CuS * CuS. THz. CuS. THz-TDS. CuS. 1 THz = 33 cm - 1. THz. PACS Ci Bd. CuS. THz. THz. CuS. CuS. THz. http / / wulixb. iphy. ac.

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1 Acta Phys Sin Vol 60 No CuS * THz CuS THz CuS Lorentz Durde-Smith THz CuS CuS Lorentz Drude-Smith PACS Ci Bd 1 cm CuS 100 cm THz CuS THz-TDS 1 2 THz-TDS ZnO ZnS CdS PbSe 3 n CuS 1 6 K 15 CuS 5 CuS 1 THz = 33 cm - 1 CuS THz CuS CuS CuS 100 * 09ZY ypyang_cun@ 126 com 2011 Chinese Physical Society http / / wulixb iphy ac cn

2 Acta Phys Sin Vol 60 No H 2 O 200 mg CTAB 100 ml H 2 O CuS 2 CuS X XRD 1 a 2 1 CuS P63 / mm a CTAB = nm c = nm TEM 1 b CuS 171 mg CuCl mg Na 2 S 9H 2 O 100 ml H 2 O 13 nm 1 CuS X a XRD b TEM CuS CuS ZnTe 20 MPa 1 2 mm 1 CuS + PE ZnTe CuS THz THz 2 PE THz 2 2 THz CuS nm 82 MHz 100 fs 760 mw THz ZnTe CBS THz THz 0 3 mm 110 ZnTe

3 Acta Phys Sin Vol 60 No THz Dorney 17 4 n ω κ ω α ω 2 a THz Reference n ω = φ ω c ωd α ω = 2κ ω ω c + 1 1a = 2 d ln 4n ω A ω n ω + 1 1b 2 c d ω A ω φ ω 1024 ^σ = σ r + iσ i σ r = ε 0 ωε i σ i = ε 0 ω 1 - ε r % THz 3 2 CuS FFT 2 b THz THz maxwell-garnett MG 18 Bruggeman BG clausius-mossotti MG 1 2 BG BG α ω n ω Bruggeman a CuS BR THz CuS CuS ε eff ε CuS ε PE n THz ε CuS - ε eff f f ε PE - ε eff = 0 4 ε CuS + 2ε eff ε PE + 2ε eff f CuS CuS 4 CuS CuS 1 3 CuS CuS CuS + PE 2 PE THz ^ε = ε r + iε i ε r = n 2 - κ 2 ε i = 2nκ ps CuS THz CuS 3 b THz

4 Acta Phys Sin Vol 60 No a THz b FFT 3 CuS a b 4 CuS THz Drude- Lorentz Drude-Lorentz 20 ε m ω = ε CuS 5 Lorentz ε m ω = ε + 4 = 3 59 = ω 2 ω 2 p + iγ p ω + Σ j S j ω 2 TOj ω 2 TOj - ω 2 - iγ j ω ω TO /2π = 4 70 ± 0 3 THz Γ /2π = ± 5 ε st ω 2 TO ω 2 TO - ω 2 - iγω 6 ε Drude ω p Γ p 6 ω TO CuS 4 70 THz Lorentz ω TOj Γ j S j CuS 4 43 THz cm - 1 ε 0 5 THz Lorentz CuS THz ε st

5 Acta Phys Sin Vol 60 No THz 4 CuS a CuS b 5 CuS 珟 σ ω = n * e 2 τ / m * THz CuS 1 - iωτ 1 + Σ Drude Drude σ r ω ω = 0 c n Drude 0 σ i ω ω = 0 c 1 σ r = 0 7 Drude c 1 = - 1 σ i c 1 5 CuS σ r σ i c [ n n ] n = iωτ 7 n * m * τ Drude-Smith τ = 64 3 fs c 1 = c 1-1 CuS 13 nm 64 3 fs THz-TDS 5 CuS Drude Drude-Smith Smith 21 CuS 2001 c Drude Lorentz c

6 Acta Phys Sin Vol 60 No CuS Drude-Smith 4 7 THz CuS 64 fs CuS CuS Drude 1 Liu G Schulmeyer T Brotz J Klein A Jaegermann W 2003 Thin Solid Films Chen J Deng S Z Xu N S Wang S Wen X Yang S Yang C Wang J Ge W 2002 Appl Phys Lett Bushkova O V Andreev O L Batalov N N Shkerin S N Kuznetsov M V Tyutyunnik A P Koryakova O V Song E H Chung H J 2002 J Power Source Jin H Hou Y B Tang A W Meng X G Teng F 2006 Chin Phys Lett Zhang W X Wen X G Yang S H 2003 Langmuir Ewen J S Franz G Brett A S Thomas W H 1991 Langmuir Grijalva H Inoue M Boggavarapu S Calvert P 1996 J Mater Chem Artemyev M V Gurin V S Yumashev K V Prokoshin P V Maljarevich A M 1996 J Appl Phys Brelle M C Torres-Martinez G L McNulty J C Mehra R K Zhang J Z 2000 Pure Appl Chem Han J Zhu Z Ray S Azad A K Zhang W He M Li S Zhao Y 2006 Appl Phys Lett Han J Zhang W Chen W Thamizhmani L Azad A K Zhu Z 2006 J Phys Chem B Murphy J E Beard M C Nozik A J 2006 J Phys Chem B 13 Baxter J B Schmuttenmaer C A 2006 J Phys Chem B Xu X Song L Shi Y Yang Y Xie S Wang L 2005 Chem Phys Lett Wang W Z Liu Z Liu Y Xu C Zhang C Wang G 2003 Appl Phys A Chen H Qu Y Peng W X Kuang T Y Li L B 2007 J Appl Phys Dorney T D Bataniuk R G Mittleman D M 2001 J Opt Soc Am A Maxwell - Garnett J C 1906 Philos Trans R Soc Bruggeman D A G 1935 Ann Phys Balkanski M 1972 Optical Properties of Solids New York North - Holland Chap 8 21 Smith N V 2001 Phys Rew B

7 Acta Phys Sin Vol 60 No Optical and electrical properties of CuS nanoparticles in terahertz frequency * Yang Yu-Ping 1 Feng Shuai 1 Feng Hui 2 Pan Xue-Cong 2 Wang Yi-Quan 1 Wang Wen-Zhong 1 1 School of Science Minzu University of China Beijing China 2 Key Laboratory of Optical Physics Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing China Received 8 February 2010 revised manuscript received 20 March 2010 Abstract The spectral response of the mixture composed of CuS nanoparticles and polyethylene powder was measured by the terahertz time - domain spectroscopy THz-TDS The low-frequency optical properties of pure CuS nanoparticles including absorption coefficient complex dielectric constants as well as conductivity were calculated by the effective medium theory The Lorentz theory of dielectric response and the Drude-Smith model of conductivity provide good fits on the measured dielectric function as well as conductivity respectively In addition some terahertz optical properties such as the frequency of the lattice vibration and the time constant for the carrier scattering are also obtained by the fitting Our investigation could help to reveal the material properties in the terahertz range and to find out the promising physical effect for special application Keywords terahertz CuS nanoparticles Lorentz theory Drude-Smith model PACS Ci Bd * Project supported by the Research Foundation of the State Ethnic Affairs Commission of China Grant No 09ZY012 the National Natural Science Foundation of China Grant No and the 985 Project and 211 Project of Ministry of Education of China ypyang_cun@ 126 com