Photonics I (A.A. 2014-2015)
The course is intended to provide students with the fundamentals to understand the emission and the detection of optical radiation. The physical principles of light matter interaction and their applications in the most important photonic devices with be extensively treated.
1. Photophysics of semiconductors
Elements of quantum mechanics.
Light-matter interaction: semiclassical theory.
Interaction of an electromagnetic field with a semiconductor.
Time-dependent perturbation theory.
Density matrix formalism.
Bulk semiconductors and Quantum Wells: density of states, selection rules, absorption and gain coefficients.
2. Semiconductor Lasers
Quantum Well Lasers
Distributed Feedback Lasers (DFB)
Vertical Cavity Surface Emitting Laser (VCSEL)
3. Incoherent emitters and displays
Introduction to photometry.
Inorganic and organic Light Emitting Diodes (LED).
Liquid crystals: physical and optical properties.
Liquid crystal displays.
4. Introduction to Radiometry
Definition of radiometric quantities
Theorem of conservation of radiance
Radiance and irradiance of one optical image
5. Radiation detectors
Junction detectors (p-n and p-i-n photodiode, avalanche photodiode)
Charged-Coupled Devices (CCD) and CMOS
Noise in detectors
6. Introduction to quantum optics
Quantization of a single-mode field
Single mode quantum optics:
- the number states and the coherent states
Vacuum fluctuations and zero-point energy:
- the Casimir effect
The assessment will be based on a written test and on an oral exam upon request by the students.