Fabrication and characterization of shape- and topology-optimized optical cavities with deep sub-wavelength confinement for interfacing with colloidal quantum dots

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology Pub Date : 2025-05-28 DOI:10.1016/j.optlastec.2025.113038

Mohammad Abutoama , Rasmus Ellebæk Christiansen , Adrian Holm Dubré , Meng Xiong , Jesper Mørk , Philip Trøst Kristensen

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Abstract

We employ a combined shape- and topology-optimization strategy to design manufacturable two-dimensional photonic crystal-based optical nanocavities that confine light to length scales well below the resonance wavelength. We present details of the design strategy as well as scanning electron micrographs of the fabricated indium phosphide cavities with a compact footprint of approximately

4.5 λ \times 4.5 λ

, which feature gaps on the order of 10 nm and a theoretical mode volume in the gap center below

{0.1 (λ / 2 n_{air})}^{3}

. Subsequent optical characterization of the far-field emission as well as Purcell-enhanced photoluminescence from the cavities with and without spin-coated colloidal quantum dots are compared to numerical simulations and reveal an interesting interplay of two spectrally adjacent modes. The results corroborate the potential of the fabrication process for ensuring high yield and reliable performance as well as the viability of the material platform for exploring light-matter interaction with colloidal QDs.

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用于胶体量子点界面的深亚波长约束光学腔的形状和拓扑优化的制造和表征

我们采用形状和拓扑优化相结合的策略来设计可制造的二维光子晶体光学纳米腔，将光限制在远低于共振波长的长度尺度上。我们展示了设计策略的细节以及制造的磷化铟腔的扫描电子显微照片，其紧凑的足迹约为4.5λ×4.5λ，其特征是10 nm的间隙和间隙中心的理论模体积低于0.1(λ/2nair)3。随后的远场发射的光学表征以及purcell增强的光致发光的腔有和没有自旋涂层胶体量子点的数值模拟进行了比较，并揭示了两种光谱相邻模式的有趣相互作用。结果证实了该制造工艺在确保高产量和可靠性能方面的潜力，以及探索光物质与胶体量子点相互作用的材料平台的可行性。

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来源期刊

Optics and Laser Technology 物理-光学

CiteScore

8.50

自引率

10.00%

发文量

1060

审稿时长

3.4 months

期刊介绍： Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems