Real-space measurement of the potential distribution inside organic semiconductors

We demonstrate that the soft nature of organic semiconductors can be exploited to directly measure the potential distribution inside such an organic layer by scanning-tunneling microscope (STM) based spectroscopy. Keeping the STM feedback system active while reducing the tip-sample bias forces the tip to penetrate the organic layer. From an analysis of the injection and bulk transport processes it follows that the tip height versus bias trace obtained in this way directly reflects the potential distribution in the organic layer

All-optical on-chip sensor for high refractive index sensing

Contains fulltext : 140137.pdf (publisher's version ) (Open Access

High-frequency phonon experiments with superconductive films

Contains fulltext : mmubn000001_025264796.pdf (publisher's version ) (Open Access)Promotor : P. Wyder[VIII], 97 p

Mind the gap

Applied Science

Lidar measurement technique in environmental research

De ontwikkeling van de menglaaghoogte kan zeer wel met lidar gevolgd worden. De resultaten komen overeen met die verkregen met een klassieke acdar-opstelling. Het nadeel van acdar is echter dat deze de menglaaghoogte tot maximaal 600 m kan volgen, terwijl lidar een bereik van 3 km ruimschoots overtreft. Dit grotere bereik van lidar is des te meer van belang als men gedenkt dat grootschalige transporten van luchtverontreiniging meestentijds op hoogten tussen 500 en 1500 m plaatsvinden. Met behulp van een lidar-systeem ingebouwd in een meetauto, kan zowel de kleinschalige verspreiding van luchtverontreiniging vanuit een geisoleerde schoorsteen (bv. elektriciteitscentrale) als de grootschalige verspreiding vanuit een complex industrieel brongebied routinematig gevolgd worden.Abstract not availableDGMH/LRIV

Real-time dynamic sensing with an on-chip nanophotonic sensor

Contains fulltext : 176662.pdf (publisher's version ) (Open Access

Pair breaking in strong-coupling superconductors

Contains fulltext : 91258.pdf (publisher's version ) (Open Access

Planarized nanophotonic sensor for real-time fluid sensing

A planarized on-chip nanophotonic sensor based on a photonic crystal cavity is realized in this work. The sensor was embedded in a solid protecting material (flowable oxide) with perfect filled holes: this eliminates problems of fouling in practical applications. The functional area of the sensor is created by carefully removing the protecting material only on the top surface of the cavity. A wavelength shift of 7.5 nm was observed in experiment which is very close to a simulation result of 9.0 nm for sensing water (n=1.33) and crude oil (n=1.45) samples. Swift and accurate sensing was verified by a real-time dynamic measurement with rapidly alternating analytes in a microfluid channel.Petroleum Engineerin

Tunneling spectroscopy at nanometer scale in MBE-grown (Al)GaAs multilayers

no abstrac