Oral Presentation
The Fabrications and Simulations of the Terahertz Microlamps
Presenter: Ting-Hang Pei (Academia Sinica)
We design and fabricate several microlamps for generating a flat spectrum in the 30-300 μm THz region. The testing experiments exhibit the relation between the microlamp temperature and heating power, the raising and lowering time constants in the transient state, and the relation between the leg and time constant. In order to understand the thermal conduction mechanism, we also use ANSYS to simulate the performances of our microlamps. Two microlamps of 260 x 260 μm^2 with 4 legs and 1000 x 1000 μm^2 with 8 legs are calculated their temperature distributions and radiation spectra in the working range. Both microlamps have all the same 300 μm legs. Although our simulations show the non-uniform distributions of temperature on the microlamps, the average temperatures of the 260 x 260 μm^2 microlamps are less than 1% errors comparing to the target temperatures. We also comparing the calculation results with experiments and the relation between the temperature and heating power is consistent in calculations and experiment. Therefore, the simulations support the accuracy of our designs and the flatness of the THz spectrum would reach the target. The optimal design is the 260 x 260 μm^2 microlamp at 46.0 K combing with the 1000 x 1000 μm^2 one at 22.8 K. This design give the theoretical ratio of the maximum to minimum in the radiation spectrum to be about 7.0. Our design can theoretically reach the flat spectrum from 30 to 300 μm in the THz region.
asiaa.sinica.edu.tw