Hi, after completing your B.Sc. you have two very main options to consider. First is finding a job and second is getting a Masters degree or a Postgraduate degree. If you really wish to move into Research department in Technology after completing your B.Sc. plain is what I am assuming. You can choose Masters of Science in any field you like for research. You can not get directly into Research field but you can consider some of the below courses given as a step into Research world. To know if the course is Theory based or Research based, you can check their syllabus for the specific course. In those details are given and also mentioned about what base it is. Some even mention it in the very beginning on the headlines itself.

Master of Science in Physics

Master of Science in Geophysics

Master of Science in Biophysics

Master of Science in Medical Physics

Master of Science in Engineering Physics

Master of Science in Applied Physics

Master of Science in Applied Physics and Ballistics

Master of Science in Marine Geophysics

Master of Science in Astronomy

Master of Science in Astrophysics

Master of Science in Nuclear Physics

You can even take up masters in Computer Science or Information Technology. If you still have doubts feel free to comment. Hope this helps.