Excess carrier lifetime measurements in indium antimonide using a contactless laser technique

Fedortsov, A. B.; Letenko, D. G.; Churkin, Yu. V.; Savvateev, Vadim

doi:10.1007/bf00224742

Cited by 2 publications

(1 citation statement)

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“…In fact, this cutoff frequency of 10KHz mainly limits the modulation frequency of the laser and the response frequency of the detection system. Theoretically, the carrier lifetime in InSb is 𝜏 = 9 × 10 −9 s [31,38] and the response frequency is potentially up to 100 MHz-1 GHz level. Besides, the pump light extends from visible to the mid-infrared wavelength of 7.29μm due to its narrow bandgap of 0.17eV.…”

Section: Demonstration In the Single-frequency Thz Transmission Systemmentioning

confidence: 99%

Terahertz Nonreciprocal Photonic Spin Manipulation with Light‐Magneto‐Joint Modulation

Wang

Fan

Tan

et al. 2023

Advanced Optical Materials

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Nonreciprocal materials and devices play an irreplaceable role in isolating, routing, and multiplexing. However, in the terahertz (THz) band, their active control mechanisms are still limited. Herein, a THz nonreciprocal photonic spin transmission is demonstrated in the undoped InSb actively manipulated by a light‐magneto‐joint modulation method, in which THz cyclotron resonance of the photoinduced carriers is conjunctively excited by both pump laser and external magnetic field. Moreover, a diffusion model of photoinduced non‐equilibrium carriers and its nonreciprocal dispersion model of magnetized plasma are established to interpret the experimental observation. The results indicate that the light‐magneto‐joint modulation achieves a broadband amplitude‐phase modulation with a higher modulation depth (>2π rad phase shift), as well as an active nonreciprocal spin transmission with magnetic circular dichroism (>20dB) and the Faraday rotation effect (>90°) in InSb, which is more efficient and faster than the traditional thermal excitation. Furthermore, the demonstration in a single‐frequency THz transmission system shows that this light‐magneto‐joint modulation mechanism in InSb can be multifunctionally applied in active control, isolation, and polarization conversion.

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Section: Demonstration In the Single-frequency Thz Transmission Systemmentioning

confidence: 99%