Near-field terahertz probes with room-temperature nanodetectors for subwavelength resolution imaging

Near-field imaging with terahertz (THz) waves is emerging as a powerful technique for fundamental research in photonics and across physical and life sciences. Spatial resolution beyond the diffraction limit can be achieved by collecting THz waves from an object through a small aperture placed in the near-field. However, light transmission through a sub-wavelength size aperture is fundamentally limited by the wave nature of light. Here, we conceive a novel architecture that exploits inherently strong evanescent THz field arising within the aperture to mitigate the problem of vanishing transmission. The sub-wavelength aperture is originally coupled to asymmetric electrodes, which activate the thermo-electric THz detection mechanism in a transistor channel made of flakes of black-phosphorus or InAs nanowires. The proposed novel THz near-field probes enable room-temperature sub-wavelength resolution coherent imaging with a 3.4 THz quantum cascade laser, paving the way to compact and versatile THz imaging systems and promising to bridge the gap in spatial resolution from the nanoscale to the diffraction limit.

[1]  Chi-Kuang Sun,et al.  Performance of THz fiber-scanning near-field microscopy to diagnose breast tumors , 2011, 2011 International Conference on Infrared, Millimeter, and Terahertz Waves.

[2]  Oliver G Schmidt,et al.  Intersublevel spectroscopy on single InAs-quantum dots by terahertz near-field microscopy. , 2012, Nano letters.

[3]  C. J. Bouwkamp,et al.  On Bethe's theory of diffraction by small holes , 1950 .

[4]  F. Xia,et al.  Tunable optical properties of multilayer black phosphorus thin films , 2014, 1404.4030.

[5]  W. Knap,et al.  Efficient Terahertz detection in black-phosphorus nano-transistors with selective and controllable plasma-wave, bolometric and thermoelectric response , 2016, Scientific Reports.

[6]  W. Knap,et al.  One dimensional semiconductor nanostructures: An effective active-material for terahertz detection , 2015 .

[7]  A. Tredicucci,et al.  Tunable Emission in THz Quantum Cascade Lasers , 2011, IEEE Transactions on Terahertz Science and Technology.

[8]  Dominique Coquillat,et al.  Black Phosphorus Terahertz Photodetectors , 2015, Advanced materials.

[9]  H. Bethe.  Theory of Diffraction by Small Holes , 1944 .

[10]  E. Linfield,et al.  Tuning a microcavity-coupled terahertz laser , 2015 .

[11]  Charles S. Adams,et al.  Real-time near-field terahertz imaging with atomic optical fluorescence , 2016, Nature Photonics.

[12]  Atsushi Doi,et al.  Real-Time, Subwavelength Terahertz Imaging , 2013 .

[13]  F. Beltram,et al.  Giant thermovoltage in single InAs nanowire field-effect transistors. , 2013, Nano letters.

[14]  S. Winnerl,et al.  CMOS Integrated Antenna-Coupled Field-Effect Transistors for the Detection of Radiation From 0.2 to 4.3 THz , 2012, IEEE Transactions on Microwave Theory and Techniques.

[15]  W. Knap,et al.  Heterostructured hBN‐BP‐hBN Nanodetectors at Terahertz Frequencies , 2016, Advanced materials.

[16]  Hongkyu Park,et al.  Subsurface nanoimaging by broadband terahertz pulse near-field microscopy. , 2015, Nano letters.

[17]  Igal Brener,et al.  Collection-mode near-field imaging with 0.5-THz pulses , 2001 .

[18]  John L. Reno,et al.  Photoconductive terahertz near-field detector with a hybrid nanoantenna array cavity , 2015 .

[19]  Hanspeter Helm,et al.  Terahertz near-field imaging of electric and magnetic resonances of a planar metamaterial. , 2009, Optics express.

[20]  Koji Ishibashi,et al.  An on-chip near-field terahertz probe and detector , 2008 .

[21]  Lyubov V. Titova,et al.  An ultrafast terahertz scanning tunnelling microscope , 2013, Nature Photonics.

[22]  Jérôme Faist,et al.  Semiconductor nanowires for highly sensitive, room-temperature detection of terahertz quantum cascade laser emission , 2012 .

[23]  XiaoFei Zang,et al.  Excitation of dark multipolar plasmonic resonances at terahertz frequencies , 2016, Scientific Reports.

[24]  Edmund H. Linfield,et al.  Apertureless near-field terahertz imaging using the self-mixing effect in a quantum cascade laser , 2016 .

[25]  Sergey I. Bozhevolnyi,et al.  Detection of internal fields in double-metal terahertz resonators , 2017 .

[26]  Terahertz probe for spectroscopy of sub-wavelength objects. , 2012, Optics express.

[27]  John L. Reno,et al.  Splitting of magnetic dipole modes in anisotropic TiO2 micro‐spheres , 2016 .

[28]  Viktor Krozer,et al.  0.25-$\mu\hbox{m}$ GaN TeraFETs Optimized as THz Power Detectors and Intensity-Gradient Sensors , 2016, IEEE Transactions on Terahertz Science and Technology.

[29]  E. Ash,et al.  Super-resolution Aperture Scanning Microscope , 1972, Nature.

[30]  Mark Lee,et al.  Terahertz pulse propagation through small apertures , 2001 .

[31]  A. Ferrari,et al.  Graphene field-effect transistors as room-temperature terahertz detectors. , 2012, Nature materials.

[32]  Lucia Sorba,et al.  Detection of a 2.8 THz quantum cascade laser with a semiconductor nanowire field-effect transistor coupled to a bow-tie antenna , 2014 .

[33]  R. Myers-Ward,et al.  Epitaxial graphene quantum dots for high-performance terahertz bolometers. , 2015, Nature nanotechnology.

[34]  M. Shur,et al.  Detection, mixing, and frequency multiplication of terahertz radiation by two-dimensional electronic fluid , 1996 .

[35]  J. Aizpurua,et al.  Terahertz near-field nanoscopy of mobile carriers in single semiconductor nanodevices. , 2008, Nano letters.

[36]  Dominique Coquillat,et al.  Room-temperature terahertz detectors based on semiconductor nanowire field-effect transistors. , 2012, Nano letters.

[37]  Phaedon Avouris,et al.  Origin of photoresponse in black phosphorus phototransistors , 2014, 1407.7286.

[38]  Aurèle J. L. Adam,et al.  Review of Near-Field Terahertz Measurement Methods and Their Applications , 2011 .