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Secondary Light Emission Generated by Plasmonic Nanostructures May Improve Medical Imaging Technology

By MedImaging International staff writers
Posted on 03 Mar 2014
New clues into light emission at different wavelengths generated by elements known plasmonic nanostructures may help to improve medical imaging technology.

A plasmon is a quantum of plasma oscillation. The plasmon is a quasiparticle resulting from the quantization of plasma oscillations just as photons, and phonons are quantizations of electromagnetic and mechanical vibrations, respectively. Therefore, plasmons are collective oscillations of the free electron gas density, for example, at optical frequencies.

“Plasmonic nanostructures are of great current interest as chemical sensors, in vivo imaging agents, and for photothermal therapeutics,” explained David G. Cahill, a professor and head of the department of materials science and engineering at the University of Illinois at Urbana-Champaign (USA). “Applications in imaging and sensing typically involve the emission of light at a different wavelength than the excitation, or ‘secondary light emission.’ The interpretation of resonant secondary light emission in terms of fundamental processes has been controversial for 40 years. In this work, we point out that resonant electronic Raman scattering and resonant fluorescence may both be useful descriptions of the secondary emission. Better understanding of these principles and their limitations can result in improved biological and medical imaging modalities.”

Fluorescence is a comparatively familiar process by which light of one color or wavelength is absorbed by a material, such as an organic dye or a phosphor, and then light is emitted at a different color after a brief interval of time. In Raman scattering, the wavelength of light is shifted to a different color in an instantaneous scattering event. Raman scattering is not common in everyday life but is a critical tool of analytic chemistry.

“Light emission from plasmonic nanostructures at wavelengths shorter than the wavelength of pulsed laser excitation is typically described as the simultaneous absorption of two photons followed by fluorescence, which is used a lot in biological imaging,” explained Dr. Jingyu Huang, first author of the study, which was published online January 2014 in the journal Proceedings of the National Academy of Sciences of the United States of America (PNAS). “However, we found that by modeling the emission as Raman scattering from electron-hole pairs can predict how the light emission depends on laser power, pulse duration, and wavelength. Since we understand more of the mechanism of this kind of light mission, we can help to design the biological and medical imaging experiments better, and at the same time we can also have more insight into the broad background of surface-enhanced Raman scattering, which is also related to this kind of light emission.”

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92 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (33.855438232422): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (77.009201049805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
105 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
106 (54.121017456055): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294750996 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (549.0779876709): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294750996 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (76.055526733398): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
109 (54.836273193359): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
110 (60.081481933594): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294750996 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (429.86869812012): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294750996 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (612.97416687012): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
113 (405.07316589355): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
114 (95.129013061523): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
115 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
116 (55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
117 (40.769577026367): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
118 (42.915344238281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
119 (40.054321289062): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
120 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
121 (38.862228393555): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
122 (310.89782714844): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 42912.96005249): SELECT * FROM jos_deeppockets WHERE jos_deeppockets.cat = 10 AND jos_deeppockets.type = 'deeppockets_item' AND jos_deeppockets.published = 1 AND jos_deeppockets.created + INTERVAL 14 DAY >= NOW() ORDER BY jos_deeppockets.hits DESC LIMIT 7
124 (622.98774719238): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294750996 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294750996 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 16474.962234497): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
126 (66.995620727539): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
127 (345.94535827637): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
128 (43.153762817383): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
129 (282.04917907715): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
130 (48.160552978516): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
131 (231.02760314941): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
132 (43.869018554688): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
133 (283.95652770996): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
134 (!!!!! 3822.8034973145): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
135 (455.85632324219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (!!!!! 3309.0114593506): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (365.01884460449): SELECT name FROM jos_deeppockets WHERE id=215
138 (38.14697265625): SELECT name FROM jos_deeppockets WHERE id=215
139 (587.94021606445): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (494.95697021484): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (70.095062255859): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
142 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
143 (!!!!! 12778.043746948): TRUNCATE TABLE jos_trademed_module
144 (76.770782470703): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294750996 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (51.021575927734): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294750996 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (906.94427490234): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (51.975250244141): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (!!!!! 2681.0169219971): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
149 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
150 (!!!!! 1083.8508605957): SELECT jos_item.* FROM jos_item INNER JOIN jos_number ON jos_item.numberID=jos_number.id WHERE 1=1 AND (jos_item.imgMini<>'') AND jos_item.type='L' AND jos_item.numberID= ( SELECT jos_number.id FROM jos_number WHERE jos_number.journalID IN (10) and jos_number.id in (select distinct jos_number.id from jos_number join jos_item on jos_item.numberid=jos_number.id where jos_item.type='P') ORDER BY (CONVERT(SUBSTRING(issue,1,2),SIGNED) + (CONVERT(SUBSTRING(issue,3,2),SIGNED)*100)) DESC LIMIT 0,1 ) ORDER BY RAND() DESC LIMIT 6
151 (59.127807617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
152 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
153 (34.809112548828): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294750996 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294750996 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (31.948089599609): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=215 or channel_id is null)
155 (29.087066650391): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=215 or channel_id is null)
156 (31.948089599609): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (60.081481933594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
158 (41.007995605469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750996 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750996 AND published='1' LIMIT 1
159 (!!!!! 2130.0315856934): select jos_twitters.link from jos_twitters where cat=10
160 (49.829483032227): select jos_facebook.link from jos_facebook where cat=10
161 (34.093856811523): select jos_google_plus.link from jos_google_plus where cat=10
162 (30.994415283203): select jos_linkedin.link from jos_linkedin where cat=10
163 (246.04797363281): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14202,14203)
164 (963.92631530762): insert into jos_banners_delta values (14202,'2025-06-23 16:47:55','216.73.216.120','view'),(14203,'2025-06-23 16:47:55','216.73.216.120','view')