Synthetic helical dichroism for six-dimensional optical orbital angular momentum multiplexing

Ouyang, Xu; Xu, Yi; Xian, Mincong; Feng, Ziwei; Zhu, Linwei; Cao, Yaoyu; Lan, Sheng; Guan, Bai‐Ou; Qiu, Cheng‐Wei; Gu, Miṅ; Li, Xiangping

doi:10.1038/s41566-021-00880-1

Cited by 144 publications

(84 citation statements)

References 36 publications

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“…Generally, the quality of a recorded pattern character-ized by the correlation coefficient can be improved by increasing the recording energy. However, the crosstalk between different recording channels will become larger as the recording energy increase, which results in the reduction of storage capacity and possibly the damage of storage media 40 . Therefore, how to optimize recording energy becomes an issue in the multiplexed optical storage.…”

Section: Resultsmentioning

confidence: 99%

Near-perfect fidelity polarization-encoded multilayer optical data storage based on aligned gold nanorods

Zhu¹,

Chen²,

Ouyang³

et al. 2021

OEA

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Encoding information in light polarization is of great importance in facilitating optical data storage (ODS) for information security and data storage capacity escalation. However, despite recent advances in nanophotonic techniques vastly enhancing the feasibility of applying polarization channels, the data fidelity in reconstructed bits has been constrained by severe crosstalks occurring between varied polarization angles during data recording and reading process, which gravely hindered the utilization of this technique in practice. In this paper, we demonstrate an ultra-low crosstalk polarization-encoding multilayer ODS technique for high-fidelity data recording and retrieving by utilizing a nanofibre-based nanocomposite film involving highly aligned gold nanorods (GNRs). With parallelizing the gold nanorods in the recording medium, the information carrier configuration minimizes miswriting and misreading possibilities for information input and output, respectively, compared with its randomly self-assembled counterparts. The enhanced data accuracy has significantly improved the bit recall fidelity that is quantified by a correlation coefficient higher than 0.99. It is anticipated that the demonstrated technique can facilitate the development of multiplexing ODS for a greener future.

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Section: Resultsmentioning

confidence: 99%

Near-perfect fidelity polarization-encoded multilayer optical data storage based on aligned gold nanorods

Zhu¹,

Chen²,

Ouyang³

et al. 2021

OEA

Self Cite

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“…Given that the scheme of using integrated optics 39,40 to generate ST vortices is still limited by the processing accuracy, material intrinsic absorption, etc., our method may be the first choice for studying transverse OAM at present. At this stage, the SLM in the experiment can be replaced by the flexible metasurfaces [41][42][43] or the LC geometric phase devices 44,45 with additional polarization response, which would allow the multidimensional multiplexing of STB vortices via photonic spin-orbit interactions. Although our results show that dispersion engineering works well in suppressing the time diffraction, the required negative dispersion is quite large.…”

Section: Discussionmentioning

confidence: 99%

Time diffraction-free transverse orbital angular momentum beams

et al. 2022

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The discovery of optical transverse orbital angular momentum (OAM) has broadened our understanding of light and is expected to promote optics and other physics. However, some fundamental questions concerning the nature of such OAM remain, particularly whether they can survive from observed mode degradation and hold OAM values higher than 1. Here, we show that the strong degradation actually origins from inappropriate time-delayed kx–ω modulation, instead, for transverse OAM having inherent space-time coupling, immediate modulation is necessary. Thus, using immediate x–ω modulation, we demonstrate theoretically and experimentally degradation-free spatiotemporal Bessel (STB) vortices with transverse OAM even beyond 102. Remarkably, we observe a time-symmetrical evolution, verifying pure time diffraction on transverse OAM beams. More importantly, we quantify such nontrivial evolution as an intrinsic dispersion factor, opening the door towards time diffraction-free STB vortices via dispersion engineering. Our results may find analogues in other physical systems, such as surface plasmon-polaritons, superfluids, and Bose-Einstein condensates.

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“…Moreover, the demonstration was realised in a very compact volume with ultra-dense information density with an equivalent capacity of 1.6 TB in a single disc by exploiting the properties of longitudinal surface plasmon resonance of gold nanorods. This multiplexing data storage scheme was extended to 6D now, by exploiting OAM as an additional dimension 74 (Fig. 3b ).…”

Section: Higher-dimensional and Multiple Dof Classically Structured L...mentioning

confidence: 99%

“…The correction of aberrations is crucial for both light illumination and signal detection, as the induced phase and polarisation errors can cause detrimental degeneration of information such as image contrast, OAM phase distribution (purity) and correctness of vectorial information. They are vital for light multiplexing, such as direct OAM and/or polarisation multiplexing 74 , 168 . The novel adaptive optics (AO) technique for both phase and polarisation errors correction (Fig.…”

Section: Higher-dimensional and Multiple Dof Classically Structured L...mentioning

confidence: 99%

Towards higher-dimensional structured light

2022

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Structured light refers to the arbitrarily tailoring of optical fields in all their degrees of freedom (DoFs), from spatial to temporal. Although orbital angular momentum (OAM) is perhaps the most topical example, and celebrating 30 years since its connection to the spatial structure of light, control over other DoFs is slowly gaining traction, promising access to higher-dimensional forms of structured light. Nevertheless, harnessing these new DoFs in quantum and classical states remains challenging, with the toolkit still in its infancy. In this perspective, we discuss methods, challenges, and opportunities for the creation, detection, and control of multiple DoFs for higher-dimensional structured light. We present a roadmap for future development trends, from fundamental research to applications, concentrating on the potential for larger-capacity, higher-security information processing and communication, and beyond.

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Synthetic helical dichroism for six-dimensional optical orbital angular momentum multiplexing

Cited by 144 publications

References 36 publications

Near-perfect fidelity polarization-encoded multilayer optical data storage based on aligned gold nanorods

Near-perfect fidelity polarization-encoded multilayer optical data storage based on aligned gold nanorods

Time diffraction-free transverse orbital angular momentum beams

Towards higher-dimensional structured light

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