Terahertz-Wave Generation Using Graphene: Toward New Types of Terahertz Lasers

Otsuji, T.; Tombet, Stephane Boubanba; Satou, Akira; Ryzhii, M.; Ryzhii, V.

doi:10.1109/jstqe.2012.2208734

Cited by 72 publications

(29 citation statements)

References 52 publications

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“…Optical and/or injection pumping of graphene can enable negative-dynamic conductivity in the THz spectral range, which may lead to new types of THz lasers [36][37][38][39]. The THz gain in optically pumped graphene has been experimentally confirmed [40,41].…”

Section: Introductionmentioning

confidence: 97%

Terahertz light-emitting graphene-channel transistor toward single-mode lasing

et al. 2018

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Abstract:A distributed feedback dual-gate graphenechannel field-effect transistor (DFB-DG-GFET) was fabricated as a current-injection terahertz (THz) light-emitting laser transistor. We observed a broadband emission in a 1-7.6-THz range with a maximum radiation power of ~10 μW as well as a single-mode emission at 5.2 THz with a radiation power of ~0.1 μW both at 100 K when the carrier injection stays between the lower cutoff and upper cutoff threshold levels. The device also exhibited peculiar nonlinear threshold-like behavior with respect to the current-injection level. The LED-like broadband emission is interpreted as an amplified spontaneous THz emission being transcended to a single-mode lasing. Design constraints on waveguide structures for better THz photon field confinement with higher gain overlapping as well as DFB cavity structures with higher Q factors are also addressed towards intense, single-mode continuous wave THz lasing at room temperature.

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Section: Introductionmentioning

confidence: 97%

Terahertz light-emitting graphene-channel transistor toward single-mode lasing

et al. 2018

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“…First, in a centralized topology, the nanocontroller is responsible for the management of communication among nanonodes. Due to the higher energy budget of the nanocontroller and the need for more efficient usage of [4] and consumption model in [13], [20], [1] Node ID energy on the transmitter side, the receiver-initiated communication model moves the burden of energy consumption for the management of communication and packet handling to the nanocontroller. Furthermore, since it is assumed that there are abundant nanonodes, a significant fraction may not be able to transmit a packet at each time slot.…”

Section: Application Requirementsmentioning

confidence: 99%

“…Energy consumption is modeled as 1 femtojoule for the transmission of each pulse and 0.1 femtojoule for the reception of each pulse [4], [13], [20]. The size of packets is selected based on our previous work [26], where we model and find the optimum packet size for several optimization functions.…”

Section: Performance Evaluationmentioning

confidence: 99%

DRIH-MAC: A Distributed Receiver-Initiated Harvesting-Aware MAC for Nanonetworks

Mohrehkesh

Weigle

Das

2015

IEEE Trans. Mol. Biol. Multi-Scale Commun.

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Abstract-In this paper, we introduce DRIH-MAC, a distributed receiver-initiated medium access control protocol for communication among nanonodes in a wireless electromagnetic nanonetwork. DRIH-MAC is developed based on the following principles: 1) communication starts via the receiver with the goal of maximizing the energy utilization; 2) the distributed scheme for accessing the medium is designed based on graph coloring; and 3) communication scheduling works in coordination with the energy harvesting process. DRIH-MAC is based on a probabilistic scheme to create a scalable and light-weight solution, which minimizes collisions and maximizes the utilization of harvested energy, and can be used in a wide variety of applications. Through simulation experiments, we demonstrate the efficiency of DRIH-MAC in a sample medical monitoring application. In particular, DRIH-MAC can improve energy utilization by 50% as compared to a random MAC protocol. Furthermore, it can satisfy application requirements such as delay, even with low energy harvesting rates.

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“…Non-equilibrium carrier behaviors in optical pumped graphene have been studied theoretically and experimentally, [14][15][16][17][18][19][20][21] which showed population inversion in graphene is possible, and several graphene based terahertz laser concepts have also been proposed. [22][23][24][25] However, due to the ultrafast carrier relaxation dynamics, population inversion in graphene lasts for only a short time, 26,27 signifying a monolayer graphene may be not ideal for a terahertz laser gain material. Recently, graphene heterostructures emerge as new platforms for graphene devices.…”

Section: Introductionmentioning

confidence: 99%

Room temperature broadband terahertz gains in graphene heterostructures based on inter-layer radiative transitions

Tang

Shi

et al. 2014

AIP Advances

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We exploit inter-layer radiative transitions to provide gains to amplify terahertz waves in graphene heterostructures. This is achieved by properly doping graphene sheets and aligning their energy bands so that the processes of stimulated emissions can overwhelm absorptions. We derive an expression for the gain estimation and show the gain is insensitive to temperature variation. Moreover, the gain is broadband and can be strong enough to compensate the free carrier loss, indicating graphene based room temperature terahertz lasers are feasible.

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Terahertz-Wave Generation Using Graphene: Toward New Types of Terahertz Lasers

Cited by 72 publications

References 52 publications

Terahertz light-emitting graphene-channel transistor toward single-mode lasing

Terahertz light-emitting graphene-channel transistor toward single-mode lasing

DRIH-MAC: A Distributed Receiver-Initiated Harvesting-Aware MAC for Nanonetworks

Room temperature broadband terahertz gains in graphene heterostructures based on inter-layer radiative transitions

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