Researchers at Rice University have developed a sophisticated 3D photonic-crystal cavity that can trap and control light in ...

A new study demonstrates how light-dependent resistors (LDRs) and waveguides enable affordable, real-time optical detection ...

There are ten exam-style questions covering topics such as circuit symbols, atomic structure and distance-time graphs. This activity should take approximately 5-10 minutes to complete. There are ...

A minimal end-to-end optical data‑link demonstration using an Arduino’s red LED as transmitter and a light-dependent resistor (LDR) on analog pin A5 as receiver. Text messages sent over serial are ...