Sökning: "multiple wavelength bands"

Visar resultat 1 - 5 av 6 uppsatser innehållade orden multiple wavelength bands.

1. 1. Modulation of the optical properties of quantum dots by surface acoustic waves

   Master-uppsats, KTH/Tillämpad fysik

   Författare :Tanguy Schetelat; [2023]
   Nyckelord :Nanophotonics; Quantum dots; Surface acoustic waves; Interdigital tansducers; Optomechanical coupling; Nanofotonik; Kvantprickar; Akustika yt-vågor; Interdigital tansducers; Optomekanisk koppling;

   Sammanfattning : Semiconductor quantum dots (QDs) are considered to be a crucial part of future quantum technologies due to their enormous potential as efficient sources of single and indistinguishable photons. Single photons are necessary to transport quantum information over large distances through the existing global fibre optic network. LÄS MER

3. 2. Tracking Under Countermeasures Using Infrared Imagery

   Master-uppsats, Linköpings universitet/Datorseende

   Författare :Sara Modorato; [2022]
   Nyckelord :computer vision; infrared imagery; tracking; countermeasures; discriminative correlation filters; Efficient Convolution Operator tracker; Spatial-Temporal Regularized Correlation Filter tracker; Visual Object Tracking; flare; DIRCM; multiple wavelength bands; features;

   Sammanfattning : Object tracking can be done in numerous ways, where the goal is to track a target through all frames in a sequence. The ground truth bounding box is used to initialize the object tracking algorithm. Object tracking can be carried out on infrared imagery suitable for military applications to execute tracking even without illumination. LÄS MER

4. 3. The use of graphene quantum dots as detection elements in nanomaterials-based sensors for forensic applications

   Master-uppsats, KTH/Tillämpad fysik

   Författare :Xiaofan Ma; [2021]
   Nyckelord :Graphene Quantum Dots; Amphetamine; Cocaine; Chemical Sensor; Forensic Drugs; Grafenkvantprickar; amfetamin; kokain; kemisk sensor; rättsmedicinska läkemedel;

   Sammanfattning : The large-scale abuse and addiction of narcotics such as amphetamine and cocaine have become a global problem. In this project, we innovatively use graphene quantum dots (GQDs) as a fluorescent sensor to detect and quantify amphetamine and cocaine. This technology will have broad forensic application prospects. LÄS MER

5. 4. Stacked Dual Narrowband Organic Near-Infrared Photodetectors

   Master-uppsats, Linköpings universitet/Institutionen för fysik, kemi och biologi

   Författare :Yazhong Wang; [2017]
   Nyckelord :Near-infrared; photodetectors; CT states; Fabry-Perot resonant cavity; resonant cavity enhancement; tunability; full width at half maximum;

   Sammanfattning : Compared with the detector devices made of inorganic semiconductors, organic photodetectors are granted with additional strengths, such as flexibility, high scalability and bio-compatibility. However, in the family of organic optoelectronic devices, the detectors that are capable of detecting photons at two or multiple specific wavelengths are still missing. LÄS MER

7. 5. Ray-tracing based analysis of channel characteristics and capacity improvement capabilities of spatial multiplexing and beamforming at 15 and 28 GHz

   Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

   Författare :Qingbi Liao; [2016]
   Nyckelord :5G; 15 GHz; 28 GHz; beamforming; capacity; channel multiplexing richness; hybrid beamforming; MIMO; mm-Wave; ray-tracing; spatial multiplexing; Technology and Engineering;

   Sammanfattning : In the previous decades, mm-Wave frequency bands have largely been ignored for cellular communication because of the high free space attenuation as well as the cost and complexity of mm-Wave RF circuits. However, with the improvement of RF and antenna technologies over the last decade, it has become feasible to con- sider mm-Wave bands for cellular communications. LÄS MER