Polymer waveguide switch using liquid-crystal overlayer

Chuang, Wei‐Ching; Lin, Jin-Shin; Lee, Kun‐Yi; Lee, Wei-Yu

doi:10.1117/12.305435

Cited by 8 publications

(11 citation statements)

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“…The optical gain spectra of quantum well architecture with the valence band intermixing effect being considered is calculated using the following expression [11]:…”

Section: Methodsmentioning

confidence: 99%

“…As a result, the orientation of the growing quantum well can be utilized as a new parameter to further improve the differential gain of the active region. Specifically, for VCSELs, the arbitrary crystal orientation can be grown without the restriction of the natural cleavage plane [11]. The energy band dispersion of a compressed strain QW strongly depends on the crystal orientation.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Optical and Photoelectric Properties for 850 nm VCSELs with Arbitrary Crystal Orientation

Zhao²,

Gao³

2022

Crystals

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High-speed VCSELs are widely used for high-capacity, short-range data communication links. Here, we numerically investigate the optical and electronic properties of a crystal orientation-dependent 1.06% compression InGaAs-AlGaAs laser emitting around 850 nm. The reduction of the density of states is observed in the largest energy range for the quantum well in the (110) orientation compared with the conventional (001) orientation. The calculated transparency carrier density decreases from 2.74 × 1018 cm−3 to 1.88 × 1018 cm−3 with the gain coefficient rising from 4969.4 cm−1 to 5427.2 cm−1 in (110) orientation. The 3 dB bandwidth of 31.25 GHz is realized in the (110) orientation, which can support 60 Gbps (NRZ) applications.

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“…The optical gain spectra of quantum well architecture with the valence band intermixing effect being considered is calculated using the following expression [11]:…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Optical and Photoelectric Properties for 850 nm VCSELs with Arbitrary Crystal Orientation

Zhao²,

Gao³

2022

Crystals

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“…Mn 5 Ge 3 /n-Ge Schottky diodes serve as a good analogue for estimating the barrier height for Mn 5 Ge 3 /Ge in our Ge/SiGe heterostructure devices. Ideally, there would be an increase in barrier height due to the compressive strain of the Ge quantum well moving both the conduction and valence band edges farther apart [38,39]. However, Ge is widely known to pin the Fermi levels of most metals very close to the valence band edge, thus nullifying any effects due to strain in the case of hole transport.…”

Section: Electrical Characterizationmentioning

confidence: 99%

Characterization of Mn5Ge3 Contacts on a Shallow Ge/SiGe Heterostructure

Hutchins-Delgado,

Addamane,

et al. 2024

Nanomaterials

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Mn5Ge3 is a ferromagnetic phase of the Mn-Ge system that is a potential contact material for efficient spin injection and detection. Here, we investigate the creation of Mn5Ge3-based contacts on a Ge/SiGe quantum well heterostructure via solid-state synthesis. X-ray diffraction spectra fitting indicates the formation of Mn5Ge3-based contacts on bulk Ge and Ge/SiGe. High-resolution scanning transmission electron microscopy imaging and energy dispersive X-ray spectroscopy verify the correct Mn5Ge3-based phase formation. Schottky diode measurements, transmission line measurements, and Hall measurements reveal that Mn5Ge3-based contacts serve as good p-type contacts for Ge/SiGe quantum well heterostructures due to having a low Schottky barrier height of 0.10eV (extracted from a Mn5Ge3/n-Ge analogue) and a contact resistance in the order of 1 kΩ. Furthermore, we show that these electrical characteristics have a gate-voltage dependence, thereby providing tunability.

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“…The refractive index (RI) sensor based on an optical waveguide has been extensively used in chemical or biological detection [1][2][3]. In terms of the operating principle of optical waveguide sensing technology, the light propagates via the optical waveguide substrate.…”

Section: Introductionmentioning

confidence: 99%

“…Fortunately, increasing the content of the capture molecule in the biosensor is conducive to increasing the sensitivity of biological detection [32][33][34]. Graphene oxide (GO) is a derivate of graphene, which is one-atom thick and has a 2D structure, comprising sp 2 and sp 3 -hybridized carbon atoms and such functional groups as carboxylic acid (O=C-OH), hydroxy (C-OH), phenol, and epoxyl (C-O-C) [35,36]. As the carboxylic acid is distributed over the surface edge, the phenolic hydroxyl and epoxyl exist in the basal plane.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Highly Sensitive Carboxyl-Graphene Oxide-Based Planar Optical Waveguide Localized Surface Plasmon Resonance Biosensor

Chen

Chiang

2022

Nanomaterials

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This study develops a highly sensitive and low-cost carboxyl-graphene-oxide-based planar optical waveguide localized surface plasmon resonance biosensor (GO-OW LSPR biosensor), a system based on measuring light intensity changes. The structure of the sensing chip comprises an optical waveguide (OW)-slide glass and microfluidic-poly (methyl methacrylate) (PMMA) substrate, and the OW-slide glass surface-modified gold nanoparticle (AuNP) combined with graphene oxide (GO). As the GO has an abundant carboxyl group (–COOH), the number of capture molecules can be increased. The refractive index sensing system uses silver-coated reflective film to compare the refractive index sensitivity of the GO-OW LSPR biosensor to increase the refractive index sensitivity. The result shows that the signal variation of the system with the silver-coated reflective film is 1.57 times that of the system without the silver-coated reflective film. The refractive index sensitivity is 5.48 RIU−1 and the sensor resolution is 2.52 ± 0.23 × 10−6 RIU. The biochemical sensing experiment performs immunoglobulin G (IgG) and streptavidin detection. The limits of detection of the sensor for IgG and streptavidin are calculated to be 23.41 ± 1.54 pg/mL and 5.18 ± 0.50 pg/mL, respectively. The coefficient of variation (CV) of the repeatability experiment (sample numbers = 3) is smaller than 10.6%. In addition, the affinity constants of the sensor for anti-IgG/IgG and biotin/streptavidin are estimated to be 1.06 × 107 M−1 and 7.30 × 109 M−1, respectively. The result shows that the GO-OW LSPR biosensor has good repeatability and very low detection sensitivity. It can be used for detecting low concentrations or small biomolecules in the future.

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Polymer waveguide switch using liquid-crystal overlayer

Cited by 8 publications

References 0 publications

Numerical Investigation of Optical and Photoelectric Properties for 850 nm VCSELs with Arbitrary Crystal Orientation

Numerical Investigation of Optical and Photoelectric Properties for 850 nm VCSELs with Arbitrary Crystal Orientation

Characterization of Mn5Ge3 Contacts on a Shallow Ge/SiGe Heterostructure

Determination of the Highly Sensitive Carboxyl-Graphene Oxide-Based Planar Optical Waveguide Localized Surface Plasmon Resonance Biosensor

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