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Proposal of an optical modulator based on resonant tunneling and intersubband transitions
KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
KTH, Tidigare Institutioner                               , Fysik.
2001 (engelsk)Inngår i: IEEE Journal of Quantum Electronics, ISSN 0018-9197, E-ISSN 1558-1713, Vol. 37, nr 2, s. 224-230Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We propose and analyze an optical modulator based on intersubband transitions. The absorption is modulated by modulating the carrier density in the ground state of a quantum well (QW). Electrons are injected resonantly into this subband from a QW reservoir subband through a single barrier. When the two states are tuned out of resonance, the electrons are rapidly evacuated by means of the optical held, A waveguide based on surface plasmons is assumed in order to have a high optical mode overlap. Calculations are performed for a cascaded structure with four periods, assuming InGaAs-InAlAs QWs, The considered modulator structure operates at lambda =6.0 mum and is RC limited to 27 GHz, An extinction ratio of it is obtained with a low applied voltage of 0.6 V, At larger applied voltages, the absorption is bistable, Absorption at shorter/longer wavelengths can be obtained by using materials with a larger/smaller conduction band offset. We also assess resonant tunneling from a 2-D electron gas reservoir into an array of quantum dots and compare it to the 2-D-2-D tunneling resonance.

sted, utgiver, år, opplag, sider
2001. Vol. 37, nr 2, s. 224-230
Emneord [en]
intersubband transitions, light modulators, mid-IR, quantum dots, quantum wells, resonant tunneling, quantum-wells, infrared modulator, nonparabolicity, spectroscopy, absorption, devices, shift, stark
Identifikatorer
URN: urn:nbn:se:kth:diva-20386ISI: 000167129200008OAI: oai:DiVA.org:kth-20386DiVA, id: diva2:339081
Merknad
QC 20100525Tilgjengelig fra: 2010-08-10 Laget: 2010-08-10 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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