Frequency-tunable Edge-coupled Membrane Terahertz Photonic Transmitters
Date Issued
2004
Date
2004
Author(s)
Chang, Hsu-Hao
DOI
en-US
Abstract
With the great increase in the amount of the application data, it is clear that the in crease in the data processing speed is necessary. However, the operation speed of the devices fabricated by traditional electrical circuit designs would suffer a bottleneck due to the serious RC time delay when the operation frequency is around hundreds of gigahertz. It will be very hard to make the devices operating at the terahertz regime by the traditional electrical circuit designs. Therefore we design the terahertz photonic transmitters.
A terahertz photonic transmitter is a kind of terahertz emitter with the advantages of tunable operation frequency, room temperature operation, and ease of integrating with other semiconductor devices, such as semiconductor lasers and amplifiers… Therefore we propose and demonstrate a edged-coupled membrane terahertz photonic transmitter in this thesis. The edged-coupled membrane terahertz photonic transmitter consists of a metal-semiconductor-metal traveling-wave photodetector(MSM-TWPD) and a coplanar waveguide (CPW) fed slot antenna. Owing to the ultra-highspeed and high efficiency properties of the MSM-TWPD, we could use an optical pulse with a temporal modulation to excite the photonic transmitter and use a bolometer to detect the power of the radiated terahertz. The photonic transmitter exhibits a record high light-terahertz conversion efficiency of and the external quantum efficiency of 526% at 404.5GHz. By utilizing the Febry-Perot filter, we could get the information of the radiated terahertz wave and do some preliminary survey in the frequency response of the photonic transmitters. This implies the possibility of the design and control of the frequency response of the photonic transmitters in various terahertz applications to achieve certain specific experiments.
In this thesis, we adopt a highspeed photodetector and a slot antenna with a membrane and edge-coupled structure in the photonic transmitters to achieve the tunable operating frequency property and make it possible for our device to be integrated with other semiconductor devices, which would facilitate the terahertz applications in the data processing and biological imaging in the near future.
Subjects
兆赫波發射器
Photonic Transmitter
terahertz
Type
thesis