It started simply as high frequency microwaves. Then I was advised to look at terahertz frequencies. Now the focus is shifting towards infrared and photonics. Looking at the haphazard way my search for a thesis topic is progressing, I think I will reach gamma rays by the time I give my comprehensive exam
Image credits/sources:
Left half: Rodger Weese Soul-utions
Right half: Si/SiGe Research, Univ of Cambridge
Putting them together: Myself