Chung Hoang - Academia.edu (original) (raw)

Papers by Chung Hoang

Research paper thumbnail of 7pAD-1 非対称Bow-tie型ナノアンテナのギャップ内表面プラズモン(7pAD フォトニック結晶,領域5(光物性))

Meeting Abstracts of the Physical Society of Japan (Nihon Butsuri Gakkai koen gaiyoshu), 2014

Research paper thumbnail of Figure 2 from: Luong AM, Do QH, Hoang CV, Phan TQ, Nguyen TQ, Pham CT (2022) New records of amphibians from Bac Kan Province, Vietnam. Biodiversity Data Journal 10: e75595. https://doi.org/10.3897/BDJ.10.e75595

Research paper thumbnail of Figure 5 from: Luong AM, Do QH, Hoang CV, Phan TQ, Nguyen TQ, Pham CT (2022) New records of amphibians from Bac Kan Province, Vietnam. Biodiversity Data Journal 10: e75595. https://doi.org/10.3897/BDJ.10.e75595

Research paper thumbnail of New records of amphibians from Bac Kan Province, Vietnam

Biodiversity Data Journal, 2022

Since the establishment of the Nam Xuan Lac Habitat and Species Conservation Area in 2003 in Bac ... more Since the establishment of the Nam Xuan Lac Habitat and Species Conservation Area in 2003 in Bac Kan Province, northern Vietnam, only two herpetological studies have been conducted: One recorded 14 species of amphibians from Ban Thi-Xuan Lac area in 2004 and a recent study reported 32 species of amphibians from this protected area in 2019. As a result of our field surveys in 2020 and 2021, a total of 23 species of amphibians was recorded from the Nam Xuan Lac Habitat and Species Conservation Area. Eight of them are recorded for the first time from Bac Kan Province, comprising one species of Microhylidae, two species of Megophryidae, one species of Dicroglossidae, two species of Ranidae and two species of Rhacophoridae. Besides morphological descriptions, we provide ecological notes of newly-recorded species of amphibians from Bac Kan Province.

Research paper thumbnail of Figure 1 from: Luong AM, Do QH, Hoang CV, Phan TQ, Nguyen TQ, Pham CT (2022) New records of amphibians from Bac Kan Province, Vietnam. Biodiversity Data Journal 10: e75595. https://doi.org/10.3897/BDJ.10.e75595

Research paper thumbnail of Figure 5 In Dna Barcoding Of Vietnamese Bent-Toed Geckos (Squamata: Gekkonidae: Cyrtodactylus) And The Description Of A New Species

FIGURE 5. Holotype of Cyrtodactylus puhuensis sp. nov. Precloacal-femoral area (A), ventral surfa... more FIGURE 5. Holotype of Cyrtodactylus puhuensis sp. nov. Precloacal-femoral area (A), ventral surface of tail (B), and lateral (C), dorsal (D), and ventral (E) views of head.

Research paper thumbnail of Figure 9 In Taxonomic Re-Evaluation Of The Monotypic Genus Pararhabdophis Bourret, 1934 (Squamata: Colubridae: Natricinae) With Discovery Of Its Type Species, P. Chapaensis, From China

FIGURE 9. Habitat of Hebius chapaensis in Daweishan National Nature Reserve, Pingbian County, sou... more FIGURE 9. Habitat of Hebius chapaensis in Daweishan National Nature Reserve, Pingbian County, southern Yunnan Province, China. (A) Microhabitat, showing general view of the dense forest; (B) Microhabitat, showing ephemeral pools with lentic water. Photographs by WK.

Research paper thumbnail of Figure 7 In Taxonomic Re-Evaluation Of The Monotypic Genus Pararhabdophis Bourret, 1934 (Squamata: Colubridae: Natricinae) With Discovery Of Its Type Species, P. Chapaensis, From China

FIGURE 7. General aspect of Hebius chapaensis (YBU 14026; male), showing coloration in life,—Dawe... more FIGURE 7. General aspect of Hebius chapaensis (YBU 14026; male), showing coloration in life,—Daweishan National Nature Reserve, Pingbian County, southern Yunnan Province, China. (A) Lateral view; (B) Ventral view. Photographs by WK.

Research paper thumbnail of Figure 5 In Taxonomic Re-Evaluation Of The Monotypic Genus Pararhabdophis Bourret, 1934 (Squamata: Colubridae: Natricinae) With Discovery Of Its Type Species, P. Chapaensis, From China

FIGURE 5. Comparisons of the pupil shape on both sides of Hebius chapaensis, row 1: left side; ro... more FIGURE 5. Comparisons of the pupil shape on both sides of Hebius chapaensis, row 1: left side; row 2: right side. (A) VNMN 3277; (B) VNMN 06102; (C) VNMN 06105; (D) VNMN 06104; (E) VNMN 06106. Scale bar 1 mm. Photographs by JL.

Research paper thumbnail of Figure 4 In Taxonomic Re-Evaluation Of The Monotypic Genus Pararhabdophis Bourret, 1934 (Squamata: Colubridae: Natricinae) With Discovery Of Its Type Species, P. Chapaensis, From China

FIGURE 4. Comparisons of head scalation and color pattern in different descriptions of Hebius cha... more FIGURE 4. Comparisons of head scalation and color pattern in different descriptions of Hebius chapaensis. (A) Figures from original description (Bourret 1934a); (B) Figures from Bourret (1936); (C) This work (VNMN 3277, Photographs by JL).

Research paper thumbnail of Figure 3 In Taxonomic Re-Evaluation Of The Monotypic Genus Pararhabdophis Bourret, 1934 (Squamata: Colubridae: Natricinae) With Discovery Of Its Type Species, P. Chapaensis, From China

FIGURE 3. The preserved holotype of Hebius chapaensis (MNHN 1938.0125). (A) Body in dorsal view; ... more FIGURE 3. The preserved holotype of Hebius chapaensis (MNHN 1938.0125). (A) Body in dorsal view; (B) Body in ventral view; (C) Head in dorsal view; (D) Head in ventral view; (E) Head in lateral view, left side; (F) Close-up view of ventral anal region. Photographs by Antoine Fraysse (MNHN).

Research paper thumbnail of Mixing amorphous carbon enhanced electrochemical performances of NiCo2O4 nanoparticles as anode materials for sodium-ion batteries

Applied Physics A, 2020

The NiCo 2 O 4 ternary transition metal oxide (NCO) has been received a great interest as anode m... more The NiCo 2 O 4 ternary transition metal oxide (NCO) has been received a great interest as anode material for sodium-ion batteries, recently. Here we show that a composite material composed of NCO nanoparticles (NCO-NPs) and amorphous carbon (NCO/C composite) displayed a superior electrochemical performance over the NCO-NPs. The NCO-NPs delivered a capacity of 172 mAh g −1 at the current density of 50 mA g −1 , and the capacity was reduced to 29 mAh g −1 after 50 cycles. The NCO/C composite showed a capacity of 213 mAh g −1 at 50 mA g −1 ; the capacity was lowered to 119 mAh g −1 after 100 cycles. The capacity of the composite at 100 mA g −1 , 200 mA g −1 and 300 mA g −1 was ca. 123 mAh g −1 , 93 mAh g −1 and 62 mAh g −1 , respectively. This improvement is ascribed to the presence of the activated hard carbon of high electronic conductivity. Our work suggests that the combination of amorphous carbon with the NCO-NPs can serve as anodes for sodium-ion batteries.

Research paper thumbnail of Bio-inspired broadband absorbers induced by copper nanostructures on natural leaves

Scientific Reports, 2020

In this work, two copper-based biometamaterials were engineered using leaves of water cabbage (Pi... more In this work, two copper-based biometamaterials were engineered using leaves of water cabbage (Pistia stratiotes) and purple bauhinia (Phanera purpurea) as templates. The copper sputtering was implemented to produce a thin copper film on the surface of leaves. The scanning electron microscopy (SEM) images exhibited the root hair-like nanostructure of water cabbage leaf and single comb-like nanostructure of purple bauhinia leaf. In spite of copper coating, the leaf surfaces of water cabbage and purple bauhinia were black and exhibited excellent light absorption at visible and near infrarrred wavelengths. It was estimated that these two types of leaves could absorb roughly 90% of light. Finite-difference time-domain (FDTD) calculations predicted the low reflectance stemming from the leaf nanostructures and copper coating layer. Because of the low cost of copper as a coating metal and simple procedure, this can be a promising method for quick fabrication of a thin copper film on the le...

Research paper thumbnail of Metal/Conductive Oxide Plasmonic Structures for Surface-Enhanced Infrared Absorption Spectroscopy

Research paper thumbnail of Dark-Field Scattering and Local SERS Mapping from Plasmonic Aluminum Bowtie Antenna Array

Micromachines, 2019

On the search for the practical plasmonic materials beyond noble metals, aluminum has been emergi... more On the search for the practical plasmonic materials beyond noble metals, aluminum has been emerging as a favorable candidate as it is abundant and offers the possibility of tailoring the plasmonic resonance spanning from ultra-violet to the infrared range. In this letter, in combination with the numerical electromagnetic simulations, we experimentally study the dark-field scattering spectral mapping of plasmonic resonance from the free-standing Al bowtie antenna arrays and correlate their strong nearfield enhancement with the sensing capability by means of surface-enhanced Raman spectroscopy. The spatial matching of plasmonic and Raman mapping puts another step to realize a very promising application of free-standing Al bowtie antennas for plasmonic sensing.

Research paper thumbnail of Taxonomic re-evaluation of the monotypic genus Pararhabdophis Bourret, 1934 (Squamata: Colubridae: Natricinae) with discovery of its type species, P. chapaensis, from China

Zootaxa, Jan 26, 2018

The Asian monotypic genus Pararhabdophis Bourret, 1934 has long been known from a single holotype... more The Asian monotypic genus Pararhabdophis Bourret, 1934 has long been known from a single holotype of the type species Pararhabdophis chapaensis Bourret, 1934 only. The limited available information hampered the identification of the natricine species. On the basis of eight newly collected specimens of P. chapaensis from the type locality in Sa Pa, Lao Cai Province, Vietnam and from Pingbian, Yunnan Province in southwestern China, the taxonomic position of the genus Pararhabdophis was re-evaluated using both morphological and molecular datasets for the first time. Pararhabdophis chapaensis is nested within the genus Hebius Thompson, 1913 with strong support, and morphologically indistinguishable from the latter genus. As a consequence, we herein synonymize the genus Pararhabdophis with Hebius and discuss about the existing paraphyly of some Hebius species. In addition we report Hebius chapaensis for the first time from China and provide redescription and natural history data of this ...

Research paper thumbnail of Electron- and photon-induced plasmonic excitations in two-dimensional silver nanostructures

Applied Physics Letters, 2014

Plasmons are the quasi particles of collective oscillations of electrons and form the basis of pl... more Plasmons are the quasi particles of collective oscillations of electrons and form the basis of plasmonics and optical metamaterials. We combined electron spectroscopy and optical spectroscopy techniques to study plasmons in atomically smooth Ag films and in epitaxial Ag nanodisks to map the momentum-energy dispersion curves of the two-dimensional (2D) sheet plasmon and the quasi-2D plasmons to clarify the essential differences between them. Our experimental results combined with the results of numerical electromagnetic simulations showed that the bulk-like nature of the silver plasmon starts in layers that are only two atoms thick.

Research paper thumbnail of Sub-10 nm, high density titania nanoforests–gold nanoparticles composite for efficient sunlight-driven photocatalysis

Japanese Journal of Applied Physics, 2017

Home Search Collections Journals About Contact us My IOPscience You may also be interested in: Me... more Home Search Collections Journals About Contact us My IOPscience You may also be interested in: Mechanism of strong visible light photocatalysis by Ag2O-nanoparticle-decorated monoclinic TiO2(B) porous nanorods

Research paper thumbnail of Metamaterial-enhanced vibrational absorption spectroscopy for the detection of protein molecules

Scientific reports, Aug 24, 2016

From visible to mid-infrared frequencies, molecular sensing has been a major successful applicati... more From visible to mid-infrared frequencies, molecular sensing has been a major successful application of plasmonics because of the enormous enhancement of the surface electromagnetic nearfield associated with the induced collective motion of surface free carriers excited by the probe light. However, in the lower-energy terahertz (THz) region, sensing by detecting molecular vibrations is still challenging because of low sensitivity, complicated spectral features, and relatively little accumulated knowledge of molecules. Here, we report the use of a micron-scale thin-slab metamaterial (MM) architecture, which functions as an amplifier for enhancing the absorption signal of the THz vibration of an ultrathin adsorbed layer of large organic molecules. We examined bovine serum albumin (BSA) as a prototype large protein molecule and Rhodamine 6G (Rh6G) and 3,3'-diethylthiatricarbocyanine iodide (DTTCI) as examples of small molecules. Among them, our MM significantly magnified only the si...

Research paper thumbnail of Low-energy Plasmons in Ultrathin Silver Structures: a Combination of Electron Energy Loss and Infrared Spectroscopy

Frontiers in Optics 2011/Laser Science XXVII, 2011

ABSTRACT A combination of two approaches: infrared (by use of photon) and electron energy loss (e... more ABSTRACT A combination of two approaches: infrared (by use of photon) and electron energy loss (electron) spectroscopy is presented to show the difference of Ritchie (slab) plasmon and two-dimentional (sheet) plasmon in the silver nanostructure.

Research paper thumbnail of 7pAD-1 非対称Bow-tie型ナノアンテナのギャップ内表面プラズモン(7pAD フォトニック結晶,領域5(光物性))

Meeting Abstracts of the Physical Society of Japan (Nihon Butsuri Gakkai koen gaiyoshu), 2014

Research paper thumbnail of Figure 2 from: Luong AM, Do QH, Hoang CV, Phan TQ, Nguyen TQ, Pham CT (2022) New records of amphibians from Bac Kan Province, Vietnam. Biodiversity Data Journal 10: e75595. https://doi.org/10.3897/BDJ.10.e75595

Research paper thumbnail of Figure 5 from: Luong AM, Do QH, Hoang CV, Phan TQ, Nguyen TQ, Pham CT (2022) New records of amphibians from Bac Kan Province, Vietnam. Biodiversity Data Journal 10: e75595. https://doi.org/10.3897/BDJ.10.e75595

Research paper thumbnail of New records of amphibians from Bac Kan Province, Vietnam

Biodiversity Data Journal, 2022

Since the establishment of the Nam Xuan Lac Habitat and Species Conservation Area in 2003 in Bac ... more Since the establishment of the Nam Xuan Lac Habitat and Species Conservation Area in 2003 in Bac Kan Province, northern Vietnam, only two herpetological studies have been conducted: One recorded 14 species of amphibians from Ban Thi-Xuan Lac area in 2004 and a recent study reported 32 species of amphibians from this protected area in 2019. As a result of our field surveys in 2020 and 2021, a total of 23 species of amphibians was recorded from the Nam Xuan Lac Habitat and Species Conservation Area. Eight of them are recorded for the first time from Bac Kan Province, comprising one species of Microhylidae, two species of Megophryidae, one species of Dicroglossidae, two species of Ranidae and two species of Rhacophoridae. Besides morphological descriptions, we provide ecological notes of newly-recorded species of amphibians from Bac Kan Province.

Research paper thumbnail of Figure 1 from: Luong AM, Do QH, Hoang CV, Phan TQ, Nguyen TQ, Pham CT (2022) New records of amphibians from Bac Kan Province, Vietnam. Biodiversity Data Journal 10: e75595. https://doi.org/10.3897/BDJ.10.e75595

Research paper thumbnail of Figure 5 In Dna Barcoding Of Vietnamese Bent-Toed Geckos (Squamata: Gekkonidae: Cyrtodactylus) And The Description Of A New Species

FIGURE 5. Holotype of Cyrtodactylus puhuensis sp. nov. Precloacal-femoral area (A), ventral surfa... more FIGURE 5. Holotype of Cyrtodactylus puhuensis sp. nov. Precloacal-femoral area (A), ventral surface of tail (B), and lateral (C), dorsal (D), and ventral (E) views of head.

Research paper thumbnail of Figure 9 In Taxonomic Re-Evaluation Of The Monotypic Genus Pararhabdophis Bourret, 1934 (Squamata: Colubridae: Natricinae) With Discovery Of Its Type Species, P. Chapaensis, From China

FIGURE 9. Habitat of Hebius chapaensis in Daweishan National Nature Reserve, Pingbian County, sou... more FIGURE 9. Habitat of Hebius chapaensis in Daweishan National Nature Reserve, Pingbian County, southern Yunnan Province, China. (A) Microhabitat, showing general view of the dense forest; (B) Microhabitat, showing ephemeral pools with lentic water. Photographs by WK.

Research paper thumbnail of Figure 7 In Taxonomic Re-Evaluation Of The Monotypic Genus Pararhabdophis Bourret, 1934 (Squamata: Colubridae: Natricinae) With Discovery Of Its Type Species, P. Chapaensis, From China

FIGURE 7. General aspect of Hebius chapaensis (YBU 14026; male), showing coloration in life,—Dawe... more FIGURE 7. General aspect of Hebius chapaensis (YBU 14026; male), showing coloration in life,—Daweishan National Nature Reserve, Pingbian County, southern Yunnan Province, China. (A) Lateral view; (B) Ventral view. Photographs by WK.

Research paper thumbnail of Figure 5 In Taxonomic Re-Evaluation Of The Monotypic Genus Pararhabdophis Bourret, 1934 (Squamata: Colubridae: Natricinae) With Discovery Of Its Type Species, P. Chapaensis, From China

FIGURE 5. Comparisons of the pupil shape on both sides of Hebius chapaensis, row 1: left side; ro... more FIGURE 5. Comparisons of the pupil shape on both sides of Hebius chapaensis, row 1: left side; row 2: right side. (A) VNMN 3277; (B) VNMN 06102; (C) VNMN 06105; (D) VNMN 06104; (E) VNMN 06106. Scale bar 1 mm. Photographs by JL.

Research paper thumbnail of Figure 4 In Taxonomic Re-Evaluation Of The Monotypic Genus Pararhabdophis Bourret, 1934 (Squamata: Colubridae: Natricinae) With Discovery Of Its Type Species, P. Chapaensis, From China

FIGURE 4. Comparisons of head scalation and color pattern in different descriptions of Hebius cha... more FIGURE 4. Comparisons of head scalation and color pattern in different descriptions of Hebius chapaensis. (A) Figures from original description (Bourret 1934a); (B) Figures from Bourret (1936); (C) This work (VNMN 3277, Photographs by JL).

Research paper thumbnail of Figure 3 In Taxonomic Re-Evaluation Of The Monotypic Genus Pararhabdophis Bourret, 1934 (Squamata: Colubridae: Natricinae) With Discovery Of Its Type Species, P. Chapaensis, From China

FIGURE 3. The preserved holotype of Hebius chapaensis (MNHN 1938.0125). (A) Body in dorsal view; ... more FIGURE 3. The preserved holotype of Hebius chapaensis (MNHN 1938.0125). (A) Body in dorsal view; (B) Body in ventral view; (C) Head in dorsal view; (D) Head in ventral view; (E) Head in lateral view, left side; (F) Close-up view of ventral anal region. Photographs by Antoine Fraysse (MNHN).

Research paper thumbnail of Mixing amorphous carbon enhanced electrochemical performances of NiCo2O4 nanoparticles as anode materials for sodium-ion batteries

Applied Physics A, 2020

The NiCo 2 O 4 ternary transition metal oxide (NCO) has been received a great interest as anode m... more The NiCo 2 O 4 ternary transition metal oxide (NCO) has been received a great interest as anode material for sodium-ion batteries, recently. Here we show that a composite material composed of NCO nanoparticles (NCO-NPs) and amorphous carbon (NCO/C composite) displayed a superior electrochemical performance over the NCO-NPs. The NCO-NPs delivered a capacity of 172 mAh g −1 at the current density of 50 mA g −1 , and the capacity was reduced to 29 mAh g −1 after 50 cycles. The NCO/C composite showed a capacity of 213 mAh g −1 at 50 mA g −1 ; the capacity was lowered to 119 mAh g −1 after 100 cycles. The capacity of the composite at 100 mA g −1 , 200 mA g −1 and 300 mA g −1 was ca. 123 mAh g −1 , 93 mAh g −1 and 62 mAh g −1 , respectively. This improvement is ascribed to the presence of the activated hard carbon of high electronic conductivity. Our work suggests that the combination of amorphous carbon with the NCO-NPs can serve as anodes for sodium-ion batteries.

Research paper thumbnail of Bio-inspired broadband absorbers induced by copper nanostructures on natural leaves

Scientific Reports, 2020

In this work, two copper-based biometamaterials were engineered using leaves of water cabbage (Pi... more In this work, two copper-based biometamaterials were engineered using leaves of water cabbage (Pistia stratiotes) and purple bauhinia (Phanera purpurea) as templates. The copper sputtering was implemented to produce a thin copper film on the surface of leaves. The scanning electron microscopy (SEM) images exhibited the root hair-like nanostructure of water cabbage leaf and single comb-like nanostructure of purple bauhinia leaf. In spite of copper coating, the leaf surfaces of water cabbage and purple bauhinia were black and exhibited excellent light absorption at visible and near infrarrred wavelengths. It was estimated that these two types of leaves could absorb roughly 90% of light. Finite-difference time-domain (FDTD) calculations predicted the low reflectance stemming from the leaf nanostructures and copper coating layer. Because of the low cost of copper as a coating metal and simple procedure, this can be a promising method for quick fabrication of a thin copper film on the le...

Research paper thumbnail of Metal/Conductive Oxide Plasmonic Structures for Surface-Enhanced Infrared Absorption Spectroscopy

Research paper thumbnail of Dark-Field Scattering and Local SERS Mapping from Plasmonic Aluminum Bowtie Antenna Array

Micromachines, 2019

On the search for the practical plasmonic materials beyond noble metals, aluminum has been emergi... more On the search for the practical plasmonic materials beyond noble metals, aluminum has been emerging as a favorable candidate as it is abundant and offers the possibility of tailoring the plasmonic resonance spanning from ultra-violet to the infrared range. In this letter, in combination with the numerical electromagnetic simulations, we experimentally study the dark-field scattering spectral mapping of plasmonic resonance from the free-standing Al bowtie antenna arrays and correlate their strong nearfield enhancement with the sensing capability by means of surface-enhanced Raman spectroscopy. The spatial matching of plasmonic and Raman mapping puts another step to realize a very promising application of free-standing Al bowtie antennas for plasmonic sensing.

Research paper thumbnail of Taxonomic re-evaluation of the monotypic genus Pararhabdophis Bourret, 1934 (Squamata: Colubridae: Natricinae) with discovery of its type species, P. chapaensis, from China

Zootaxa, Jan 26, 2018

The Asian monotypic genus Pararhabdophis Bourret, 1934 has long been known from a single holotype... more The Asian monotypic genus Pararhabdophis Bourret, 1934 has long been known from a single holotype of the type species Pararhabdophis chapaensis Bourret, 1934 only. The limited available information hampered the identification of the natricine species. On the basis of eight newly collected specimens of P. chapaensis from the type locality in Sa Pa, Lao Cai Province, Vietnam and from Pingbian, Yunnan Province in southwestern China, the taxonomic position of the genus Pararhabdophis was re-evaluated using both morphological and molecular datasets for the first time. Pararhabdophis chapaensis is nested within the genus Hebius Thompson, 1913 with strong support, and morphologically indistinguishable from the latter genus. As a consequence, we herein synonymize the genus Pararhabdophis with Hebius and discuss about the existing paraphyly of some Hebius species. In addition we report Hebius chapaensis for the first time from China and provide redescription and natural history data of this ...

Research paper thumbnail of Electron- and photon-induced plasmonic excitations in two-dimensional silver nanostructures

Applied Physics Letters, 2014

Plasmons are the quasi particles of collective oscillations of electrons and form the basis of pl... more Plasmons are the quasi particles of collective oscillations of electrons and form the basis of plasmonics and optical metamaterials. We combined electron spectroscopy and optical spectroscopy techniques to study plasmons in atomically smooth Ag films and in epitaxial Ag nanodisks to map the momentum-energy dispersion curves of the two-dimensional (2D) sheet plasmon and the quasi-2D plasmons to clarify the essential differences between them. Our experimental results combined with the results of numerical electromagnetic simulations showed that the bulk-like nature of the silver plasmon starts in layers that are only two atoms thick.

Research paper thumbnail of Sub-10 nm, high density titania nanoforests–gold nanoparticles composite for efficient sunlight-driven photocatalysis

Japanese Journal of Applied Physics, 2017

Home Search Collections Journals About Contact us My IOPscience You may also be interested in: Me... more Home Search Collections Journals About Contact us My IOPscience You may also be interested in: Mechanism of strong visible light photocatalysis by Ag2O-nanoparticle-decorated monoclinic TiO2(B) porous nanorods

Research paper thumbnail of Metamaterial-enhanced vibrational absorption spectroscopy for the detection of protein molecules

Scientific reports, Aug 24, 2016

From visible to mid-infrared frequencies, molecular sensing has been a major successful applicati... more From visible to mid-infrared frequencies, molecular sensing has been a major successful application of plasmonics because of the enormous enhancement of the surface electromagnetic nearfield associated with the induced collective motion of surface free carriers excited by the probe light. However, in the lower-energy terahertz (THz) region, sensing by detecting molecular vibrations is still challenging because of low sensitivity, complicated spectral features, and relatively little accumulated knowledge of molecules. Here, we report the use of a micron-scale thin-slab metamaterial (MM) architecture, which functions as an amplifier for enhancing the absorption signal of the THz vibration of an ultrathin adsorbed layer of large organic molecules. We examined bovine serum albumin (BSA) as a prototype large protein molecule and Rhodamine 6G (Rh6G) and 3,3'-diethylthiatricarbocyanine iodide (DTTCI) as examples of small molecules. Among them, our MM significantly magnified only the si...

Research paper thumbnail of Low-energy Plasmons in Ultrathin Silver Structures: a Combination of Electron Energy Loss and Infrared Spectroscopy

Frontiers in Optics 2011/Laser Science XXVII, 2011

ABSTRACT A combination of two approaches: infrared (by use of photon) and electron energy loss (e... more ABSTRACT A combination of two approaches: infrared (by use of photon) and electron energy loss (electron) spectroscopy is presented to show the difference of Ritchie (slab) plasmon and two-dimentional (sheet) plasmon in the silver nanostructure.