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Questions and Answers
What is an optoelectronic device?
What is an optoelectronic device?
An electronic technology in which optical radiation is emitted, modified, or converted.
Which of the following is not an optoelectronic device?
Which of the following is not an optoelectronic device?
- Laser Diodes
- Photodiodes
- Resistors (correct)
- Light-Emitting Diodes
Lasers convert electrical energy into optical energy.
Lasers convert electrical energy into optical energy.
True (A)
Define 'photon'.
Define 'photon'.
Electromagnetic spectrum includes radiation of all frequencies or wavelengths, including __________.
Electromagnetic spectrum includes radiation of all frequencies or wavelengths, including __________.
What is 'radiometry'?
What is 'radiometry'?
What determines the phase velocity of electromagnetic waves?
What determines the phase velocity of electromagnetic waves?
Which of the following bands of the electromagnetic spectrum has frequencies between about 10 kHz and 300,000 MHz?
Which of the following bands of the electromagnetic spectrum has frequencies between about 10 kHz and 300,000 MHz?
The quantum energy of electromagnetic radiation can be calculated using the formula __________.
The quantum energy of electromagnetic radiation can be calculated using the formula __________.
How does wavelength relate to frequency?
How does wavelength relate to frequency?
What is optoelectronic technology?
What is optoelectronic technology?
Which of the following is an example of an optoelectronic device?
Which of the following is an example of an optoelectronic device?
A ___ is a quantum of electromagnetic energy with no mass and no charge.
A ___ is a quantum of electromagnetic energy with no mass and no charge.
Electromagnetic radiation includes only visible light.
Electromagnetic radiation includes only visible light.
What is the relationship between wavelength and frequency?
What is the relationship between wavelength and frequency?
Which band of the electromagnetic spectrum has wavelengths between about 1 nm and 10^5 nm?
Which band of the electromagnetic spectrum has wavelengths between about 1 nm and 10^5 nm?
Match the following electromagnetic spectrum divisions with their corresponding wavelength range:
Match the following electromagnetic spectrum divisions with their corresponding wavelength range:
What does the refractive index describe?
What does the refractive index describe?
Study Notes
Optoelectronic Devices
- Combine optics and electronics for applications like fiber optic communications, image processing, and optical sensing.
- Photodiodes convert light to electrical signals, LEDs convert electrical energy to light, and laser diodes emit light in a laser beam.
Photonics and Electronics
- Photonics studies light (photons) and its applications, while electronics deals with electrons and their applications.
Electromagnetic Energy
- Can be described by wavelength (λ), frequency (f), or quantum energy (E_p).
- Travels as waves with a phase velocity (v_p).
- The refractive index (n) of a material affects the speed of light within it.
Electromagnetic Spectrum
- Ranges from electrical power transmission to high-energy rays.
- Includes radio frequency (RF), shortwave, microwave, light, and X-rays.
- Wavelength and frequency are related by λf = c, where c is the speed of light in vacuum.
Light
- Refers to electromagnetic radiation in the ultraviolet, visible, and infrared bands.
- Color in the visible spectrum is determined by wavelength (λ).
- The refractive index (n) affects the effective wavelength and phase velocity of light inside a material.
Optical Spectrum
- Covers a broad range of wavelengths from 1 nm to 10^5 nm.
- Interactions with materials rely on electronic and molecular transitions.
- Subdivided into ultraviolet (UV), visible, and infrared (IR) bands.
Wave-Photon Duality
- Light exhibits both wave-like and quantum behavior.
- Wave model works for most properties, while quantum model is needed for emission, absorption, and laser diodes/photodiodes.
- Quantum energy (E_q) is related to frequency (f) and wavelength (λ) by E_q = hf = hc/λ.
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