polarization. As the said first-order characteristics of light fields are strongly affected by interference effects, the conventional encoding protocols become quite unstable during light propagation and interaction with the matter. Here, we introduce an alternative optical encryption protocol whereby the information is encoded into the spatial coherence distribution of a structured random light beam via a generalized van Cittert--Zernike theorem. We show that the proposed approach has two key advantages over its conventional counterparts. First, the complexity of measuring the spatial coherence distribution of light enhances the encryption protocol security. Second, the relative insensitivity of the second-order statistical characteristics of light to environmental noise makes the protocol robust against the environmental fluctuations, e.g, the atmospheric turbulence. We carry out experiments to demonstrate the feasibility of the coherence-based encryption method with the aid of a fractional Fourier transform. Our results open up a promising avenue for further research into optical encryption in complex environments.

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“…Compared with scalar beams, vector beams (VBs) with spatially inhomogeneous polarization states distribution have many novel properties [1,2]. This makes VBs were researched and applied in many fields, such as super-resolution imaging [3,4], focus engineering [5,6], particle trapping and manipulations [7,8], laser materials processing [9], data storage [10], optical communication [11]. Driven by the application prospects in these fields, many methods have been proposed to generate VBs, especially higher-order Poincaré (HOP) beams.…”

Section: Introductionmentioning

confidence: 99%

Electro-Optic Modulation of Higher-Order Poincaré Beam Based on Nonlinear Optical Crystal

et al. 2022

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Vector beams (VBs) have spatially inhomogeneous polarization states distribution and have been widely used in many fields. In this paper, we proposed a method to modulate polarization states of higher-order Poincaré (HOP) beams and designed a system based on Mach-Zehnder interferometers, in which polarization state (include azimuth and ellipticity) of generated HOP beams were modulated by linear electro-optic (EO) effect of nonlinear optical crystals. Using this method, the polarization state of generated HOP beams could be controlled by voltage signal applied on EO crystals, which makes the process of the polarization state change with no optical element moving and mechanical vibrations. Besides, due to the flexibility of the voltage signal, the polarization state could be switched directly and immediately.

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Segmented cylindrical vector beams for massively-encoded optical data storage

Cited by 47 publications

References 58 publications

Efficient White Light Emission from Ga/Ga₂O₃ Hybrid Nanoparticles

Efficient White Light Emission from Ga/Ga₂O₃ Hybrid Nanoparticles

Optical Coherence Encryption with Structured Random Light

Electro-Optic Modulation of Higher-Order Poincaré Beam Based on Nonlinear Optical Crystal

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Segmented cylindrical vector beams for massively-encoded optical data storage

Cited by 47 publications

References 58 publications

Efficient White Light Emission from Ga/Ga2O3 Hybrid Nanoparticles

Efficient White Light Emission from Ga/Ga2O3 Hybrid Nanoparticles

Optical Coherence Encryption with Structured Random Light

Electro-Optic Modulation of Higher-Order Poincaré Beam Based on Nonlinear Optical Crystal

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Product

Resources

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Efficient White Light Emission from Ga/Ga₂O₃ Hybrid Nanoparticles

Efficient White Light Emission from Ga/Ga₂O₃ Hybrid Nanoparticles