Spatial Terahertz-Light Modulators for Single-Pixel Cameras / written by Rayko Ivanov Stantchev and Emma Pickwell-MacPherson.

Format:

Book

Author/Creator:

Stantchev, Rayko Ivanov, author.

Pickwell-MacPherson, Emma, author.

Language:

English

Subjects (All):

Terahertz spectroscopy.

Physical Description:

1 online resource (202 pages)

Place of Publication:

London : IntechOpen, 2021.

Summary:

Terahertz imaging looks set to become an integral part of future applications from semiconductor quality control to medical diagnosis. This will only become a reality when the technology is sufficiently cheap and capabilities adequate to compete with others. Single-pixel cameras use a spatial light modulator and a detector with no spatial-resolution in their imaging process. The spatial-modulator is key as it imparts a series of encoding masks on the beam and the detector measures the dot product of each mask and the object, thereby allowing computers to recover an image via post-processing. They are inherently slower than parallel-pixel imaging arrays although they are more robust and cheaper, hence are highly applicable to the terahertz regime. This chapter dedicates itself to terahertz single-pixel cameras; their current implementations, future directions and how they compare to other terahertz imaging techniques. We start by outlining the competing imaging techniques, then we discuss the theory behind single-pixel imaging; the main section shows the methods of spatially modulating a terahertz beam; and finally there is a discussion about the future limits of such cameras and the concluding remarks express the authors' vision for the future of single-pixel THz cameras.

Contents:

1. Introduction

2. Single-pixel imaging theory

3. Spatially modulating THz radiation

3.1 Mechanical masks

3.2 THz modulation by charge carrier injection/depletion

3.2.1 Optical modulators

3.2.2 Electrical modulators

3.3 Spatially patterned THz generation

3.4 Liquid crystal THz modulators

4. Applications and discussion

5. Conclusions

Acknowledgments

Conflict of interest

Nomenclature

References.

Notes:

Description based on: online resource; title from PDF information screen (IntechOpen, viewed March 23, 2023).

ISBN:

1-83962-684-4