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- 저자 : Liang Haowen (검색결과 2 건)
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Liu Xiaodi,Huang Hongxin,Zhou Yongle,Liang Haowen,Li Juntao 한국물리학회 2024 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.85 No.1
In recent years, remarkable progress has been achieved in generating multiple orbital angular momentum beams, primarily in classical physics, exemplifed by technologies such as the vertical-cavity surface-emitting laser (VCSEL). However, the study of multiple orbital angular momentum and on-demand single photons using straightforward and efcient methods still faces limitations in the quantum domain. For example, numerous existing methods necessitate a relatively extensive optical path, posing challenges for optical integration. On-chip generation of OAM single photons lacks the versatility to manipulate various degrees of freedom simultaneously. Here, we propose a design that combines quantum dots with metalens. This method integrates phase multiplexing and spatial multiplexing techniques, enabling the generation of multiple single-photon beams with distinct topological charges and spatial separation through a simpler fabrication process. Our simulation results not only introduce a novel design paradigm but also signifcantly advance the ongoing research eforts related to multiple orbital angular momentum and on-demand single photons in the quantum realm.
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Metalens for improving optical coherence tomography
Guo Songming,Feng Weibin,Long Yong,Liu Zhihao,Fu Xiao,Liang Haowen,Li Juntao 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.1
Optical coherence tomography is one of the most attractive new tomographic techniques, especially in the detection and imaging of biological tissues. For the detection and imaging of human corneas, the current ultra-high-resolution optical coherence tomography technology faces the challenge that the depth of focus is too short to scan the entire human cornea in a single amplitude scan. Here, we propose and design a silicon metalens to replace the objective lens in the sample arm of the optical coherence tomography system. In our simulation, a uniform focused beam with a depth of focus of 886 μm, an axial resolution of 3.1 μm and a lateral resolution of 2.2 μm can be generated by the metalens, which is under the excitation of broadband Gaussian light with wavelength coverage from 800 to 900 nm. This metalens fully satisfies the depth of focus and resolution requirements of the ultra-high-resolution optical coherence tomography system for human corneas, hence expands the application of optical coherence tomography in medical science for the benefit of mankind.
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