title: Dual-optical-mode near-field scanning optical microscopy.
abstract: The simultaneous operation of near-field scanning optical microscopy (NSOM) in reflection and transmission modes is demonstrated. In the transmission mode, a low-noise, large-area silicon photodetector was mounted between the piezoelectric transducer scanning stage and the sample. In the reflection mode, either a photomultiplier tube or two large-area silicon detectors was used for signal collection. The reflection-mode setup consisting of two silicon detectors provides a large numerical aperture of 0.9 as well as symmetrical detection of emitting photons. The dielectric thin films and the light-emitting polymers were used to demonstrate the capability of these two modes of NSOM. A comparison between these two different setups is also presented.
authors.forename: P K
authors.initials: PK
authors.lastname: Wei
authors.forename: J H
authors.initials: JH
authors.lastname: Hsu
authors.forename: W S
authors.initials: WS
authors.lastname: Fann
authors.forename: K T
authors.initials: KT
authors.lastname: Tsai