Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Department of Applied Physics | en_US |
| dc.creator | Jiang, Heng | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/13596 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | en_US |
| dc.rights | All rights reserved | en_US |
| dc.title | Optical-fibre-based biomimetic artificial compound eyes | en_US |
| dcterms.abstract | Natural selection has driven arthropods to evolve fantastic natural compound eyes (NCEs) with unique anatomical structures, providing a promising blueprint for artificial compound eyes (ACEs) to perceive complex environments. NCEs have two main types – apposition and superposition – adapted for daytime and nighttime vision respectively. However, traditional ACEs have mostly been able to mimic only the apposition type, and have difficulties in achieving both static imaging and dynamic perception simultaneously. To address these limitations, this PhD research has developed two types of biomimetic ACEs that faithfully replicate the structures of NCEs. The thesis consists of three main parts: | en_US |
| dcterms.abstract | The first part focuses on a novel artificial ommatidium, which is the basic imaging unit of ACEs. It is designed and fabricated using a conical-microlens plastic optical fibre, serving as flexible and nonbrittle light guides to collect and transmit light from a curved light detection surface to a flat imaging sensor chip. The conical microlens with a 35° half-apex angle and a rounded tip enables to lower the acceptance angle and improve the angular resolution of the plastic optical fibres. And a unique fabrication technique is developed using 3D printing, electroplating, and moulding processes to produce ~200 artificial ommatidia in a batch. | en_US |
| dcterms.abstract | The second part is devoted to a novel apposition ACE, which is assembled using 271 artificial ommatidia. This ACE mimics the key anatomical structures of NCEs, including the facet lens, crystalline cone, rhabdom, and pigment cells. It demonstrated exceptional capabilities, such as a 180° field of view, real-time panoramic direct imaging without distortions, and the ability to detect ultrafast angular motion up to 100 times faster than the response speed of dragonflies. | en_US |
| dcterms.abstract | The third part turns to a new optic superposition ACE using the artificial ommatidia again but having a different arrangement. This ACE incorporates spatial and temporal adjustments in both hardware and software to perform well under 1000 times varying light intensities, including focus mode switching, binning mode, Gaussian spatial summation, and exposure time lengthening. The precise mimicry of NCE archetypes and anatomical structures enabled the superposition ACE to meet the requirements for both static and dynamic perception. | en_US |
| dcterms.abstract | In summary, this thesis makes significant scientific contributions by developing exceptional biomimetic ACEs that faithfully replicate the anatomical structures of NCEs. The novel conical-microlens plastic optical fibres enable effective light transmission from curved to flat surfaces. The meticulously assembled apposition and superposition ACEs demonstrate unprecedented capabilities, outperforming natural systems in key metrics such as field of view, imaging speed, and motion detection. These remarkable biomimetic characteristics could facilitate applications of ACEs in emerging fields such as surveillance, unmanned drones, medical imaging, autonomous driving, and virtual reality. | en_US |
| dcterms.extent | xv, 159 pages : color illustrations | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2025 | en_US |
| dcterms.educationalLevel | Ph.D. | en_US |
| dcterms.educationalLevel | All Doctorate | en_US |
| dcterms.LCSH | Compound eye -- Physiology | en_US |
| dcterms.LCSH | Photoreceptors | en_US |
| dcterms.LCSH | Eyes, Artificial | en_US |
| dcterms.LCSH | Hong Kong Polytechnic University -- Dissertations | en_US |
| dcterms.accessRights | open access | en_US |
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