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CPL emitters and detectors

Present status and what to do list : CPL emitters

1. Electrical helicity switching

[What’s Achieved] 1 kHz switching demonstrated at 10 K with dual-SIE spin-LED.

[Next target] Switching at higher frequency, say 1 MHz and higher.

2. Magnitude of polarization

[What’s achieved] Circular polarization of ~15% at 10 K with a x-AlO_x tunnel barrier.

[Next target] Circular polarization over 15 % and polarization blending at 100 K.

3. Room temperature operation

[What’s achieved] None. This is the critical card in semiconductor spintronics.

[Next target] How to get around with spin relaxation due to phonons ?

4. Towards lasers

[What’s achieved] Collaboration with NAIST.

see e.g., JSAP 2013 Fall meeting, 16p-C15-6 (booklet 10-08)

[Next target] Put Fe/x-AlO_x on top of the real stripe laser structure and test it.

Present status and what to do list : CPL detectors

1. Electrical helicity detection

[What’s achieved] Magnetization-dependent photocurrent obtained using spin-LED structure.

[Next target] Higher output voltage/photocurrent.

2. Magnitude of polarization

[What’s achieved] Demonstration done for fully polarized CPL.

[Next target] Quantitative detection of elliptical polarized light.

3. Room temperature operation

[What’s achieved] Detection of CPL at 300 K !

send us a request for our preprint which will appear in JMSJ (2014) soon.

[Next target] Establish the theory of CPL detection. We do not know why it was easier than CPL emitters.

4. Towards applications

[What’s achieved] None.

[Next target] Measurement of chirality of chemical substances with our CPL emitter and detector.

CPL emitters and detectors