Sub-wavelength mid-infrared imaging of locally driven photocurrents using diamond campanile probes
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| Format: | Preprint |
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2026
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| author | Medapalli, Rajasekhar Cottam, Nathan D. Agarwal, Khushboo Dewes, Benjamin T. Dessmann, Nils Gonzalez-Munoz, Sergio Yan, Wenjing Mišeikis, Vaidotas Kafanov, Sergey Mikhaylovskiy, Rostislav V. Jarvis, Samuel P. Coletti, Camilla Redlich, Britta Patanè, Amalia Kolosov, Oleg V. |
| author_facet | Medapalli, Rajasekhar Cottam, Nathan D. Agarwal, Khushboo Dewes, Benjamin T. Dessmann, Nils Gonzalez-Munoz, Sergio Yan, Wenjing Mišeikis, Vaidotas Kafanov, Sergey Mikhaylovskiy, Rostislav V. Jarvis, Samuel P. Coletti, Camilla Redlich, Britta Patanè, Amalia Kolosov, Oleg V. |
| contents | Precise and high efficiency concentration of mid-infrared (mid-IR) light into sub wavelength volumes is essential for probing low-energy excitations and achieving strong field enhancements, which can be hindered by absorption losses and coupling inefficiencies at long wavelengths. Here, we introduce an innovative diamond-based metal-insulator-metal campanile probe that adiabatically compresses free-space mid infrared light (10 \mum) into \approx 1 \mum domains. Integrated into a scanning photovoltage microscope, the probe enables sub-wavelength mapping of locally driven photocurrents in graphene, resolving polarization dependent and contact-sensitive responses at energies down to \approx 0.1 eV. Experiments reveal a photocurrent signal density enhancement of 10^3 and coupling efficiencies approaching 80%, in agreement with numerical simulations. Operation of the probe with quantum cascade and free electron lasers demonstrates a robust, spectrally tunable platform for high-resolution exploration of low-energy carrier dynamics in atomically thin materials, opening opportunities for mid-IR optoelectronics and quantum photonics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_04318 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Sub-wavelength mid-infrared imaging of locally driven photocurrents using diamond campanile probes Medapalli, Rajasekhar Cottam, Nathan D. Agarwal, Khushboo Dewes, Benjamin T. Dessmann, Nils Gonzalez-Munoz, Sergio Yan, Wenjing Mišeikis, Vaidotas Kafanov, Sergey Mikhaylovskiy, Rostislav V. Jarvis, Samuel P. Coletti, Camilla Redlich, Britta Patanè, Amalia Kolosov, Oleg V. Mesoscale and Nanoscale Physics Instrumentation and Detectors Optics Precise and high efficiency concentration of mid-infrared (mid-IR) light into sub wavelength volumes is essential for probing low-energy excitations and achieving strong field enhancements, which can be hindered by absorption losses and coupling inefficiencies at long wavelengths. Here, we introduce an innovative diamond-based metal-insulator-metal campanile probe that adiabatically compresses free-space mid infrared light (10 \mum) into \approx 1 \mum domains. Integrated into a scanning photovoltage microscope, the probe enables sub-wavelength mapping of locally driven photocurrents in graphene, resolving polarization dependent and contact-sensitive responses at energies down to \approx 0.1 eV. Experiments reveal a photocurrent signal density enhancement of 10^3 and coupling efficiencies approaching 80%, in agreement with numerical simulations. Operation of the probe with quantum cascade and free electron lasers demonstrates a robust, spectrally tunable platform for high-resolution exploration of low-energy carrier dynamics in atomically thin materials, opening opportunities for mid-IR optoelectronics and quantum photonics. |
| title | Sub-wavelength mid-infrared imaging of locally driven photocurrents using diamond campanile probes |
| topic | Mesoscale and Nanoscale Physics Instrumentation and Detectors Optics |
| url | https://arxiv.org/abs/2603.04318 |