RP Photonics logo
RP Photonics
Encyclopedia
Technical consulting services on lasers, nonlinear optics, fiber optics etc.
Profit from the knowledge and experience of a top expert!
Powerful simulation and design software.
Make computer models in order to get a comprehensive understanding of your devices!
Success comes from understanding – be it in science or in industrial development.
The famous Encyclopedia of Laser Physics and Technology – available online for free!
The ideal place for finding suppliers for many photonics products.
Advertisers: Make sure to have your products displayed here!
… combined with a great Buyer's Guide!
VLib part of the
Virtual
Library

Metal–semiconductor–metal Photodetectors

<<<  |  >>>  |  Feedback

Buyer's Guide

The ideal place to find suppliers for photonics products: high-quality information, simple and fast, and respects your privacy!

1 supplier for metal-semiconductor-metal photodetectors is listed.

You are not yet listed? Get your entry!

Acronym: MSM photodetector

Definition: fast photodetector devices based on metal–semiconductor (Schottky) contacts

German: Metall-Halbleiter-Metall-Photodetektoren

Category: photonic devices

How to cite the article; suggest additional literature

A metal–semiconductor–metal photodetector (MSM detector) is a photodetector device containing two Schottky contacts, i.e., two metallic electrodes on a semiconductor material, in contrast to a p–n junction as in a photodiode. During operation, some electric voltage is applied to the electrodes. When light impinges on the semiconductor between the electrodes, it generates electric carriers (electrons and holes), which are collected by the electric field and thus can form a photocurrent.

One normally uses some kind of interdigited electrode structure, where the finger spacing can be as small as 1 μm. The electrode structure can also be ring -shaped, covering an approximately circular area. Light in pinching the device from the side of the electrodes is partially blocked by the electrodes, which of course reduces the quantum efficiency. For higher quantum efficiency, there are back-illuminated devices, where the light impinges from the other side. Another possibility is to use top illumination in combination with extremely thin gold contacts, which are partially transparent. An advantage of top illumination is that the achieved bandwidth is usually higher.

For highest speeds, traveling-wave configurations are used, where the input light is sent through an optical waveguide containing the absorbing layer. The electrodes are deposited on top of the waveguide, forming a coplanar waveguide line for the generated microwave signal.

MSM detectors can be made faster than photodiodes. Their detection bandwidths can reach hundreds of gigahertz (with an impulse response function narrower than 1 ps), making them suitable for very high-speed optical fiber communications.

A practically important aspect is that MSM photodetectors, having a relatively simple planar structure, are particularly suitable for monolithic integration with other components on optoelectronic circuits.

Bibliography

[1]W. C. Koscielniak et al., “Dynamic behavior of photocarriers in a GaAs metal–semiconductor–metal photodetector with sub-half-micron electrode pattern”, Appl. Phys. Lett. 54 (6), 567 (1989)
[2]J. B. D. Soole and H. Schumacher, “InGaAs metal–semiconductor–metal photodetectors for long wavelength optical communications”, IEEE J. Quantum Electron. 27 (3), 737 (1991)
[3]C. Moglestue et al., “Picosecond pulse response characteristics of GaAs metal–semiconductor–metal photodetectors”, J. Appl. Phys. 70 (4), 2435 (1991)
[4]S. Y. Chou et al., “Ultrafast nanoscale metal–semiconductor–metal photodetectors on bulk and low-temperature grown GaAs”, Appl. Phys. Lett. 61 (7), 819 (1992)
[5]J.-W. Shi et al., “Metal–semiconductor–metal traveling-wave photodetectors”, IEEE Photon. Technol. Lett. 13 (6), 623 (2001)

(Suggest additional literature!)

See also: photodetectors, photodiodes, bandwidth

In the RP Photonics Buyer's Guide, 1 supplier for metal-semiconductor-metal photodetectors is listed.

How do you rate this article?

Click here to send us your feedback!

Your general impression: don't know poor satisfactory good excellent
Technical quality: don't know poor satisfactory good excellent
Usefulness: don't know poor satisfactory good excellent
Readability: don't know poor satisfactory good excellent
Comments:

Found any errors? Suggestions for improvements? Do you know a better web page on this topic?

Spam protection: (enter the value of 5 + 8 in this field!)

If you want a response, you may leave your e-mail address in the comments field, or directly send an e-mail.

If you like our website, you may also want to get our newsletters!

If you like this article, share it with your friends and colleagues, e.g. via social media:

arrow

Fiber Optics Software
with Further Improved
User Interface

In RP Fiber Power V6, one can use nice custom forms, which can be
tailored to specific applications.

custom form in RP Fiber Power

Users can make such forms themselves, or get them from RP Photonics within the technical support. The latter is like buying a custom software for every purpose – but without spending a lot of money every time!

Beginners can now get started very easily, even if they need quite special calculations!

– Show all banners –

– Get your own banner! –