P.C.M. Planken

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Book chapter (1)

Conference paper (8)

9 records found

THz near-field imaging

Book chapter (2013) - PCM Planken, AJL Adam, D Kim

Low-loss and bendable THz fiber with tailored dispersion

Conference paper (2009) - Kristian Nielsen, Ole Bang, Henrik K. Rasmussen, Auréle J.L. Adam, Paul C.M. Planken, Peter Uhd Jepsen

A polymer THz fiber made of Topas and having a Photonic Crystal Fiber structure is demonstrated. It has low broadband loss and the dispersion of the fiber can be tailored by adjusting the structural parameters. ...

Terahertz near-field measurements of subwavelength antenna structures and metamaterials

Conference paper (2009) - Aurele J.L. Adam, Joseph R. Knab, Lucie A. Guestin, Eric A. Shaner, Paul C.M. Planken

This paper demonstrates broadband THZ near-field measurements performed on different types of antennas and meta materials structures, all having sub-wavelength dimensions. The time and frequency dependence of the electric near-field are presented and compared with numerical calculations. Using terahertz time-domain spectroscopy (THz-TDS), the electric near-field components Ex(t), Ey(t) and Ez(t) in the vicinity of antenna structures for wave vectors k corresponding to kaLt1, kaap1 and ka >1, where a is the typical dimension of the structure. The measurements reveal how the extremity of the wire generates propagating fields resembling a Sommerfeld wave on a cylindrical wire. ...

Near-field imaging of subwavelength circular hole arrays at terahertz frequencies

Conference paper (2008) - J. R. Knab, A. J.L. Adam, M. Nagel, M. A. Seo, D. S. Kim, P. C.M. Planken

Sub-wavelength, metallic circular aperture arrays were studied in the near-field at terahertz frequencies, using terahertz time-domain spectroscopy (THz-TDS). Two different periodicities were investigated and array subsections were imaged in both the time- and frequency-domain. ...

Terahertz vector field microscopic imaging of light emerging from a single slit

Conference paper (2007) - M. A. Seo, D. H. Kang, A. J.L. Adam, P. C.M. Planken, D. S. Kim

A terahertz near-field imaging has been developed, spatiotemporally imaging both the amplitude and phase of the horizontal and vertical components of the electric field vector over the spectral range from 50 GHz to 1.5 THz. ...

Terahertz near-field imaging of subwavelength one-dimensional plasmonic structures

Conference paper (2007) - M. A. Seo, A. J.L. Adam, S. C. Jeoung, Paul C.M. Planken, D. S. Kim

We have developed a terahertz near-field imaging system detecting both amplitude and phase of the electric field spatiotemporally. Imaging one-dimensional slits on metal substrate reveals both propagating and surface-bound waves, strongly dependent on the frequency. ...

Near-field imaging of surface waves for periodic hole arrays

Comparison between metal and absorber

Conference paper (2007) - M. A. Seo, J. W. Lee, A. J.L. Adam, P. C.M. Planken, S. C. Jeoung, D. S. Kim

We compare the near-field imaging of a free standing perforated metal film and a PMMAgraphite composite film with arrays of periodic holes at the terahertz frequency range of from 0.05 THz to 1.65 THz region. ...

Near-field microscopy of THz fields near metal structures

Conference paper (2007) - A. J.L. Adam, J. M. Brok, P. C.M. Planken, M. A. Seo, D. S. Kim

We present measurements and calculations of the THz electric field in the nearfield of sub-wavelength metal structures. ...

Sub-picosecond far-infrared transient-grating measurements of electron cooling in InAs and GaSb

Conference paper (1996) - HPM Pellemans, WT Wenckebach, PCM Planken