Details

Autor(en) / Beteiligte

• Schuler, S
• Muench, J E
• Ruocco, A
• Balci, O
• Thourhout, D van
• Sorianello, V
• Romagnoli, M
• Watanabe, K
• Taniguchi, T
• Goykhman, I
• Ferrari, A C
• Mueller, T

Titel

High-responsivity graphene photodetectors integrated on silicon microring resonators

Ist Teil von

• Nature communications, 2021-06, Vol.12 (1), p.3733-3733, Article 3733

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Graphene integrated photonics provides several advantages over conventional Si photonics. Single layer graphene (SLG) enables fast, broadband, and energy-efficient electro-optic modulators, optical switches and photodetectors (GPDs), and is compatible with any optical waveguide. The last major barrier to SLG-based optical receivers lies in the current GPDs' low responsivity when compared to conventional PDs. Here we overcome this by integrating a photo-thermoelectric GPD with a Si microring resonator. Under critical coupling, we achieve >90% light absorption in a ~6 μm SLG channel along a Si waveguide. Cavity-enhanced light-matter interactions cause carriers in SLG to reach ~400 K for an input power ~0.6 mW, resulting in a voltage responsivity ~90 V/W, with a receiver sensitivity enabling our GPDs to operate at a 10 bit-error rate, on par with mature semiconductor technology, but with a natural generation of a voltage, rather than a current, thus removing the need for transimpedance amplification, with a reduction of energy-per-bit, cost, and foot-print.