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Spie Press Book

Field Guide to Terahertz Sources, Detectors, and Optics
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Book Description

The region of the electromagnetic spectrum between microwaves and infrared radiation has come to be known as the "THz gap," mainly due to the lack of readily available laboratory sources and detectors. Potential applications, however, particularly in medicine, security, and communications, have led to increased activity by the mainstream physics and engineering community in recent years. The primary objective of this Field Guide to Terahertz Sources, Detectors, and Optics is to provide the reader with a concise description of the quasi-optical techniques used to design THz systems, as well as the basic principles of operation of the most common THz components in use today.

Book Details

Date Published: 21 June 2012
Pages: 144
ISBN: 9780819491671
Volume: FG28

Table of Contents
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Preface
Glossary of Symbols and Acronyms
Introduction
The THz Band
The THz Gap
THz Absorption in Air
Reflection and Transmission
THz Sources
Natural Sources of THz Radiation
THz Generation Techniques
Gunn Diodes
IMPATT Diodes
TUNNETT Diodes
Resonant Tunnel Diodes
Difference Frequency Generation
Electro-optic Crystals (Optical Rectification)
Optical Parametric Oscillators
Frequency Multipliers
Photoconductive Antennas
Photomixing
Optically Pumped Far-IR Gas Lasers
p-Type Germanium Lasers
Quantum Cascade Lasers
Gyrotrons
Synchrotrons
Free-Electron Lasers
Backward Wave Oscillators
Smith–Purcell Emitters
THz Detectors
THz Detection Techniques
Responsivity and Signal-to-Noise Ratio
Noise Equivalent Power
Shot and Thermal Noise
Extrinsic Semiconductor Detectors
Photoconductive Detectors
Photomixers
SIS Mixers
Schottky Diode Mixers
Electro-optic Sampling
Semiconductor Bolometers
Microbolometer Arrays
Transition-Edge Sensors
SQUIDs
Hot-Electron Bolometers
Hot-Electron Bolometer Mixers
Pyroelectric Detectors
Golay Cells
THz Optics
Gaussian Beam Propagation
Complex Radius of Curvature
Gaussian Beam Parameters
Beamwidth
Edge Taper
Truncation and Spillover (Gaussian Beams)
Truncation and Spillover (Non-Gaussian Beams)
Confocal Distance
Far-Field Divergence
Ray Matrices and Gaussian Beam Transformation
Higher-Order Modes (Cylindrical Coordinates)
Higher-Order Modes (Rectangular Coordinates)
Mode Coefficients
Power Coupling Efficiency
Gaussicity
Mismatched Beams and Tolerancing
Scattering Matrix Formulism
Transmission Matrices
Linear Scattering Operators
Truncation at an Aperture
Perfect Lenses and Pure Propagation
Reflections at Dielectric Interfaces (Lens Surfaces)
Standing Waves in Horn-Fed Systems
Cascading Scattering and Transmission Matrices
Off-Axis Mirrors (Ellipsoidal)
Off-Axis Mirrors (Parabolic)
Off-Axis Mirrors (Distortion and Cross-Polarization)
Polarizing Grids
Roof Mirrors as Polarization Rotators
Dual-Beam Interferometers (Tunable Filters)
Diffraction Losses in Interferometers
Diplexers and Multiplexers
Four-Port Dual-Beam Interferometer (Diplexer)
Horn Antenna Feeds
Corrugated Conical Horns (Scalar Feed)
Smooth-Walled Horns (Pyramidal and Diagonal)
Conical Smooth-Walled Horns (Single and Dual Mode)
Shaped Horns and Multimode Feeds
Lens Antennas
System Design
Modeling Techniques
THz Applications
THz Imaging
THz Spectroscopy
THz Time-Domain Spectroscopy
Equation Summary
Bibliography
Index

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