Pioneer 2013 Annual Report Download - page 17

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▲
“Resonant Tunneling Diode” module oscillates and detects
terahertz waves (jointly developed with ROHM Co., Ltd.)
Terahertz Imaging
Pioneer is proactively researching and developing an
imaging system that uses terahertz waves. Terahertz
waves are electromagnetic waves that have both the
rectilinear propagation of light and the transmissivity
of radio waves. These unique features can be used to
produce images that cannot be seen with the eye—for
example, the internal composition or cross-section
of an object—without using X-rays. Terahertz wave
imaging technology is seen being used in a wide
range of areas, including quality control in industry,
food and drug, nondestructive inspection of cultural
assets, buildings and structures, and the detection
of dangerous objects in security and medicine.
Pioneer is using optical, miniaturization, and
signal processing technologies cultivated in our
development of optical disc drive pickups to develop
terahertz imaging systems. Working together with
ROHM Co., Ltd., we have successfully developed a
form of terahertz imaging using a small “Resonant
Tunneling Diode” semiconductor device, creating
the possibility of producing small, low-priced imag-
ing systems. We will accelerate our development
of terahertz imaging systems going forward, with
the aim of establishing businesses in the fields of
nondestructive inspection and security.
▲
Demonstration of terahertz wave imaging technology using an opaque plastic case
Open case Closed case Image of case contents in closed case,
produced by terahertz waves
▲
Diagram of terahertz wave concept
Wavelength
(m) 10km 1km 100m 10m 1m 100mm 10mm 1mm 100µm 10µm 1µm 100nm 10nm 1nm
Frequency
(Hz)
Long wave
Medium wave
Shortwave
Very high frequency waves
Ultrahigh frequency waves
Microwaves
Millimeter waves
Sub-millimeter waves
Far-infrared waves
Near- and
mid-infrared waves
Visible light
Ultraviolet light
X-rays
30k
k(103) M(106) T(1012) P(10 15)
300k
100GHz
—
10THz unused frequency range (terahertz waves)
30M 30M 300M 3G 30G
780nm 380nm
300G 3T 30T 300T 3P 30P 300P
Radio waves
Microwaves
Light range (broadly defined)
G(109)
Research and development website: http://pioneer.jp/crdl/
Pioneer Corporation Annual Report 2013
15