共查询到20条相似文献，搜索用时 15 毫秒
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Bernhard Lamprecht Elke Kraker Martin Sagmeister Stefan Köstler Nicole Galler Harald Ditlbacher Birgit Ungerböck Tobias Abel Torsten Mayr 《固体物理学:研究快报》2011,5(9):344-346
We present a novel optical sensor platform, combining monolithically integrated ring‐like sensor waveguides together with ring‐shaped thin‐film organic photodiodes (OPDs) on one substrate. The OPDs serve as integrated light detectors, simplifying the detection system by minimizing the number of required optical components. The waveguide structures, including a means of coupling light in and out of the waveguides, serve as sensing elements. The functionality of the concept is demonstrated by an integrated carbon dioxide sensor, utilizing absorbance as sensing principle. The integrated optical sensor platform is suitable for the parallel detection of multiple parameters in a single sensor chip using sensor arrays. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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Hye Ryun Sim Mingyun Kang Seong Hoon Yu Geon-Hee Nam Bogyu Lim Dae Sung Chung 《Advanced Optical Materials》2021,9(4):2001836
Photomultiplication-type organic photodiodes (PM-OPDs) rely on acceptor molecules for both charge separation and efficient gain generation. Herein, a new non-fullerene acceptor is designed and synthesized by introducing thienylenevinylene (TV) groups into the conventional 2,2ʹ-[[6,6,12,12-tetrakis(4-hexylphenyl)-6,12-dihydrodithieno[2,3-d:2ʹ,3ʹ-dʹ]-s-indaceno[1,2-b:5,6-bʹ]dithiophene-2,8-diyl]bis[methylidyne(3-oxo-1H-indene-2,1(3H)-diylidene)]]bis[propanedinitrile] (ITIC) structure. The resulting TV-ITIC acceptor possesses not only extended π-conjugation length, which leads to lower energy bandgap as well as deeper lowest unoccupied molecular orbital (LUMO) level, but also enhanced hydrophobic characteristics, owing to the increased volumetric portion of the aliphatic chain, which improves the miscibility with the donor polymer semiconductor, poly(3-hexylthiophene-2,5-diyl) (P3HT). Moreover, pristine TV-ITIC films consist of intrinsically well-ordered anisotropic crystallites, which are confirmed by 2D grazing incidence X-ray diffraction (2D-GIXD) analysis. All of these photophysical properties are beneficial for efficient exciton separation, electron trapping, and charge injection abilities of PM-OPDs compared to those obtained with conventional ITIC. Because of such synergetic contributions of TV-ITIC to the photomultiplication mechanism, the resulting optimized PM-OPD exhibits a high external quantum efficiency (>74,000%) and a large specific detectivity (>1012 Jones). 相似文献
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Abstract A low-noise wideband optical fiber receiver has been successfully designed using super-beta bipolar transistors (BJTs) at the front end. Even with commercially available super-beta devices, which are not optimized for our application, the obtainable input sensitivity for medium- and high-bandwidth optical receivers is comparable or superior to the best FET design. To demonstrate this concept, a 10-MHz analog receiver was built with a super-beta BJT at the input stage. This receiver achieved an expected average input noise current density of less than 0.4 PA/√Hz over the full bandwidth for a transresistance of 500 kΩ. Detailed design procedures are given in this paper. The noise characteristics of a 50-MHz receiver using super-beta BJTs are also obtained. 相似文献
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A. D'Orazio M. de Sario G. Ficarella D. Grando V. Petruzzelli F. Prudenzano 《Fiber and Integrated Optics》1997,16(4):369-386
The design of an integrated optic Michelson interferometer sensor for stress, temperature, and microdisplacement measurements consisting of a semi-asymmetric X-junction made by Ti in-diffused LiNbO3 waveguides is reported. The possibility of performing simultaneous measurements of strain and temperature is investigated, and different calibration schemes are proposed. Experimental results of displacement-only measurements show a 64% intensity modulation with 33-dB optical loss. 相似文献
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Photodetectors that convert a light signal into an electrical signal have wide applications in light signal detection. As an emerging candidate for next‐generation light sensing, organic photodetectors compensate well for the shortages of the traditional inorganic photodetectors in terms of ease of processing, compatibility with flexible substrates, tunable absorption characteristics, low‐cost manufacturing, and being lightweight. Currently, regular improvements in organic photodetectors are made with respect to their important figure‐of‐merit performances, which have caught up to or even surpassed the performances of inorganic Si and Ge‐based photodetectors. Importantly, the spectral response of organic photodetectors covers a wide range of wavelengths, from the ultraviolet to near‐infrared regions, with low‐band‐gap organic semiconductors as the active medium. In this paper, the working mechanism and recent advances in organic semiconductor photodetectors are comprehensively reviewed and the challenges in the field, mainly focusing on the performance of organic photodetectors, studies oriented toward applications, and the expectations of organic semiconductor photodetectors in the future, are disclosed. 相似文献
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Optical surface plasmon resonance (SPR) excitation can be theoretically depicted and discussed using Fresnel’s equations.
However, Fresnel’s equations cannot explicitly give expressions to reflect the characteristics of SPR systems, especially
in SPR optical waveguide and fibre-optic sensors. In this paper a mathematical model based on the approximation proposed by
Kretschmann in bulk optics is presented to describe the characteristics of SPR optical waveguide and fibre-optic sensors.
The results show that the model keeps high accuracy when used in the area close to the minimum reflection, at which the resonance
condition is achieved. This model can be used to analytically estimate the performance of SPR optical waveguide sensors, and
SPR fibre-optic sensors in meridional rays approximation. 相似文献
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《Laser u0026amp; Photonics Reviews》2017,11(6)
Optical polymers are a promising material of choice in the development of hybrid silicon photonics devices. Particularly, recent progress in electro‐optic (EO) active polymers has shown a strong Pockels effect. A ring resonator modulator is a vital building block for practical applications, such as signal processing, routing, and monitoring. However, the properties of the hybrid silicon and EO polymer ring modulators are still far from their theoretical limits. Here, we demonstrate a unique design of a hybrid ring resonator modulator simply located onto a silicon‐on‐insulator (SOI) substrate. Extra doping and etching of the SOI wafer is not required, even so we measured an in‐device electro‐optic coefficient r33 = 129 pm/V. The ring modulator exhibited a high sensitivity of the electrically tunable resonance, which enabled a 3 dB bandwidth of up to 18 GHz. The proposed technique will enable efficient mass‐production of the micro‐footprint modulators and promote the development of integrated silicon photonics. 相似文献
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D'Orazio A. Desario M. Giasi C. Mescia L. Petruzzelli V. Prudenzano F. 《Optical and Quantum Electronics》2004,36(6):507-526
A realistic design of evanescent field optical sensors, constituted by three different kinds of planar waveguides covered
by a sensing polymeric overlay, is performed. More precisely, the slab, the embedded strip and the ridge waveguides are considered.
The sensor operation is simulated, in both the cases of lossy guided and leaky mode propagation, via a home made computer code. The optimal waveguide transverse section and length are identified, the advantages and drawbacks
are shown. The ridge waveguide sensor exhibits appreciable characteristics: for a concentration C
w = 200 ppm of toluene in water, the absorbance pertaining to a device L = 2.6 cm long and for the guided quasi-TE00 mode is A ≅ 5, while it is A ≅ 0.054 for a device long L ≅ 24.1 μm and the leaky quasi-TE10 mode. The simulation results suggest that a selective excitation of the suitable propagation mode can enhance the sensor
performance. 相似文献
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A simple solution of an inverse problem of reconstruction of thickness, permittivity and surface coverage of an adlayer disposed on the surface of a channel optical waveguide is proposed and substantiated theoretically. It is shown that the reconstruction errors for the parameters of the adlayer can be minimized by a choice of the channel waveguide parameters. The application of the procedure to biochemical sensors is considered. 相似文献
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《Advanced Optical Materials》2018,6(4)
A high‐performance red‐selective thin‐film organic photodiode (OPD) is designed. Dual‐band absorbing poly[(2,5‐bis(2‐hexyldecyloxy)phenylene)‐alt‐(5,6‐difluoro‐4,7‐di(thiophen‐2‐yl)benzo[c][1,2,5]‐thiadiazole)] (PPDT2FBT) is introduced as the photoactive donor layer of a planar heterojunction OPD in conjunction with a sol–gel synthesized ZnO acceptor layer. The active layer thickness is systematically controlled to suppress band II absorption (λmax = 420 nm) of PPDT2FBT without sacrificing band I absorption (λmax = 650 nm). The optimal PPDT2FBT thickness is 320 nm to realize red‐selective absorption while maintaining the low dark current density of the OPD (predicted by optical simulation conducted using the transfer matrix method). In addition, the introduction of ZnO (with a strategically determined thickness) as an acceptor layer in front of PPDT2FBT in an illumination pathway enables further suppression of band II absorption because of the blue color filter effect. Consequently, the resulting OPD with a device architecture of indium tin oxide/ZnO/PPDT2FBT/MoO3/Ag shows an outstanding red‐selective photodiode performance with peak detectivity up to 3.04 × 1012 Jones and a high linear dynamic range of 116 dB. 相似文献
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The paper provides theoretical analysis of planar antiresonant reflecting optical waveguides (ARROWs) with thin cores. It is shown that the appropriate choice of the cladding system parameters enables fabrication of thin-core ARROWs with all desired properties, such as low-loss single-mode operation and high refractive-index sensitivity of ARROW mode attenuation. 相似文献
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Lluí as Torner Concepci an Santos Juan P. Torres Dumitru Mihalache 《Fiber and Integrated Optics》1994,13(3):271-280
The existence of new hybrid waveguide modes of properly tailored integrated optical waveguides consisting of ultrathin films clad by positive birefringent media is pointed out. 相似文献
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提出了由十字连通形环形谐振腔耦合两个金属-介质-金属(metal-insulator-metal, MIM)波导的结构,并用有限元法数值研究了表面等离极化激元在结构中的传输特性.通过对透射谱的研究,系统地分析了MIM结构的传感特性.结果表明,在透射光谱中有三个共振峰,即存在三种共振模式,其中透射峰与材料的折射率呈线性关系.通过对结构参数的优化,得到了折射率灵敏度(S)高达1500 nm/RIU的理论值,相应的传感分辨率为1.33×10~(-4)RIU.更重要的是,灵敏度不受结构参数变化的影响,这意味着传感器的灵敏度不受制造偏差的影响.此外,谐振波长与环形腔中心半径成线性关系,该器件在较大波长范围内实现可调谐带通滤波.透射强度随着波导与环形腔间距的增大而减小,透射带宽同时减小,因此,可以通过控制环形腔与波导的耦合距离来调谐透射强度及透射带宽.研究结果对高灵敏度纳米级折射率传感器和带通滤波器的设计以及在生物传感器方面的应用都具有一定的指导意义. 相似文献
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Ardalan Armin Mike Hambsch Il Ku Kim Paul L Burn Paul Meredith Ebinazar B Namdas 《Laser u0026amp; Photonics Reviews》2014,8(6):924-932
Inorganic semiconductor‐based broadband photodetectors are ubiquitous in imaging technologies such as digital cameras and photometers. Herein a broadband organic photodiode (OPD) that has performance metrics comparable or superior to inorganic photodiodes over the same spectral range is reported. The photodiode with an active layer comprised of a poly[N‐9′‐heptadecanyl‐2,7‐carbazole‐alt‐5,5‐(4′,7′‐di‐2‐thienyl‐2′,1′,3′‐benzothiadiazole)]:[6,6]‐phenyl‐C71‐butyric acid methyl ester bulk heterojunction blend had a dark current < 1 nA/cm2, specific detectivity of ∼1013 Jones, reverse bias −3 dB frequency response of 100 kHz to 1 MHz, and state‐of‐the‐art Linear Dynamic Range for organic photodiodes of nine orders of magnitude (180 dB). The key to these performance metrics was the use of a thick junction (700 nm), which flattened the spectral response, reduced the dark current and decreased performance variations. The strategy also provides a route to large area defect free “monolithic” structures for low noise integrated photo‐sensing, position determination, or contact, non‐focal imaging. 相似文献
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