In this study we have successfully developed the techniques of time-resolved electro-luminescence (EL) and optical beam induced current (OBIC) microscopy for the mapping of photonic devices. We have applied the techniques to examine various photonic devices, including light emitting diodes (LED), organic light emitting diode (OLED), and coplanar waveguide (CPW) devices.
The key development in time-resolved microscopy is the technique of modulation. By measuring the phase delay between the modulation source and the output signal, the response time of the observed devices can be extracted. In electro-luminescence mapping, the phase delay is measured between the applied sinusoidal voltage and the emitted EL, while in OBIC mapping the phase delay is measured between the modulated laser beam and the resulting photocurrent. The phase delay measurements are performed with a lock-in amplifier. In this way, large enhancement in signal-to-noise ratio can also be obtained. Additionally, the technique of varying scanning rate is also developed to synchronize the data acquisition between the LSM and the lock-in amplifier, a key enabling advancement in this thesis study.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0627105-112240 |
| Date | 27 June 2005 |
| Creators | Weng, Peng-Hsiang |
| Contributors | Mei-ying Chang, Tao-yuan Chang, Yi-jen Chiu, Fu-jen Kao, Sheng-lung Huang |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0627105-112240 |
| Rights | campus_withheld, Copyright information available at source archive |
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