Objectives
•
Compare calculated Q with experimental Q for PMMA coated toroidal
devices. In these experiments, I varied the:
• Wavelength (850nm, 980nm)
• Film thickness (0-100nm)
•
I kept the input power very low, toroid geometry consistent
H-S. Choi, 10/2009
Objective 1: 850nm measurements
Increasing film thickness
0 nm
20nm
50nm
Decreasing Q factor
H-S. Choi, 10/2009
Objective 2: 980nm measurements
Increasing film thickness
0 nm
20nm
50nm
100nm
Decreasing Q factor
H-S. Choi, 10/2009
Objective 3: Comparison of theory and experiment
Q theory
The experimental Q always seems to
be nearly same amount below the
theory Q – maybe surface
roughness?
Q theory
H-S. Choi, 10/2009
Next Month
•
•
•
Finish testing PMMA (100nm at 850nm)
Maybe try retesting to reach theory Q?
Look at PS as well, using same experimental parameters (film
thickness, wavelength, toroid size, input power)
H-S. Choi, 10/2009