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Chapter 53 Opto Electronic Devices Book Report

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CONTENTS CONTENTS + 0 ) 2 6 - 4 Learning Objectives ➣ Fundamentals of Light ➣ Light Emitting Diode (LED) ➣ Use of LEDs in Facsimile Machines ➣ Liquid Crystal Displays ➣ P-N Junction Photodiode #! OPTOELECTRONIC DEVICES ➣ Dust Sensor ➣ Photoconductive Cell ➣ Phototransistor ➣ Photodarlington ➣ Photo voltaic or Solar Cell ➣ Laser Diode ➣ Optical Disks ➣ Read-only Optical Disk Equipment ➣ Printers Using Laser Diodes ➣ Hologram Scanners ➣ Laser Range Finder ➣ Light-activated SCR(LASCR) ➣ Optical Isolators ➣ Optical Modulators ➣ Optical Fibre Communication Systems ➣ Optical Fibre Data Links CONTENTS CONTENTS Ç Researchers have demonstrated a new type of nanometer scale optoelectronic device that performs addition and other complex logic operations 2088 Electrical Technology 53.1. Fundamentals of Light According to the Quantum Theory, light consists of discrete packets of energy called photons. The energy contained in a photon depends on the frequency of the light and is given by the relation E = hf where h is Plank’s constant (6.625 × 10−34 Joule-second). In this equation, energy E is in Joules and frequency f is in hertz (Hz). As seen, photon energy is directly proportional to frequency: higher the frequency, greater the energy. Now, velocity of light is given by c = fλ where c is the 8 velocity of the light (3 × 10 m/s) and λ is the wavelength of light in metres. The wavelength of light determines its colour in the v ...
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