| Budget Amount *help |
¥46,670,000 (Direct Cost: ¥35,900,000、Indirect Cost: ¥10,770,000)
Fiscal Year 2011: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2010: ¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2009: ¥24,570,000 (Direct Cost: ¥18,900,000、Indirect Cost: ¥5,670,000)
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| Research Abstract |
Terahertz quantum-cascade lasers(THz-QCLs) are small-size, narrow line-width, cw and high-power THz laser light sources and are attractive for a lot of applications. We have developed GaN/InAlGaN THz-QCLs by employing a longitudinal-optical(LO) phonon depopulation scheme, for the purpose of achieving undeveloped frequencies, i. e., 5-12 THz. We achieved first observation of spontaneous emission from nitride-based GaN/AlGaN semiconductor superlattices(SLs) intersubband levels by current injection. We confirmed the origin of the THz spontaneous emission by using polarization dependence of emission from the QCL structures.
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