| Funding Scheme : |
General Research Fund |
| Project Number : |
14207924 |
| Project Title(English) : |
Integrated Photonic Control of Mode Distribution in Multimode Optical Fiber for Novel Ultra-small Diameter Multimode Fiber Endoscopic Imaging System |
| Project Title(Chinese) : |
用於新型超小直徑多模光纖內窺鏡成像系統的多模光纖中模式分佈的集成光學控制 |
| Principal Investigator(English) : |
Prof Tsang, Hon Ki |
| Principal Investigator(Chinese) : |
曾漢奇 |
| Department : |
Dept of Electronic Engineering |
| Institution : |
The Chinese University of Hong Kong |
| Co - Investigator(s) : |
|
| Panel : |
Engineering |
| Subject Area : |
Electrical & Electronic Engineering |
| Exercise Year : |
2024 / 25 |
| Fund Approved : |
1,133,254 |
| Project Status : |
On-going
|
| Completion Date : |
31-12-2027 |
Abstract as per original application
(English/Chinese): |
Endoscopic imaging is widely used clinically but is limited by the relatively large diameters, of the order of millimeters, of even the thinnest endoscopes currently available, that prevent the endoscope from accessing difficult to reach organs like the brain or inner cochlea. The development of endoscopes which are one order of magnitude smaller in diameter than the ones available today can increase the clinical applications of endoscopes, such as for deep brain imaging, while reducing the damage and pain experienced by patients in more conventional applications such as transnasal and transoral endoscopy. The use of multimode optical fibers for imaging has the potential to reduce the diameter of endoscopes by an order of magnitude, to less than 0.2mm diameter. Multimode optical fibers for endoscopic imaging have therefore attracted much research in recent years and impressive imaging performances have been demonstrated using bulk optical components and spatial light modulators at the proximal end of the fiber in order to engineer the wavefront of light at the distal end of the multimode fiber and achieve high resolution imaging. However such demonstrations are unsuited for clinical applications because they rely on bulk optics and free-space aligned beams which are sensitive to mechanical vibrations that perturb the position of mirrors or lenses, so that the demonstrations are typically built on vibration-free optical benches. In this project we propose the development of a photonic integrated circuit (PIC) which integrates all the necessary components for the multimode fiber imaging system on a silicon chip. We shall implement the system using the silicon photonics chip fabrication services offered by commercial foundries for the integration of phase shifters, mode multiplexers and photodetectors. Our proposed approach will realize a robust, vibration insensitive and high-resolution multimode fiber imaging system. We shall tackle the basic challenge of how to couple light between the multimode fiber and the photonic integrated circuit using grating based optical nanoantenna array, and we shall develop the algorithms for the control of the high-speed phase shifters on the PIC and the compressive imaging reconstruction algorithms using the light reflected back into the multimode optical fiber to achieve high-resolution imaging. The proposed development of the PIC for multimode fiber imaging systems will enable a robust and ultra-small (less than 0.3mm diameter) high-resolution endoscopic imaging system, which will reduce the diameter of endoscopes by more than an order of magnitude and expand the possible applications of endoscopic imaging.
內窺鏡成像在臨床上具有廣泛的應用。但是，目前即使是最細的內窺鏡，其直徑也在毫米級別，這限制了內窺鏡在體內難以到達的器官，例如大腦或內耳蜗，中的應用。開發比現有內窺鏡直徑小一個數量級的新型內窺鏡可以增加其臨床應用，例如深部腦成像。同時在更傳統的應用，如經鼻或經口內窺鏡檢查中，可以減少病人的損傷與疼痛。使用多模光纖進行成像有可能將內窺鏡的直徑減小一個數量級，最小可以到達0.2毫米。因此，近年來湧現了許多關於多模光纖內窺鏡成像的研究。研究人員們利用空間光學元件以及空間光調制器在光纖的近端進行波前整形，以實現在多模光纖的遠端實現高分辨率的成像。然而，這些演示並不適用於臨床應用，因為他們依賴於空間光學以及自由空間中光束的對準。這樣的系統對會擾動反射鏡與透鏡位置的機械振動十分敏感，因此這些演示通常在無震動的光學平台實現。在這個項目中，我們提出開發一種光子集成電路（PIC），將多模光纖成像系統所需的所有組件集成在一個硅芯片上。我們將利用商業晶圓廠提供的硅光子芯片製造服務來集成相移器、模式復用器和光探測器。我們提出的方法將實現一個穩定的、對震動不敏感的高分辨率多模光纖成像系統。我們將著力解決關於如何使用基於光柵的光學納米天線陣列實現多模光纖和PIC之間光學耦合的基本問題，並將開發用於驅動PIC上的高速相移器的控制算法和利用反射回多模光纖的光進行壓縮成像的圖像重建算法，以實現高分辨率成像。我們提出的用於多模光纖成像系統的光子集成電路的開發，將實現一個穩定且超小（直徑小於0.3毫米）的高分辨率內窺鏡成像系統，將內窺鏡的直徑減小超過一個數量級，並拓展內窺鏡成像的可能應用。
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| Research Outcome |
Layman's Summary of
Completion Report: |
Not yet submitted
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