Åsa Haglund

Docent at Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Åsa Haglund received the M.Sc. degree in physics from Göteborg University Göteborg, Sweden, in 2000, and the Ph.D. degree in electrical engineering from the Chalmers University of Technology, Göteborg, in 2005.She was engaged in mode and polarization control in vertical-cavity surface-emitting lasers (VCSELs) using surface structures. She is currently an Assistant Professor in the Photonics Laboratory, Chalmers University of Technology. Her current research interests include VCSELs and III-nitride-based light emitters.

Source: chalmers.se

Projects

2014–2019

UV-blue-green resonant light-emitters

Åsa Haglund Photonics
Swedish Foundation for Strategic Research (SSF)

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Publications

2017

Effect of compositional interlayers on the vertical electrical conductivity of Si-doped AlN/GaN distributed Bragg reflectors grown on SiC''

Seyed Ehsan Hashemi, Filip Hjort, Martin Stattin et al
Applied Physics Express. Vol. 10 (5), p. 055501-
Journal article
2017

Electrically conductive ZnO/GaN distributed Bragg reflectors grown by hybrid plasma-assisted molecular beam epitaxy

Filip Hjort, Seyed Ehsan Hashemi, David Adolph et al
Journal of Logic and Computation. Vol. 10104, p. 1010413-1
Paper in proceedings
2017

Multi-wavelength VCSEL arrays using high-contrast gratings

Erik Haglund, Johan Gustavsson, W. V. Sorin et al
Journal of Logic and Computation. Vol. 10113
Paper in proceedings
2017

Thermal lensing effects on lateral leakage in GaN-based vertical-cavity surface-emitting laser cavities

Seyed Ehsan Hashemi, Jörgen Bengtsson, Johan Gustavsson et al
Optics Express. Vol. 25 (9), p. 9556-9568
Journal article
2017

Wavelength Control of VCSELs using High-Contrast Gratings

Erik Haglund, Johan Gustavsson, W. V. Sorin et al
Paper in proceedings
2016

Progress and challenges in electrically pumped GaN-based VCSELs

Åsa Haglund, Seyed Ehsan Hashemi, Jörgen Bengtsson et al
Journal of Logic and Computation. Vol. 9892
Paper in proceedings
2016

GaAs High-Contrast Gratings with InGaP Sacrificial Layer for Multi-Wavelength VCSEL Arrays

Erik Haglund, Johan Gustavsson, W. V. Sorin et al
Conference Digest - IEEE International Semiconductor Laser Conference (ISLC 2016). Vol. TuD2, p. Article n0 7765746-
Paper in proceedings
2016

Demonstration of post-growth wavelength setting of VCSELs using high-contrast gratings

Erik Haglund, Johan Gustavsson, Jörgen Bengtsson et al
Optics Express. Vol. 24 (3), p. 1999-2005
Journal article
2015

Air-suspended TiO2-based HCG reflectors for visible spectral range

Seyed Ehsan Hashemi, Jörgen Bengtsson, Johan Gustavsson et al
Journal of Logic and Computation. Vol. 9372, p. Art. no. 93720D-
Conference contribution
2015

GaN-based VCSELs

Åsa Haglund, Seyed Ehsan Hashemi, Jörgen Bengtsson et al
Paper in proceedings
2015

Demonstration of post-growth wavelength control of VCSELs using high-contrast gratings

Erik Haglund, Johan Gustavsson, Jörgen Bengtsson et al
HP Laboratories Technical Report (70)
Preprint
2015

TiO2 membrane high-contrast grating reflectors for vertical-cavity light-emitters in the visible wavelength regime

Seyed Ehsan Hashemi, Jörgen Bengtsson, Johan Gustavsson et al
Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics. Vol. 33 (5)
Journal article
2015

Integration of GaAs-based VCSEL array on SiN platform with HCG reflectors for WDM applications

Sulakshna Kumari, Johan Gustavsson, R. Wang et al
Journal of Logic and Computation. Vol. 9372, p. Art. no. 93720U-
Paper in proceedings
2014

High-contrast gratings for WDM VCSEL arrays

Erik Haglund, Johan Gustavsson, Åsa Haglund et al
Conference poster
2014

Quasi-single mode VCSELs for longer-reach multimode fiber optical interconnects

Erik Haglund, Rashid Safaisini, Åsa Haglund et al
Conference poster
2014

Pulse transient hot strip technique adapted for slab sample geometry to study anisotropic thermal transport properties of mu m-thin crystalline films

Y. Ma, Johan Gustavsson, Åsa Haglund et al
Review of Scientific Instruments. Vol. 85 (4)
Journal article
2014

Analysis of structurally sensitive loss in GaN-based VCSEL cavities and its effect on modal discrimination

Seyed Ehsan Hashemi, Jörgen Bengtsson, Johan Gustavsson et al
Optics Express. Vol. 22 (1), p. 411-426
Journal article
2014

Triggering of guiding and antiguiding effects in GaN-based VCSELs

Seyed Ehsan Hashemi, Jörgen Bengtsson, Johan Gustavsson et al
Journal of Logic and Computation. Vol. 9001
Conference contribution
2013

High-speed, high-temperature VCSELs for optical interconnects

Johan Gustavsson, Anders Larsson, Åsa Haglund et al
2013 IEEE Photonics Society Summer Topical Meeting Series, PSSTMS 2013, p. 7-8
Paper in proceedings
2013

Engineering the Lateral Optical Guiding in Gallium Nitride (GaN)-based Vertical-Cavity Surface-Emitting Laser (VCSEL) Cavities to Reach the Lowest Threshold Gain

Seyed Ehsan Hashemi, Johan Gustavsson, Jörgen Bengtsson et al
Japanese Journal of Applied Physics. Vol. 52 (8 PART 2), p. 08JG04 -
Journal article
2013

High speed 850nm VCSELs for >40Gb/s transmission

Johan Gustavsson, Anders Larsson, Åsa Haglund et al
2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference, OFC/NFOEC 2013, p. OTh4H.4-
Paper in proceedings
2013

850 nm datacom VCSELs for higher-speed and longer-reach transmission

Erik Haglund, Petter Westbergh, Emanuel Haglund et al
Paper in proceedings
2013

Metal-Free Graphene as Transparent Electrode for GaN-Based Light-Emitters

Martin Stattin, César Javier Lockhart de la Rosa, Jie Sun et al
Japanese Journal of Applied Physics. Vol. 52 (8 PART 2), p. 08JG05-
Journal article
2012

Integrated MEMS-tunable VCSELs for reconfigurable optical interconnects

Benjamin Kögel, P. Debernardi, Petter Westbergh et al
Journal of Logic and Computation. Vol. 8276, p. Article Number: 82760Q-
Paper in proceedings
2012

Graphene as transparent electrode for GaN-based VCSELs

Martin Stattin, César Javier Lockhart de la Rosa, Jie Sun et al
International Workshop on Nitride Semiconductors 2012, October 14-19, 2012, Sapporo, Japan, p. ThP-OD-34-
Conference poster
2012

Engineering the transverse optical guiding in GaN-based VCSELs to avoid detrimental optical loss

Seyed Ehsan Hashemi, Johan Gustavsson, Jörgen Bengtsson et al
Conference poster
2012

Integrated MEMS-Tunable VCSELs Using a Self-Aligned Reflow Process

Benjamin Kögel, P. Debernardi, Petter Westbergh et al
IEEE Journal of Quantum Electronics. Vol. 48 (2), p. 144-152
Journal article
2012

Mode-filtered semiconductor lasers enable longer-reach optical interconnects

Erik Haglund, Åsa Haglund, Petter Westbergh et al
SPIE Newsroom
Magazine article
2012

Impact of photon lifetime on thermal rollover in 850-nm high-speed VCSELs

P. P. Baveja, Benjamin Kögel, Petter Westbergh et al
Journal of Logic and Computation. Vol. 8276
Paper in proceedings
2012

4-PAM for high-speed short-range optical communications

Krzysztof Szczerba, Petter Westbergh, Johnny Karout et al
Journal of Optical Communications and Networking. Vol. 4 (11), p. 885-894
Journal article
2012

Polarization investigation of a tunable high-speed short-wavelength bulk-micromachined MEMS-VCSEL

Hooman A. Davani, Benjamin Kögel, P. Debernardi et al
Journal of Logic and Computation. Vol. 8276, p. Art. no. 82760T-
Paper in proceedings
2012

High-speed lasers for optical interconnects

Erik Haglund, Petter Westbergh, Rashid Safaisini et al
Conference poster
2012

Impact of device parameters on thermal performance of high speed oxide confined 850 nm VCSELs

Prashant Baveja, Benjamin Kögel, Petter Westbergh et al
IEEE Journal of Quantum Electronics. Vol. 48 (1), p. 17-26
Journal article
2012

Direct Chemical Vapor Deposition of Large-Area Carbon Thin Films on Gallium Nitride for Transparent Electrodes: A First Attempt

Jie Sun, M. T. Cole, S. Awais Ahmad et al
IEEE Transactions on Semiconductor Manufacturing. Vol. 25 (3), p. 494-501
Journal article
2012

High-speed tunable and fixed-wavelength VCSELs for short-reach optical links and interconnects

Anders Larsson, Johan Gustavsson, Åsa Haglund et al
Journal of Logic and Computation. Vol. 8276, p. Article Number: 82760H-
Paper in proceedings
2012

Reducing the spectral width of high speed oxide confined VCSELs using an integrated mode filter

Erik Haglund, Åsa Haglund, Johan Gustavsson et al
Journal of Logic and Computation. Vol. 8276, p. Article Number: 82760L-
Paper in proceedings
2012

25 Gbit/s transmission over 500 m multimode fibre using 850 nm VCSEL with integrated mode filter

Erik Haglund, Åsa Haglund, Petter Westbergh et al
Electronics Letters. Vol. 48 (9), p. 517-518
Journal article
2012

High speed VCSELs for optical interconnects

Anders Larsson, Johan Gustavsson, Åsa Haglund et al
Proc. 24th International Conference on Indium Phosphide and Related Materials, p. 269-272
Paper in proceedings
2011

High speed VCSELs for short reach communication

Petter Westbergh, Erik Haglund, Johan Gustavsson et al
Conference contribution
2011

Assessment of VCSEL thermal rollover mechanisms from measurements and empirical modeling

P. P. Baveja, Benjamin Kögel, Petter Westbergh et al
Optics Express. Vol. 19 (16), p. 15490-15505
Journal article
2011

Integrated MEMS-tunable VCSELs with high modulation bandwidth

Benjamin Kögel, Petter Westbergh, Åsa Haglund et al
Electronics Letters. Vol. 47 (13), p. 764-756
Journal article
2011

30 Gbps 4-PAM transmission over 200m of MMF using an 850 nm VCSEL

Krzysztof Szczerba, Petter Westbergh, Johan Gustavsson et al
2011 37th European Conference on Optical Communication (ECOC); 18-22 Sept. 2011; Geneva, p. 1-3
Paper in proceedings
2011

High speed VCSELs for short reach communication

Anders Larsson, Petter Westbergh, Johan Gustavsson et al
Semiconductor Science and Technology. Vol. 26 (1), p. 014017-1-5-
Journal article
2011

Realization of spectrally engineered semiconductor Fabry-Perot lasers with narrow geometrical tolerances

Göran Adolfsson, Jörgen Bengtsson, Åsa Haglund et al
Journal of Applied Physics. Vol. 109 (9), p. 093112-
Journal article
2011

Impact of Photon Lifetime on High-Speed VCSEL Performance

Petter Westbergh, Johan Gustavsson, Benjamin Kögel et al
IEEE Journal on Selected Topics in Quantum Electronics. Vol. 17 (6), p. 1603-1613
Journal article
2011

32 Gb/s multilevel modulation of an 850 nm VCSEL for next-generation datacommunication standards

J.D. Ingham, R. V. Penty, I. H. White et al
2011 Conference on Lasers and Electro-Optics, CLEO 2011; Baltimore, MD; 1 May 2011 through 6 May 2011
Paper in proceedings
2011

Growth of dilute nitrides and 1.3 μm edge emitting lasers on GaAs by MBE

Shu Min Wang, Göran Adolfsson, Huan Zhao Ternehäll et al
Physica Status Solidi (B): Basic Research. Vol. 248 (5), p. 1207-1211
Journal article
2011

Tuneable VCSEL aiming for the application in interconnects and short haul systems

Christian Gierl, Karolina Zogal, Sandro Jatta et al
Journal of Logic and Computation. Vol. 7959
Conference contribution
2011

Higher speed VCSELs by photon lifetime reduction

Petter Westbergh, Johan Gustavsson, Benjamin Kögel et al
Journal of Logic and Computation. Vol. 7952
Conference contribution
2011

Orthogonal multipulse modulation for next-generation datacommunication links

Jonathan D. Ingham, Richard V. Penty, I. H. White et al
Paper in proceedings
2011

Singlemode tunable VCSELs with integrated MEMS technology

Benjamin Kögel, P. Debernardi, Petter Westbergh et al
Paper in proceedings
2011

30 Gbps 4-PAM transmission over 200m of MMF using an 850 nm VCSEL

Krzysztof Szczerba, Petter Westbergh, Johnny Karout et al
Optics Express. Vol. 19 (26), p. B203-B208
Journal article
2011

Low Spectral Width High-Speed VCSELs

Erik Haglund, Åsa Haglund, Petter Westbergh et al
Conference poster
2010

Speed enhancement of VCSELs by photon lifetime reduction

Petter Westbergh, Johan Gustavsson, Benjamin Kögel et al
Electronics Letters. Vol. 46 (13), p. 938-940
Journal article
2010

37 Gbps transmission over 200 m of MMF using single cycle subcarrier modulation and a VCSEL with 20 GHz modulation bandwidth

Krzysztof Szczerba, Bengt-Erik Olsson, Petter Westbergh et al
2010 36th European Conference and Exhibition on Optical Communication (ECOC). Vol. 1-2, p. 1-3
Paper in proceedings
2010

High speed low current density 850 nm VCSELs

Anders Larsson, Petter Westbergh, Johan Gustavsson et al
Journal of Logic and Computation. Vol. 7615, p. 761505-1-11-
Paper in proceedings
2010

Advances in VCSELs for Communication and Sensing

Anders Larsson, Johan Gustavsson, Åsa Haglund et al
22nd IEEE International Semiconductor Laser Conference Digest, p. 4-5
Paper in proceedings
2010

40 Gbit/s error-free operation of oxide-confined 850 nm VCSEL

Petter Westbergh, Johan Gustavsson, Benjamin Kögel et al
Electronics Letters. Vol. 46 (14), p. 1014-1015
Journal article
2010

Integrated Tunable VCSELs With Simple MEMS Technology

Benjamin Kögel, Amin Abbaszadehbanaeiyan, Petter Westbergh et al
Semiconductor Laser Conference (ISLC), 2010 22nd IEEE International
Paper in proceedings
2010

Speed enhancement of VCSELs by photon lifetime reduction

Petter Westbergh, Johan Gustavsson, Benjamin Kögel et al
Electronics Letters. Vol. 46 (13), p. 938-940
Journal article
2010

Active Region Design for High-Speed 850-nm VCSELs

S. B. Healy, E. P. O'Reilly, Johan Gustavsson et al
IEEE Journal of Quantum Electronics. Vol. 46 (4), p. 506-512
Journal article
2010

Mg-doped Al0.85Ga0.15N layers grown by hot-wall MOCVD with low resistivity at room temperature

Anelia Kakanakova-Georgieva, Daniel Nilsson, Martin Stattin et al
Physica Status Solidi - Rapid Research Letetrs. Vol. 4 (11), p. 311-313
Journal article
2010

High-speed 850-nm VCSELs for 40 Gb/s transmission

Johan Gustavsson, Petter Westbergh, Krzysztof Szczerba et al
Journal of Logic and Computation. Vol. 7720
Conference contribution
2010

850 nm VCSEL Operating Error-Free at 40 Gbit/s

Petter Westbergh, Johan Gustavsson, Benjamin Kögel et al
Semiconductor Laser Conference (ISLC), 2010 22nd IEEE International, p. 154 - 155
Paper in proceedings
2009

High speed large aperture 850 nm VCSELs

Petter Westbergh, Johan Gustavsson, Åsa Haglund et al
Conference poster
2009

High speed, low current density 850 nm VCSELs

Petter Westbergh, Johan Gustavsson, Åsa Haglund et al
IEEE Journal on Selected Topics in Quantum Electronics. Vol. 15 (3), p. 694-703
Journal article
2009

Widely tuneable micromachined VCSELs – new results

Peter Meissner, Benjamin Kögel, Katarina Zogal et al
Conference contribution
2009

32 Gbit/s multimode fibre transmission using high-speed, low current density 850 nm VCSEL

Petter Westbergh, Johan Gustavsson, Åsa Haglund et al
Electronics Letters. Vol. 45 (7), p. 366 - 368
Journal article
2009

Short-wavelength tunable VCSELs

Benjamin Kögel, Petter Westbergh, Johan Gustavsson et al
Conference contribution
2009

High speed VCSELs for broadband interconnects

Anders Larsson, Johan Gustavsson, Åsa Haglund et al
Proc. ChinaNANO 2009, Beijing, China, September 2009, p. 51-
Paper in proceedings
2009

Optimized active region design for high speed 850 nm VCSELs

Johan Gustavsson, Sorcha Healy, Petter Westbergh et al
CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference; Munich; Germany; 14 June 2009 through 19 June 2009, p. Art. no. 5192928-
Paper in proceedings
2009

VCSELs for broadband access and interconnects

Anders Larsson, Petter Westbergh, Johan Gustavsson et al
Proc. 2009 International Nano-Optoelectronics Workshop, Stockholm-Berlin, August 2009, p. 87-88
Paper in proceedings
2009

32 Gb/s transmission experiments using high speed 850 nm VCSELs

Petter Westbergh, Johan Gustavsson, Åsa Haglund et al
Conference on Lasers and Electro-Optics (CLEO), p. 1-2
Paper in proceedings
2009

Impedance characteristics and parasitic speed limitations of high speed 850 nm VCSELs

Yiyu Ou, Johan Gustavsson, Petter Westbergh et al
IEEE Photonics Technology Letters. Vol. 21, p. 1840-
Journal article
2009

13 GHz Bandwidth of 1.31 μm GaInNAs Triple Quantum Well Lasers

Huan Zhao Ternehäll, Åsa Haglund, Shu Min Wang et al
Paper in proceedings
2009

A high-speed laser for future data-communication links

Petter Westbergh, Johan Gustavsson, Åsa Haglund et al
Magazine article
2009

A 1.31 μm GaInNAs Triple Quantum Well Laser with 13 GHz Small Signal Modulation Bandwidth

Huan Zhao Ternehäll, Åsa Haglund, Petter Westbergh et al
Electronics Letters. Vol. 45, p. 356-357
Journal article
2009

High speed, low current density 850 nm VCSELs

Petter Westbergh, Johan Gustavsson, Åsa Haglund et al
IEEE Journal on Selected Topics in Quantum Electronics. Vol. 15 (3), p. 694-703
Journal article
2008

Large aperture 850 nm VCSELs operating at bit rates up to 25 Gbit/s

Petter Westbergh, Johan Gustavsson, Åsa Haglund et al
Electronics Letters. Vol. 44 (15), p. 907-908
Journal article
2008

Large aperture 850 nm VCSEL operating at 28 Gbit/s

Petter Westbergh, Johan Gustavsson, Åsa Haglund et al
Semiconductor Laser Conference, 2008. ISLC 2008. IEEE 21st International, p. 7-8
Paper in proceedings
2008

Diffraction loss in long-wavelength buried tunnel junction VCSELs analyzed with a hybrid coupled-cavity transfer-matrix model

Jörgen Bengtsson, Johan Gustavsson, Åsa Haglund et al
Optics Express. Vol. 16 (25), p. 20789-20802
Journal article
2007

Mode and polarization control in VCSELs using shallow surface structures

Johan Gustavsson, Åsa Haglund, Emma Söderberg et al
IET Optoelectronics. Vol. 1 (5), p. 197-205
Journal article
2007

Spatio-temporal turn-on dynamics of grating relief VCSELs

Christian Fuchs, Tobias Gensty, Wolfgang Elsässer et al
IEEE Journal of Quantum Electronics. Vol. 43 (11-12), p. 1227-1234
Journal article
2006

High Frequency Modulation and Bandwidth Limitations of GaInNAs Double Quantum Well Lasers

Yongqiang Wei, Johan Gustavsson, Åsa Haglund
Applied Physics Letters. Vol. 88, p. 051103-
Journal article
2006

WCDMA radio-over-fibre transmission experiment using singlemode VCSEL and multimode fibre

K. A. Persson, C. Carlsson, A. Alping et al
Electronics Letters. Vol. 42 (6), p. 372-374
Journal article
2006

High power single mode VCSELs for emerging applications

Anders Larsson, Johan Gustavsson, Åsa Haglund et al
Paper in proceedings
2006

Design and evaluation of fundamental mode and polarization stabilized VCSELs with a sub-wavelength surface grating

Åsa Haglund, Johan Gustavsson, Jörgen Bengtsson et al
IEEE Journal of Quantum Electronics. Vol. 42 (3), p. 231-240
Journal article
2006

VCSELs for microwave fiber optic links

Anders Larsson, Johan Gustavsson, Peter Modh et al
Paper in proceedings
2005

Dynamic mode stability analysis of single-mode VCSELs using a shallow surface relief

Åsa Haglund, Johan Gustavsson, Peter Modh et al
Paper in proceedings
2005

Efficient and individually controllable mechanisms for mode and polarization selection in VCSELs, based on a common, localized, sub-wavelength surface grating

Johan Gustavsson, Åsa Haglund, Josip Vukusic et al
Optics Express. Vol. 13 (17), p. 6626-6634
Journal article
2005

Efficient and individually controllable mechanisms for mode and polarization selection in VCSELs, based on a common, localized, sub-wavelength surface grating

Johan Gustavsson, Åsa Haglund, Josip Vukusic et al
Optics Express. Vol. 13 (17), p. 6626-6634
Journal article
2005

High-power fundamental-mode and polarization stabilized VCSELs using a sub-wavelength surface grating

Åsa Haglund, Johan Gustavsson, Josip Vukusic et al
Electronics Letters. Vol. 41 (14), p. 37-38
Journal article
2005

Sub-Wavelength Surface Grating Application for High-Power Fundamental-Mode and Polarization Stabilization of the VCSELs

Åsa Haglund, Piotr Jedrasik, Johan Gustavsson et al
Paper in proceedings
2005

High-power single-mode and polarization stabilized VCSELs using a sub-wavelength surface grating

Åsa Haglund, Johan Gustavsson, Josip Vukusic et al
Paper in proceedings
2005

High Frequency Modulation and Bandwidth Limitations of GaInNAs Double Quantum Well Lasers

Yongqiang Wei, Anders Larsson, Johan Gustavsson et al
Paper in proceedings
2005

Dynamic mode stability analysis of surface relief VCSELs under strong RF modulation

Åsa Haglund, Johan Gustavsson, Peter Modh et al
IEEE Photonics Technology Letters. Vol. 17 (8), p. 1602-1604
Journal article
2005

Experimental Study of the Combined Mode and Polarization Control in VCSELs with a Sub-Wavelength Surface Grating

Åsa Haglund, Johan Gustavsson, Piotr Jedrasik et al
Paper in proceedings
2004

Direct high-frequency modulation of VCSELs and applications to fibre optic RF and microwave links

Anders Larsson, Christina Carlsson, Johan Gustavsson et al
New Journal of Physics. Vol. 6, p. 176-
Journal article
2004

Single fundamental mode output power exceeding 6 mW from VCSELs with a shallow surface relief

Åsa Haglund, Johan Gustavsson, Josip Vukusic et al
IEEE Photonic Technology Lettters. Vol. 16 (2), p. 368,370-
Journal article
2004

Dynamic behavior of fundamental-mode stabilized VCSELs using a shallow surface relief

Johan Gustavsson, Åsa Haglund, Jörgen Bengtsson et al
IEEE Journal Quantum Electronics. Vol. 40 (6), p. 607-619
Journal article
2004

Broadband direct modulation of VCSELs and applications in fiber optic RF links

Anders Larsson, Christina Carlsson, Johan Gustavsson et al
Proc IEEE International Conference on Microwave Photonics, p. 251-254
Paper in proceedings