本文介绍了红外感知技术在“向上看”的深空探测与“向下看”的对地观测两大领域的发展脉络和前沿挑战。在深空探测方面,以詹姆斯·韦布空间望远镜(James Webb Space Telescope, JWST)为代表,该技术正通过超大口径、甚长波段和超低...本文介绍了红外感知技术在“向上看”的深空探测与“向下看”的对地观测两大领域的发展脉络和前沿挑战。在深空探测方面,以詹姆斯·韦布空间望远镜(James Webb Space Telescope, JWST)为代表,该技术正通过超大口径、甚长波段和超低温制冷等手段,不断逼近观测的物理极限,并致力于揭示宇宙早期的历史奥秘。阐述了对地观测领域不同时期搭载于各类卫星的红外探测载荷的主要发展过程及其代表性和特色。红外对地观测技术从过去宽幅下的低空间分辨率和少量波段,向着空谱大范围下的时-空-谱-辐分辨率提升迈进。大口径低背景光学、长波长高灵敏度探测器、片上智能感知、大数据孪生系统等新型技术,以及通导遥一体的“即时遥感”和商业航天的大规模发展,将助力构建“红外数字地球”底座,增强人类对地球多圈层异常事件以及各种复杂循环过程演变的实时认知和精准预测,推动红外对地观测技术走向大众化应用。展开更多
太赫兹分子指纹谱是一种非常有潜力的无标记检测方法,可以对微量甚至痕量样品进行检测。然而太赫兹波的波长远远大于待测分子的尺寸,导致波与痕量物质之间的相互作用较为微弱,需要额外结构来增强样品对电磁波的吸收。本文在金属基底上...太赫兹分子指纹谱是一种非常有潜力的无标记检测方法,可以对微量甚至痕量样品进行检测。然而太赫兹波的波长远远大于待测分子的尺寸,导致波与痕量物质之间的相互作用较为微弱,需要额外结构来增强样品对电磁波的吸收。本文在金属基底上构造了倒置的非对称介质光栅结构。该结构利用导模共振(Guided-mode resonance,GMR)和连续域束缚态(Bound state In Continuum,BIC)显著提升了薄膜样品的太赫兹吸收谱。该结构仅需测量反射吸收信号就可以得到薄膜增强吸收谱,而且样品涂覆于平坦的倒置的介质光栅背面,易于制备。当该结构用于0.2μm厚的α-乳糖薄膜时,吸收谱幅度增强达到236倍。该结构为太赫兹波段痕量分析物的检测提供了一种新的方法。展开更多
A novel near-infrared all-fiber mode monitor based on a mini-two-path Mach-Zehnder interferometer(MTP-MZI)is proposed.The MTP-MZI mode monitor is created by fusing a section of(no-core fiber,NCF)and a(single-mode fibe...A novel near-infrared all-fiber mode monitor based on a mini-two-path Mach-Zehnder interferometer(MTP-MZI)is proposed.The MTP-MZI mode monitor is created by fusing a section of(no-core fiber,NCF)and a(single-mode fiber,SMF)together with an optical fiber fusion splicer,establishing two distinct centimeter-level optical transmission paths.Since the high-order modes in NCF transmit near-infrared light more sensitively to curvature-induced energy leakage than the fundamental mode in SMF,the near-infrared high-order mode light leaks out of NCF when the curvature changes,causing the MTP-MZI transmission spectrum to change.By ana⁃lyzing the relationship between the curvature,transmission spectrum,and spatial frequency spectrum,the modes involved in the interference can be studied,thereby revealing the mode transmission characteristics of near-infra⁃red light in optical fibers.In the verification experiments,higher-order modes were excited by inserting a novel hollow-core fiber(HCF)into the MTP-MZI.When the curvature of the MTP-MZI changes,the near-infrared light high-order mode introduced into the device leaks out,causing the transmission spectrum to return to its origi⁃nal state before bending and before the HCF was spliced.The experimental results demonstrate that the MTP-MZI mode monitor can monitor the fiber modes introduced from the external environment,providing both theoretical and experimental foundations for near-infrared all-fiber mode monitoring in optical information systems.展开更多
文摘本文介绍了红外感知技术在“向上看”的深空探测与“向下看”的对地观测两大领域的发展脉络和前沿挑战。在深空探测方面,以詹姆斯·韦布空间望远镜(James Webb Space Telescope, JWST)为代表,该技术正通过超大口径、甚长波段和超低温制冷等手段,不断逼近观测的物理极限,并致力于揭示宇宙早期的历史奥秘。阐述了对地观测领域不同时期搭载于各类卫星的红外探测载荷的主要发展过程及其代表性和特色。红外对地观测技术从过去宽幅下的低空间分辨率和少量波段,向着空谱大范围下的时-空-谱-辐分辨率提升迈进。大口径低背景光学、长波长高灵敏度探测器、片上智能感知、大数据孪生系统等新型技术,以及通导遥一体的“即时遥感”和商业航天的大规模发展,将助力构建“红外数字地球”底座,增强人类对地球多圈层异常事件以及各种复杂循环过程演变的实时认知和精准预测,推动红外对地观测技术走向大众化应用。
文摘太赫兹分子指纹谱是一种非常有潜力的无标记检测方法,可以对微量甚至痕量样品进行检测。然而太赫兹波的波长远远大于待测分子的尺寸,导致波与痕量物质之间的相互作用较为微弱,需要额外结构来增强样品对电磁波的吸收。本文在金属基底上构造了倒置的非对称介质光栅结构。该结构利用导模共振(Guided-mode resonance,GMR)和连续域束缚态(Bound state In Continuum,BIC)显著提升了薄膜样品的太赫兹吸收谱。该结构仅需测量反射吸收信号就可以得到薄膜增强吸收谱,而且样品涂覆于平坦的倒置的介质光栅背面,易于制备。当该结构用于0.2μm厚的α-乳糖薄膜时,吸收谱幅度增强达到236倍。该结构为太赫兹波段痕量分析物的检测提供了一种新的方法。
基金Supported by the Central Government Guidance on Local Science and Technology Development Funds(2023ZY1023)the Six Talent Peaks Project in Jiangsu Province(KTHY-052).
文摘A novel near-infrared all-fiber mode monitor based on a mini-two-path Mach-Zehnder interferometer(MTP-MZI)is proposed.The MTP-MZI mode monitor is created by fusing a section of(no-core fiber,NCF)and a(single-mode fiber,SMF)together with an optical fiber fusion splicer,establishing two distinct centimeter-level optical transmission paths.Since the high-order modes in NCF transmit near-infrared light more sensitively to curvature-induced energy leakage than the fundamental mode in SMF,the near-infrared high-order mode light leaks out of NCF when the curvature changes,causing the MTP-MZI transmission spectrum to change.By ana⁃lyzing the relationship between the curvature,transmission spectrum,and spatial frequency spectrum,the modes involved in the interference can be studied,thereby revealing the mode transmission characteristics of near-infra⁃red light in optical fibers.In the verification experiments,higher-order modes were excited by inserting a novel hollow-core fiber(HCF)into the MTP-MZI.When the curvature of the MTP-MZI changes,the near-infrared light high-order mode introduced into the device leaks out,causing the transmission spectrum to return to its origi⁃nal state before bending and before the HCF was spliced.The experimental results demonstrate that the MTP-MZI mode monitor can monitor the fiber modes introduced from the external environment,providing both theoretical and experimental foundations for near-infrared all-fiber mode monitoring in optical information systems.
