| 000 | 03988nlm1a2200409 4500 | ||
|---|---|---|---|
| 001 | 656495 | ||
| 005 | 20231030041430.0 | ||
| 035 | _a(RuTPU)RU\TPU\network\22936 | ||
| 090 | _a656495 | ||
| 100 | _a20171116a2017 k y0engy50 ba | ||
| 101 | 0 | _aeng | |
| 102 | _aUS | ||
| 135 | _adrcn ---uucaa | ||
| 181 | 0 | _ai | |
| 182 | 0 | _ab | |
| 200 | 1 |
_aEnhancement of spatial resolution of terahertz imaging systems based on terajet generation by dielectric cube _fNguyen Pham Hai Huy [et al.] |
|
| 203 |
_aText _celectronic |
||
| 300 | _aTitle screen | ||
| 320 | _a[References: 38 tit.] | ||
| 330 | _aThe terahertz (THz, 0.1-10 THz) region has been attracting tremendous research interest owing to its potential in practical applications such as biomedical, material inspection, and nondestructive imaging. Those applications require enhancing the spatial resolution at a specific frequency of interest. A variety of resolution-enhancement techniques have been proposed, such as near-field scanning probes, surface plasmons, and aspheric lenses. Here, we demonstrate for the first time that a mesoscale dielectric cube can be exploited as a novel resolution enhancer by simply placing it at the focused imaging point of a continuous wave THz imaging system. The operating principle of this enhancer is based on the generation-by the dielectric cuboid-of the so-called terajet, a photonic jet in the THz region. A subwavelength hotspot is obtained by placing a Teflon cube, with a 1.46 refractive index, at the imaging point of the imagingsystem, regardless of the numerical aperture (NA). The generated terajet at 125 GHz is experimentally characterized, using our unique THz-wave visualization system. The full width at half maximum (FWHM) of the hotspot obtained by placing the enhancer at the focal point of a mirror with a measured NA of 0.55 is approximately 0.55λ, which is even better than the FWHM obtained by a conventional focusing device with the ideal maximum numerical aperture (NA = 1) in air. Nondestructive subwavelength-resolution imaging demonstrations of a Suica integrated circuit card, which is used as a common fare card for trains in Japan, and an aluminum plate with 0.63λ trenches are presented. The amplitude and phase images obtained with the enhancer at 125 GHz can clearly resolve both the air-trenches on the aluminum plate and the card's inner electronic circuitry, whereas the images obtained without the enhancer are blurred because of insufficient resolution. An increase of the image contrast by a factor of 4.4 was also obtained using the enhancer. | ||
| 333 | _aРежим доступа: по договору с организацией-держателем ресурса | ||
| 461 | _tAPL Photonics | ||
| 463 |
_tVol. 2, iss. 5 _v[056106, 9 р.] _d2017 |
||
| 610 | 1 | _aэлектронный ресурс | |
| 610 | 1 | _aтруды учёных ТПУ | |
| 610 | 1 | _aпространственное разрешение | |
| 610 | 1 | _aтерагерцовое излучение | |
| 610 | 1 | _aдиэлектрические материалы | |
| 701 | 0 | _aNguyen Pham Hai Huy | |
| 701 | 1 |
_aHisatake _bSh. _gShintaro |
|
| 701 | 1 |
_aMinin _bO. V. _cphysicist _cprofessor of Tomsk Polytechnic University, Doctor of technical sciences _f1960- _gOleg Vladilenovich _2stltpush _3(RuTPU)RU\TPU\pers\44941 |
|
| 701 | 1 |
_aNagatsuma _bT. _gTadao |
|
| 701 | 1 |
_aMinin _bI. V. _cphysicist _cSenior researcherof Tomsk Polytechnic University, Doctor of technical sciences _f1960- _gIgor Vladilenovich _2stltpush _3(RuTPU)RU\TPU\pers\37571 |
|
| 712 | 0 | 2 |
_aНациональный исследовательский Томский политехнический университет (ТПУ) _bИнститут неразрушающего контроля (ИНК) _bКафедра точного приборостроения (ТПС) _h63 _2stltpush _3(RuTPU)RU\TPU\col\18717 |
| 801 | 2 |
_aRU _b63413507 _c20191030 _gRCR |
|
| 856 | 4 | _uhttps://doi.org/10.1063/1.4983114 | |
| 942 | _cCF | ||